CN104022954B

CN104022954B - Message forwarding method and device

Info

Publication number: CN104022954B
Application number: CN201310065280.XA
Authority: CN
Inventors: 秦霞; 宋小恒
Original assignee: New H3C Technologies Co Ltd
Current assignee: New H3C Technologies Co Ltd
Priority date: 2013-03-01
Filing date: 2013-03-01
Publication date: 2017-05-10
Anticipated expiration: 2033-03-01
Also published as: CN104022954A

Abstract

The application discloses a message forwarding method and device, wherein the method includes the following steps: a Spoke ED receives an Ethernet message from a local branch site, searches a corresponding first EVI-Link interface in a branch site forwarding table according to a VLAN identifier and a target MAC address of the received Ethernet message, and encapsulates the received Ethernet message into an EVI message according to the searched first EV-Link interface and sends the EVI message to a main Hub ED, wherein the first EVI-Link interface corresponds to EVI-Link of the main Hub ED connected with the device; and the Spoke ED receives the EVI message from the main Hub ED, de-encapsulates the EVI message into the Ethernet message, searches a corresponding port in a central site forwarding table according to a VLAN identifier and a target MAC address of the de-encapsulated Ethernet message, and sends the Ethernet message to a Spoke CE of the local branch site through the searched port.

Description

Message forwarding method and device

Technical field

The application is related to network communication technology field, more particularly to a kind of message forwarding method and device.

Background technology

In order to realize high reliability and redundant deployment, and preferably service is provided, in most enterprises network and its data The heart or service provider generally dispose multiple data centers in strange land, realize load balancing and high reliability, and realize virtual machine Free migration between data center.Due to the transition process of virtual machine it is transparent to user, it is impossible to change IP（Internet Protocol, Internet Protocol）Address, so must realize that double layer network is interconnected between the data center for being distributed in strange land. Existing double layer network interconnection technique includes：EVI（Ethernet VirtualizationInterconnection, Ethernet Virtual interconnection）And VPLS（Virtual Private LAN Service, Virtual Private LAN Service）.

Wherein, EVI technologies are based on existing service provider（SP）Network and enterprise network, are scattered physical site （That is data center's website）Flexible two layers of interconnecting function is provided.EVI is a kind of advanced " MAC（Media AccessControl, media access control）In IP " technologies, for realizing based on the L2VPN of IP kernel heart net （Layer2VirtualPrivate Network, two-layer virtual private network）Technology.EVI is in data center's website（With Website is referred to as down）Edge device（Edge Device, ED）It is upper to safeguard route and forwarding information, and need not change in website Portion and core network.

As shown in figure 1, employing the network of EVI technologies（Referred to as EVI networks）By core network, website（Site）Network and It is overlapping（Overlay）Network is constituted.It is described below respectively：

Station network is by one or multiple stage edge device（Edge Device, ED）It is connected to the tool of core network There is the double layer network of separate traffic function, generally by unique user tissue, management, control and maintenance, mainly by main frame and exchange Equipment is constituted, and edge device provides the Layer2 switching function between website.

Edge device is the switching equipment of the execution EVI functions at the edge for being located at station network, and it makees in station network side For two-layer equipment operation, run as three-layer equipment in core network side, it completes message slave station spot net to EVI tunnels, with And EVI tunnels are to the mapping and forwarding of station network.Full connection, EVI are set up between edge device in same EVI examples MAC floods in all ED equipment in the EVI examples.

Crossover network is the virtual network set up between the edge device in station network, there is provided two between station network Layer interconnection, realizes extensions of the VLAN between different websites, and in datum plane the Layer 2 data of the VLAN extended between website is carried Stream, in control plane IGP is passed through（Interior Gateway Protocol, Interior Gateway Protocol）Agreement is led between sites Announcement is connected to the All hosts of edge device and the MAC Address reachability information of router, and the interconnection of multiple websites is formed bigger Two layers forwarding domains.In identical EVI network example, by a two-way virtual Gigabit EtherChannel between edge device, i.e., Ethernet virtually interconnects connection EVI-Link（Link）, the data transparent transmission between completing.The EVI-Link is carried on EVI tunnels between edge device, each EVI tunnel can carry multiple EVI-Link.

Core network is the main network for providing interconnection between station network carried by IP routing devices.Core network enters The IP forwardings of row channel message.

The content of the invention

This application provides a kind of message forwarding method and device, to realize the center-branch of double Hub equipment（Hub- Spoke）The message forwarding of the EVI networks of framework.

The technical scheme of the application is as follows：

On the one hand, there is provided a kind of message forwarding method, the method is applied to Spoke ED, the Spoke ED are located at Hub- Branch site in the EVI networks of Spoke frameworks, central site includes：Form two HubED of main and standby relation, the method Including：

Spoke ED receive the ether network packet from local branch site, according to the VLAN of the ether network packet for receiving Mark and target MAC (Media Access Control) address find a corresponding EVI-Link interfaces in branch site forward table, according to what is found The ether network packet for receiving is encapsulated as EVI messages and is sent to primary Hub ED by the first EVI-Link interfaces, wherein, first EVI-Link interfaces connect the EVI-Link of primary Hub ED corresponding to this equipment；

Spoke ED receive the EVI messages from primary Hub ED, and the EVI messages are descapsulated into into ether network packet, root Corresponding end is found in central site forward table according to the VLAN marks and target MAC (Media Access Control) address of the ether network packet after decapsulation Mouthful, the ether network packet is sent to into the Spoke CE of local branch site by the port for finding.

On the other hand, a kind of message forwarding method is additionally provided, the method is applied to constitute two HubED of main and standby relation In any one, two Hub ED of this composition main and standby relation are located at the central site of the EVI networks of Hub-Spoke frameworks, should Method includes：

Hub ED receive the EVI messages of the Spoke ED from a branch site, and the EVI messages for receiving are descapsulated into Ether network packet, according to the VLAN of the ether network packet after decapsulation marks and target MAC (Media Access Control) address in branch site forward table Corresponding port is found, the Hub CE of the ether network packet to central site after decapsulation are sent by the port for finding；

Hub ED receive the ether network packet that Hub CE are returned, according to the VLAN of the ether network packet for receiving marks and purpose MAC Address finds corresponding EVI-Link interfaces in central site forward table, will according to the EVI-Link interfaces for finding The ether network packet for receiving is encapsulated as EVI messages and sends to the SpokeED of other branch sites；

Hub ED detect that this equipment connects the state of the EVI-Link of each Spoke ED, appoint when the connection of this equipment is detected During the EVI-Link failures of one Spoke ED, notify that other Spoke ED this equipment is unavailable, as the EVI- for detecting failure When Link recovers normal, notify that other Spoke ED this equipment recoveries are available.

Another aspect, additionally provides a kind of apparatus for forwarding message, and the apparatus for forwarding message is applied to Spoke ED, should Spoke ED are located at the branch site in the EVI networks of Hub-Spoke frameworks, and central site includes：Form main and standby relation Two Hub ED, the apparatus for forwarding message includes：

Receiver module, for receiving ether network packet and EVI messages；

Processing module, the VLAN marks of the ether network packet for being received according to receiver module exist with target MAC (Media Access Control) address A corresponding EVI-Link interfaces are found in branch site forward table, wherein, an EVI-Link interfaces correspond to this ED Connect the EVI-Link of primary Hub ED；The EVI messages for being additionally operable to receive receiver module are descapsulated into ether network packet, root Corresponding end is found in central site forward table according to the VLAN marks and target MAC (Media Access Control) address of the ether network packet after decapsulation Mouthful；

Sending module, for the EVI-Link interfaces that found according to processing module by receiver module receive with Too network packet is encapsulated as EVI messages and is sent to primary Hub ED；The port for being additionally operable to be found by processing module sends solution Ether network packet after encapsulation；

Memory module, for preserving branch site forward table and central site forward table.

Another aspect, additionally provides a kind of apparatus for forwarding message, and the apparatus for forwarding message is applied to constitute main and standby relation Any one in two Hub ED, two Hub ED of this composition main and standby relation are located in the EVI networks of Hub-Spoke frameworks Center station point, the apparatus for forwarding message includes：

Receiver module, for receiving EVI messages and ether network packet；

Processing module, the EVI messages for receiver module to be received are descapsulated into ether network packet, after decapsulation Ether network packet VLAN mark and target MAC (Media Access Control) address corresponding port is found in branch site forward table；And use Find in central site forward table in the VLAN marks and target MAC (Media Access Control) address of the ether network packet received according to receiver module Corresponding EVI-Link interfaces；

Sending module, the port for being found by processing module sends the ether network packet after decapsulation；And root The ether network packet that the EVI-Link interfaces found according to processing module receive receiver module is encapsulated as EVI messages and sends envelope EVI messages after dress；

Detection module, for detecting that this ED connects the state of the EVI-Link of each Spoke ED；

Notification module, for when detection module detects this ED and connects the EVI-Link failures of any one Spoke ED, Notify that other Spoke ED this ED is unavailable, when the EVI-Link that detection module detects failure recovers normal, notifies other Spoke ED this ED recoveries are available.

The technical scheme of the application, in the EVI networks of the Hub-Spoke frameworks of double Hub equipment, realizes turning for message Send out.

Description of the drawings

Fig. 1 is the network architecture schematic diagram of common EVI networks；

Fig. 2 is the Organization Chart of the EVI networks of the Hub-Spoke frameworks of double Hub equipment of embodiments herein；

Fig. 3 be embodiments herein Hub ED1 be primary Hub ED, Hub ED2 be standby Hub ED when, Spoke The message forwarding process figure that ED1 is performed；

Fig. 4 be embodiments herein Hub ED1 be primary Hub ED, Hub ED2 be standby Hub ED when, Hub The message forwarding process figure that ED1 is performed；

Fig. 5 is that a kind of framework of the EVI networks of the Hub-Spoke frameworks of double Hub equipment of embodiments herein is illustrated Figure；

Fig. 6 is the structural representation of the apparatus for forwarding message of embodiments herein.

Specific embodiment

The following examples of the application provide a kind of message forwarding method and device, can apply to double Hub equipment Hub-Spoke frameworks EVI networks, i.e. two Hub ED and its each connection are included in the central site of the EVI networks Hub CE.

As shown in Fig. 2 the EVI networks of Hub-Spoke frameworks are by a central site（Hub websites）With multiple branch sites （Spoke websites）Constitute.Center edge equipment Hub ED1 and Hub ED2 are the edge devices in Hub websites, central user side Edge equipment Hub CE（Customer Edge, customer edge）1 and Hub CE2 is the customer edge in Hub websites. Branch edge device Spoke ED1 and Spoke ED2 are the edge devices of the local branch site for accessing SpokeED.Branch Customer edge Spoke CE1 and Spoke CE2 is respectively the customer edge in each branch site.

Hub ED1 and Hub ED2 sets up EVI tunnels with Spoke ED1 and Spoke ED2 respectively.Hub ED1 and Hub ED2 is both configured to ENDS（EVI Neighbor Discovery Server, neighbor uni-cast server）, branch site Spoke ED1 and Spoke ED2 are individually configured as ENDC（EVI Neighbor DiscoveryClient, neighbor uni-cast visitor Family end）.As the Hub ED1 and Hub ED2 of ENDS, it is used to safeguard all of neighbor information in same EVI network examples, But ENDS itself is also simultaneously an ENDC.Spoke ED1 and Spoke ED2 coordinates Hub ED1 and Hub ED2 to complete neighbours' Study, with neighbours EVI-Link is set up.SpokeED1 and Spoke ED2 each send respectively to Hub ED1 and Hub ED2 and register Message, to issue same EVI network examples in this equipment as ENDC information.Hub ED1 and Hub ED2 receives Spoke ED1 Learn in EVI network examples the information of ENDC with the logon message of Spoke ED2 and safeguarded, registration reply is sent respectively Message to Spoke ED1 and Spoke ED2, to issue same EVI network examples in this equipment as ENDS information.Thus, Spoke ED1 and Spoke ED2 is each received after registration reply message, each the neighbours with this equipment in EVI network examples Equipment, i.e. Hub ED1 and Hub ED2, set up Ethernet and virtually interconnect connection EVI-Link.Due to Spoke ED1 and Spoke EVI-Link is not set up between ED2, thus the data flow between branch site need to be forwarded by central site, two branch sites it Between do not communicate.

The present embodiment is by with the report in an EVI network example in the EVI networks of the Hub-Spoke frameworks of double Hub equipment Text forwarding is illustrated.The situation that two Hub ED form main and standby relation is described in detail below.

1st, the study of MAC Address, issue and forwarding-table item configuration process

In Fig. 2, for Spoke ED1 and Spoke ED2, the side for connecting local branch site is Spoke sides, in connection The side of center station point is Hub sides；For Hub ED1 and Hub ED2, the side for connecting two branch sites are Spoke sides, connect The side of Hub CE is Hub sides.For example, Hub ED1 are configured（Or specify）For Master（It is primary）Hub ED, Hub ED2 quilts It is configured to Backup（It is standby）Hub ED, after configuration is finished, each Spoke ED are connected with the Hub ED1 as primary Hub ED EVI-Link comes into force, and the EVI-Link that each Spoke ED are connected with the Hub ED2 as standby Hub ED is used as standby, and Do not come into force, only after Hub ED1 are unavailable, just can be activated.Below with Hub ED1 as primary Hub ED, Hub ED2 are standby With illustrating as a example by Hub ED.

（1）The configuration process of the mac learning, issue and forwarding-table item of branch's edge device of branch site

By taking Spoke ED1 as an example, the MAC address learning of the equipment, forwarding-table item are configured and MAC Address is issued and at least included Following steps：

Step S102, Spoke ED1 are by the ether network packet for receiving（Sheet of the ether network packet from Spoke ED1 In ground branch site）VLAN mark and source MAC be configured to the corresponding relation of the port for receiving the ether network packet Central site forward table；Obtain this equipment and connect two Hub ED：The corresponding EVI- of EVI-Link of Hub ED1 and Hub ED2 Link interfaces；By in the two EVI-Link interfaces of the VLAN marks and source MAC of the ether network packet for receiving with acquisition The corresponding relation of an EVI-Link interfaces be configured to branch site forward table, wherein, an EVI-Link interfaces are originally to set The corresponding EVI-Link interfaces of EVI-Link of standby connection Hub ED1；

Step S104, Spoke ED1 generate the MAC Address synchronization message for carrying the VLAN marks and source MAC；Respectively The MAC Address synchronization message of generation is encapsulated as EVI messages and is sent to Hub ED1 by two EVI-Link interfaces according to obtaining With Hub ED2.

By step S102-S104, the Spoke ED1 in branch site are learning the MAC Address in local branch site While, the Hub ED1 and Hub ED2 that the MAC Address can also be respectively synchronized in central site so that Hub ED1 and The MAC Address can also be configured to local central site forward table and branch site forward table by Hub ED2.Wherein, matching somebody with somebody When putting the MAC Address for learning to branch site forward table, Spoke ED1 can only connect the corresponding EVI-Link of the MAC Address Mouth is configured to the corresponding EVI-Link interfaces of EVI-Link that this equipment connects primary Hub ED.

Step S106, Spoke ED1 receive the EVI messages from Hub ED1；

The EVI messages for receiving are descapsulated into MAC Address synchronization message by step S108, Spoke ED1, obtain this equipment The corresponding EVI-Link interfaces of EVI-Link of connection Hub ED1；

Step S110, VLAN marks and MAC Address that Spoke ED1 carry the MAC Address synchronization message after decapsulation Branch site forward table is configured to the corresponding relation of the EVI-Link interfaces obtained in step S108.

Due to Spoke ED can by the MAC Address for learning while be synchronized to Hub ED1 and Hub ED2, therefore, Spoke ED1 can receive the MAC Address synchronization message that Hub ED1 send, and can also receive the MAC Address that Hub ED2 send and synchronously disappear Breath, but, Spoke ED1 judge it is from standby Hub after the MAC Address synchronization message that Hub ED2 send is received The MAC Address synchronization message of ED, then obtain the corresponding EVI-Link interfaces of EVI-Link that this equipment connects Hub ED2, preserves The EVI-Link interfaces of acquisition, but it is not carried out above-mentioned configuration operation.That is, Spoke ED1 are only receiving primary Hub After the MAC Address synchronization message that ED sends, MAC Address therein just can be connected the EVI-Link of primary Hub ED with this equipment The corresponding relation of corresponding EVI-Link interfaces is configured to branch site forward table.

VLAN marks and broadcast MAC address are connected step S112, Spoke ED1 the EVI- of Hub ED1 with this equipment The corresponding relation of the corresponding EVI-Link interfaces of Link is configured to branch site forward table；VLAN is identified and is broadcasted MAC Address is connected the corresponding relation of the port of the Spoke CE of local branch site with this equipment and is configured to central site forward table.

By step S112, Spoke ED1 can match somebody with somebody in local branch site forward table and central site forward table Broadcast MAC address is put, also, in branch site forward table, the corresponding EVI-Link interfaces of broadcast MAC address are this equipment company Connect the EVI-Link interfaces of the EVI-Link of primary Hub ED.

In step S102, the order of Spoke ED1 configuration center site forwarding tables and branch site forward table is unrestricted System.In step S108, Spoke ED1 can executed in parallel EVI message decapsulation process and acquisition EVI-Link interface process.

（2）The MAC address learning of the center edge equipment of central site, issue and forwarding-table item configuration process

By taking Hub ED1 as an example, the MAC address learning of the equipment, forwarding-table item configuration and MAC Address issue at least include with Lower step：

Step S202, Hub ED1 receive the EVI messages that Spoke ED1 send；

The EVI messages for receiving are descapsulated into MAC Address synchronization message by step S204, Hub ED1, obtain the connection of this equipment The corresponding EVI-Link interfaces of EVI-Link of Spoke ED1；

Step S206, Hub ED1 identify the VLAN carried in the MAC Address synchronization message and MAC Address and acquisition The corresponding relation of the corresponding EVI-Link interfaces of EVI-Link of connection Spoke ED1, is configured to central site forward table；Should The corresponding relation of the port that the VLAN marks carried in MAC Address synchronization message and MAC Address are connected Hub CE1 with this equipment is matched somebody with somebody It is placed in branch site forward table.

By step S202-S206, Hub ED1 can match somebody with somebody the MAC Address that the Spoke ED1 in branch site synchronously come Put local branch site forward table and central site forward table.

Step S208, Hub ED1 obtain the corresponding EVI-Link interfaces of EVI-Link that this equipment connects Spoke ED2, MAC Address synchronization message after decapsulation is Resealed and is transmitted to Spoke ED2.

By step S208, Hub ED1 are receiving the Spoke ED of a branch site：What Spoke ED1 synchronously came After MAC Address, also the MAC Address can be continued to be synchronized to the Spoke ED of other branch sites：SpokeED2.

Spoke ED2 are received after the EVI messages of Hub ED1, and the process of execution is identical with step S108 and S110.

Step S210, Hub ED1 identify VLAN and broadcast MAC address is connected each branch site with this equipment The corresponding relation of the corresponding EVI-Link interfaces of EVI-Link of Spoke ED, is configured at central site forward table；VLAN is marked Knowledge and broadcast MAC address are connected the corresponding relation of the port of Hub CE1 with this equipment, are configured at branch site forward table.

By step S210, Hub ED1 can be configured in local branch site forward table and central site forward table Broadcast MAC address.

2nd, message repeating process

（1）The message repeating process of branch's edge device of branch site

The explanation by taking the process that Spoke ED1 E-Packet as an example below：

As shown in figure 3, the message repeating process of Spoke ED1 is comprised the following steps：

Step S302, Spoke ED1 receive the ether network packet from local branch site；

For example, the ether network packet that the Spoke CE1 forwardings of local branch site come is received.

Step S304, Spoke ED1 are according to the VLAN of the ether network packet for receiving marks and target MAC (Media Access Control) address in branch A corresponding EVI-Link interfaces are found in site forwarding table, wherein, the EVI-Link interfaces for finding are Spoke ED1 is connected to the outgoing interface of the EVI-Link of Hub ED1, i.e. the EVI-Link that Spoke ED1 connect primary Hub ED is corresponding EVI-Link interfaces, then, EVI reports are encapsulated as according to the EVI-Link interfaces for finding by the ether network packet for receiving Text is simultaneously sent to Hub ED1；

Step S306, Spoke ED1 receive the EVI messages from Hub ED1；

The EVI messages are descapsulated into ether network packet by step S308, Spoke ED1, according to the Ethernet after decapsulation The VLAN marks of message and target MAC (Media Access Control) address find corresponding port in central site forward table；

For example, the port for finding is the port that the Spoke ED1 are connected to Spoke CE1.

The ether network packet is sent to Spoke CE1 by step S310, Spoke ED1 by the port for finding.

Spoke CE1 can be according to the target MAC (Media Access Control) address of the ether network packet for receiving, and forwarding ether network packet is to corresponding master Machine.

（2）The message repeating process of the center edge equipment of central site

Due to now, Hub ED1 are primary Hub ED, only Hub ED1 can just receive that each Spoke ED send by The EVI messages that ether network packet is packaged into, as shown in figure 4, the process for E-Packeting of Hub ED1 is comprised the following steps：

Step S402, Hub ED1 receive the EVI messages from Spoke ED1；

Ether network packet in local branch site is packaged into EVI messages and is transmitted to the tool of Hub ED1 by Spoke ED1 Body process, may refer to above-mentioned steps S302-S304, repeat no more here.

The EVI messages for receiving deblocking is dressed up and Hub CE1 is forwarded to after Ethernet message by step S404, Hub ED1.

Specifically, the EVI messages are descapsulated into ether network packet by Hub ED1 after EVI messages are received, and are being divided VLAN marks and the port of target MAC (Media Access Control) address searched in site forwarding table corresponding to the ether network packet is propped up, wherein, find Port be that Hub ED1 are connected to the port of Hub CE1, then, the ether network packet is sent to by the port for finding Hub CE1.Hub CE1 after the ether network packet is received, can be managed as data stream management device to message, Afterwards, the ether network packet is intactly returned to into Hub ED1.

Step S406, Hub ED1 are received after the ether network packet of Hub CE1 returns, in central site forward table Find the VLAN marks and the EVI-Link interfaces of target MAC (Media Access Control) address corresponding to the ether network packet, for example, what this found EVI-Link interfaces are connected to the EVI-Link of Spoke ED2 corresponding to Hub ED1, therefore, HubED1 is according to finding EVI-Link interfaces are encapsulated as the ether network packet to be transmitted to SpokeED2 after EVI messages.

Spoke ED2 may refer to above-mentioned steps S306-S310 in the processing procedure for receiving the EVI messages and forward, Here repeat no more.

3rd, situation when primary Hub ED are unavailable

It is unavailable including two kinds of situations as the Hub ED1 of primary Hub ED：One kind is Hub ED1 failures, and another kind is Some EVI-Link failure of Hub ED1 connections, the application is not limited this.Hub ED1 there occurs after failure, each Spoke ED can connect the EVI-Link down of Hub ED1 by detecting this equipment（Failure）To know that Hub ED1 can not With；If an EVI-Link failure of Hub ED1 connections, for example, the EVI-Link failures being connected with SpokeED1, this When, Hub ED1 can pass through other EVI Link of connection to other SpokeED：Spoke ED2 send down state and notify Message, so, Spoke ED1 can know Hub ED1 not by detecting this equipment with the EVI-Link down of Hub ED1 Can use, Spoke ED2 can know that Hub ED1 are unavailable by down state notification message.

（1）The configuration modification process of the mac learning, issue and forwarding-table item of branch's edge device of branch site

Situation one：In the case of Hub ED1 failures：

In the situation once, by taking Spoke ED1 as an example, the MAC address learning of the equipment, forwarding-table item configuration modification and MAC Address is issued and at least comprised the following steps：

Step S502, Spoke ED1 detect the state of the EVI-Link of this equipment connection Hub ED1 and Hub ED2；In inspection When measuring the EVI-Link failures of connection Hub ED1, Spoke ED1 are by the EVI-Link interfaces in branch site forward table The 2nd EVI-Link interfaces are revised as, wherein, the 2nd EVI-Link interfaces are the EVI-Link correspondences of this equipment connection HubED2 EVI-Link interfaces.

Because Spoke ED1 are after the MAC Address synchronization message sent as the Hub ED2 of standby Hub ED is received, Can obtain and preserve the corresponding 2nd EVI-Link interfaces of EVI-Link that this equipment connects Hub ED2.Therefore, Spoke ED1 After knowing that Hub ED1 are unavailable, the 2nd EVI-Link interfaces of preservation can be obtained, by each MAC in branch site forward table The corresponding EVI-Link interfaces in address are revised as the 2nd EVI-Link interfaces, and now, this equipment connects the EVI- of Hub ED2 Link is activated.

Step S504, Spoke ED1 are by the ether network packet for receiving（The ether network packet is from the local of Spoke ED1 In branch site）VLAN mark and source MAC and the corresponding relation of the port for receiving the ether network packet, be configured at center Site forwarding table；Obtain this equipment connect Hub ED2 the corresponding 2nd EVI-Link interfaces of EVI-Link, will receive with The VLAN marks and source MAC of too network packet is configured to the branch with the corresponding relation of the 2nd EVI-Link interfaces for obtaining Site forwarding table；

Now, because Hub ED1 are unavailable, the MAC Address for learning is configured to branch site by Spoke ED1 During forward table, the corresponding EVI-Link interfaces of the MAC Address can be set to the EVI-Link correspondences of this equipment connection Hub ED2 EVI-Link interfaces, i.e. the 2nd EVI-Link interfaces.

Step S506, Spoke ED1 generate the MAC Address synchronization message for carrying the VLAN marks and source MAC, according to The MAC Address synchronization message of generation is encapsulated as EVI messages and is sent to Hub ED2 by the 2nd EVI-Link interfaces.

Due to Hub ED1 failures, by above-mentioned step S502-S506, detecting this equipment connection Hub ED1's After EVI-Link failures, this equipment in branch site forward table can be connected Spoke ED1 the EVI-Link correspondences of Hub ED1 EVI-Link interfaces be revised as this equipment connect Hub ED2 the corresponding EVI-Link interfaces of EVI-Link, and, study To after MAC Address, only can be by the right of MAC Address EVI-Link interfaces corresponding with the EVI-Link that this equipment connects HubED2 Should be related to and be configured to branch site forward table, and only the MAC Address is synchronized to into Hub ED2.

Step S508, Spoke ED1 receive the EVI messages from Hub ED2；

The EVI messages from Hub ED2 for receiving are descapsulated into MAC Address and are synchronously disappeared by step S510, Spoke ED1 Breath, obtains the corresponding 2nd EVI-Link interfaces of EVI-Link that this equipment connects Hub ED2；

Step S512, VLAN marks and MAC Address that Spoke ED1 carry the MAC Address synchronization message after decapsulation Branch site forward table is configured to the corresponding relation of the 2nd EVI-Link interfaces for obtaining.

Due to Hub ED1 failures, by above-mentioned step S508-S512, Spoke ED1 can only receive Hub The MAC Address that other Spoke ED that ED2 synchronously comes learn.

In the situation once, the operation that Spoke ED2 are performed is repeated no more here with step S502-S512.

Situation two, Hub ED1 connect Spoke ED1 EVI-Link failures in the case of：

In the situation two, the operation that Spoke ED1 are performed is repeated no more here with step S502-S512.

In the situation two, the MAC address learning of Spoke ED2, forwarding-table item configuration modification and MAC Address are issued at least Comprise the following steps：

Step S502 ', Spoke ED2 receive the down state notification message that Hub ED1 send；Spoke ED2 exist After receiving the down state notification message, the EVI-Link interfaces in branch site forward table are revised as into second EVI-Link interfaces, wherein, the 2nd EVI-Link interfaces are the corresponding EVI-Link of EVI-Link that this equipment connects Hub ED2 Interface；

Wherein, the down state notification message is used to notify that this Hub ED are unavailable.

Hub ED1 can pass through other of connection after the EVI-Link failures for detecting this equipment connection Spoke ED1 EVI Link are to other Spoke ED：Spoke ED2 send down state notification message.

Step S504 ', Spoke ED2 by the VLAN of the ether network packet for receiving identify and source MAC with receive The corresponding relation of the port of the ether network packet is configured to central site forward table；Obtain the EVI- that this equipment connects HubED2 The corresponding 2nd EVI-Link interfaces of Link, by the VLAN marks and source MAC of the ether network packet for receiving and acquisition The corresponding relation of the 2nd EVI-Link interfaces is configured to branch site forward table；

Step S506 ', Spoke ED2 generate the MAC Address synchronization message for carrying above-mentioned VLAN marks and source MAC, According in step S504 ' in obtain the 2nd EVI-Link interfaces the MAC Address synchronization message of generation is encapsulated as into EVI messages simultaneously It is sent to Hub ED2.

Because Hub ED1 connect the EVI-Link failures of Spoke ED1, by above-mentioned step S502 '-S506 ', After receiving the down state notification message that Hub ED1 send, Spoke ED2 can be by this equipment in branch site forward table The corresponding EVI-Link interfaces of EVI-Link of connection Hub ED1 are revised as the EVI-Link correspondences of this equipment connection Hub ED2 EVI-Link interfaces, and, study to after MAC Address, only the MAC Address can be connected Hub ED2 with this equipment The corresponding relation of the corresponding EVI-Link interfaces of EVI-Link is configured to branch site forward table, and only by the MAC Address synchronization Give Hub ED2.

Step S508 ', Spoke ED2 receive the EVI messages that Hub ED2 send；

Step S510 ', the EVI messages for receiving are descapsulated into MAC Address synchronization message by Spoke ED2, obtain this equipment The corresponding 2nd EVI-Link interfaces of EVI-Link of connection Hub ED2；

Step S512 ', Spoke ED2 are by the VLAN marks carried in the MAC Address synchronization message and MAC Address and in step The corresponding relation of the 2nd EVI-Link interfaces obtained in rapid S512 ' is configured to branch site forward table.

Because Hub ED1 connect the EVI-Link failures of Spoke ED1, i.e. Hub ED1 are unavailable, by above-mentioned step S508 '-S512 ', Spoke ED2 can only receive the MAC Address that other synchronously next Spoke ED of Hub ED2 learn.

（2）The message repeating process of branch's edge device of branch site

Step S602, Spoke ED1 receive the ether network packet from local branch site；

Step S604, Spoke ED1 are according to the VLAN of the ether network packet for receiving marks and target MAC (Media Access Control) address in branch Corresponding 2nd EVI-Link interfaces are found in site forwarding table, wherein, the 2nd EVI-Link interfaces for finding are Spoke ED1 is connected to the outgoing interface of the EVI-Link of Hub ED2, then, according to the 2nd EVI-Link interfaces by the Ethernet for receiving Message is encapsulated as EVI messages, and is sent to Hub ED2.

Spoke ED1 are received after the EVI messages of Hub ED2, and the process for being decapsulated and being forwarded is with step S306- S310, repeats no more here.

（3）Mac learning, issue and the configuration of forwarding-table item of the center edge equipment of central site, and message forwarding Process

Now, Hub ED1 are unavailable, mac learning, issue and the configuration of forwarding-table item of Hub ED2, and message Repeating process is repeated no more here with step S202-S208.

4th, situation when primary Hub ED recover normal

Similar with unavailable, Hub ED1 recover available includes two kinds of situations：One kind is Hub ED1 fault recoveries, another kind of It is some EVI-Link fault recovery of Hub ED1 connections, the application is not limited this.After the fault recovery of Hub ED1, Each Spoke ED can connect the EVI-Link up of Hub ED1 by detecting this equipment（Normally）It is extensive to know Hub ED1 It is multiple available；If an EVI-Link fault recovery of Hub ED1 connections, for example, the EVI-Link being connected with Spoke ED1 Fault recovery, now, Hub ED1 can pass through other EVILink of connection to other Spoke ED：Spoke ED2 send extensive Multiple upstate notification message, so, Spoke ED1 can connect the EVI-Link up of Hub ED1 by detecting this equipment Know that Hub ED1 recover available, SpokeED2 can know that Hub ED1 recoveries can by recovering upstate notification message With.

Situation one, in the case of Hub ED1 fault recoveries：

In the situation once, by taking Spoke ED1 as an example, the forwarding-table item modification of the equipment is comprised the following steps：

Step S702, Spoke ED1 detect the state of the EVI-Link of this equipment connection Hub ED1 and Hub ED2； Spoke ED1 if desired switch back to HubED1, then when the EVI-Link for detecting this equipment connection Hub ED1 recovers normal The 2nd EVI-Link interfaces in branch site forward table are revised as an EVI-Link interfaces by Spoke ED1；

If Hub ED1 need not be switched back to, Spoke ED1 need not modify to branch site forward table.

Step S704, Spoke ED1 generate the unicast in the local branch site carried in central site forward table MAC Address and its corresponding VLAN mark MAC Address synchronization message, according to an EVI-Link interfaces by generate MAC ground Location synchronization message is encapsulated as EVI messages and is sent to Hub ED1.

Because Spoke ED1 may arrive MAC Address in the unavailable period study of Hub ED1, therefore, recover in HubED1 After can using, Spoke ED1 pass through step S704, it is possible to by the MAC of all of unicast learnt from local branch site Address（Including：The MAC Address learnt with unavailable period before Hub ED1 are unavailable）It is fully synchronized to give Hub ED1.

Recover available in Hub ED1, and switchback is to Hub ED1 after, the mac learning of Spoke ED1, issue and forward table The configuration process of item is repeated no more here with step S102-S110.

In the situation once, the operation that Spoke ED2 are performed is repeated no more here with step S702-S704.

Situation two, Hub ED1 connect Spoke ED1 EVI-Link fault recoveries in the case of：

In the situation two, the operation that Spoke ED1 are performed is repeated no more here with step S702-S704.

In the situation two, the forwarding-table item modification that Spoke ED2 are performed is comprised the following steps：

Step S802, Spoke ED2 receive the recovery upstate notification message that Hub ED1 send, wherein, the recovery Notification message is used to notify that Hub ED1 recover available；

Step S804, if desired switches back to Hub ED1, and Spoke ED2 are by the 2nd EVI- in branch site forward table Link interfaces are revised as an EVI-Link interfaces；

Step S806, Spoke ED2 generate the unicast in the local branch site carried in central site forward table The MAC Address synchronization message of MAC Address and its corresponding VLAN marks, according to this equipment EVI-Link pair of Hub ED1 is connected The MAC Address synchronization message of generation is encapsulated as EVI messages and is sent to Hub ED1 by the EVI-Link interfaces answered.

Recover available in Hub ED1, and switchback is to Hub ED1 after, the mac learning of Spoke ED2, issue and forward table The configuration process of item is repeated no more here with step S102-S110.

Fig. 5 show the difference point of the EVI networks of the Hub-Spoke frameworks of double Hub equipment of the embodiment of the present application offer The schematic diagram communicated between Zhi Zhandian.In Fig. 5, Hub ED1 are configured to primary Hub ED, and Hub ED2 are configured to standby Hub ED.Spoke ED1 set up EVI-Link and are connected with Hub ED1 and Hub ED2 respectively：EVI-Link1 and EVI-Link3, EVI- Link1 and EVI-Link3 the two EVI-Link form main and standby relations, backups of the EVI-Link3 as EVI-Link1.Equally, Spoke ED2 also set up EVI-Link and are connected with Hub ED1 and Hub ED2 respectively：EVI-Link4 and EVI-Link2, EVI- Link4 and EVI-Link2 the two EVI-Link also form main and standby relation, backups of the EVI-Link2 as EVI-Link4.MAC Address synchronization message can be realized using Intermediate System to Intermediate System message.

Assume Spoke ED1, Spoke ED2, Hub ED1 and Hub ED2 have the related port listed by table 1 and EVI-Link interfaces.

Table 1

Port A	The port of Spoke CE1 is connected on Spoke ED1
		Link1	The EVI-Link interfaces of the EVI-Link1 of Spoke ED1 connection Hub ED1
Link3	The EVI-Link interfaces of the EVI-Link3 of Spoke ED1 connection Hub ED2
		Port B	The port of Spoke CE2 is connected on Spoke ED2
Link2	The EVI-Link interfaces of the EVI-Link2 of Spoke ED2 connection Hub ED2
		Link4	The EVI-Link interfaces of the EVI-Link4 of Spoke ED2 connection Hub ED1
Port C	The interface of Hub CE1 is connected on Hub ED1
		Port D	The interface of Hub CE2 is connected on Hub ED2
Link1’	The EVI-Link interfaces of the EVI-Link1 of Hub ED1 connection Spoke ED1
		Link4’	The EVI-Link interfaces of the EVI-Link4 of Hub ED1 connection Spoke ED2
Link3’	The EVI-Link interfaces of the EVI-Link3 of Hub ED2 connection Spoke ED1
		Link2’	The EVI-Link interfaces of the EVI-Link2 of Hub ED2 connection Spoke ED2

Based on table 1, Spoke ED1, Spoke ED2, Hub ED1 and Hub ED2 are configured with broadcast MAC forwarding-table items Forward table respectively such as table 2-1,2-2,2-3, shown in 2-4.

Table 2-1

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index（Index）
				FFFF-FFFF-FFFF	PORT A	10	Hub sides
FFFF-FFFF-FFFF	Link1	10	Spoke sides

Table 2-2

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF	PORT B	10	Hub sides
FFFF-FFFF-FFFF	Link4	10	Spoke sides

Table 2-3

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF	Link1’,Link4’	10	Hub sides
FFFF-FFFF-FFFF	Port C	10	Spoke sides

Table 2-4

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF	Link3’,Link2’	10	Hub sides
FFFF-FFFF-FFFF	Port D	10	Spoke sides

Spoke ED1 receive the ether network packet that Spoke CE1 forwardings come from Port A, the ether network packet VLAN ID are VLAN10, and source MAC is MAC1（It is connected to the MAC Address of the main frame 1 of Spoke CE1）, target MAC (Media Access Control) address For MAC2（It is connected to the MAC Address of the main frame 2 of Spoke CE2）, VLAN10s and source of the SpokeED1 according to the ether network packet MAC Address MAC1 is in branch site forward table（The table of the list item composition drawn with Spoke funiculus lateralis, referred to as branch site forward table） In do not find the list item of matching, then respectively in central site forward table（The table of the list item composition drawn with Hub funiculus lateralis, referred to as Central site forward table）With the list item that configuration in branch site forward table includes VLAN10 and MAC1.Table 3-1 show The central site forward table and branch site forward table of Spoke ED1.

Table 3-1

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Port A	VLAN10	Hub sides
MAC1	Port A	VLAN10	Hub sides
				FFFF-FFFF-FFFF-FFFF	Link1	VLAN10	Spoke sides
MAC1	Link1	VLAN10	Spoke sides

In the central site forward table of table 3-1, the corresponding outgoing interfaces of MAC1 are the ports for receiving the ether network packet PortA；In the branch site forward table of table 3-1, the corresponding outgoing interfaces of MAC1 are the EVI- that Spoke ED1 are connected to Hub ED1 The corresponding EVI-Link interfaces of Link1：Link1.

If it is corresponding with target MAC (Media Access Control) address MAC2 that Spoke ED1 do not find VLAN10 in branch's forward table of this equipment List item, then VLAN10s of the Spoke ED1 in branch site is broadcasted, and is not forwarded in EVI networks, corresponding to reduce The broadcast forwarding of unknown unicast message in the EVI networks of Hub-Spoke frameworks.That is, the unknown unicast ether of target MAC (Media Access Control) address Network packet is broadcasted only in this VLAN, and is not forwarded in EVI networks.

Spoke ED1 generate the IS-IS messages for carrying VLAN10 and MAC1, are respectively the IS- according to Link1 and Link3 IS messages encapsulate EVI heads, and the IS-IS messages are encapsulated as into EVI messages.Wherein, Link1 or Link3 at least include following information： Outer layer Ethernet header（Such as public network VLAN ID, the MAC Address of the next-hop for reaching EVI tunnels opposite end）, IP gre tunneling heads Outer layer IP headers（Such as IP address, the IP address of opposite end EVI tunnel interfaces of local EVI tunnel interfaces）, IP gre tunnelings The gre tunneling header of head（Tunnel type）, EVI message exit ports（The actual transmission physical port of EVI messages）.

The EVI messages that encapsulation is obtained are sent respectively to Hub ED1 and Hub ED2 by Spoke ED1.So as to SpokeED1 By this learning equipment to MAC1 be synchronized to Hub ED1 and Hub ED2.

Hub ED1 receive the EVI messages that Spoke ED1 send, and the EVI messages are descapsulated into into IS-IS messages, Hub According to the VLAN10 that MAC1 is associated with EVI headings and Intermediate System to Intermediate System, that determine the carrying of EVI tunnels is EVI-Link1 to ED1 EVI-Link interfaces corresponding with the EVI-Link1：Link1’.Then, Hub ED1 are respectively in central site forward table and branch The corresponding list items of MAC1 and VLAN10 are configured in site forwarding table.Table 3-2 show the central site forward table of Hub ED1 and Branch site forward table.

Table 3-2

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Link1’,Link4’	VLAN10	Hub sides
MAC1	Link1’	VLAN10	Hub sides
				FFFF-FFFF-FFFF-FFFF	Port C	VLAN10	Spoke sides
MAC1	Port C	VLAN10	Spoke sides

Hub ED1 will decapsulate the IS-IS messages of the carrying VLAN10 and MAC1 for obtaining, and being according to interface Link4 ' should IS-IS messages encapsulate EVI heads, and the IS-IS messages are encapsulated as into EVI messages.The EVI messages are sent to Spoke by Hub ED1 ED2.So as to the MAC1 that Spoke ED1 synchronously come is continued to be synchronized to SpokeED2 by Hub ED1.

Equally, Hub ED2 receive the handling process after the EVI messages that Spoke ED1 send with Hub ED1, shown in table 3-3 For the central site forward table and branch site forward table of Hub ED2.

Table 3-3

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Link3’,Link2’	VLAN10	Hub sides
MAC1	Link3’	VLAN10	Hub sides
				FFFF-FFFF-FFFF-FFFF	Port D	VLAN10	Spoke sides
MAC1	Port D	VLAN10	Spoke sides

The IS-IS messages of the carrying VLAN10 and MAC1 that Hub ED2 can also obtain decapsulation, be according to interface Link2 ' The IS-IS messages encapsulation EVI heads, by the IS-IS messages EVI messages are encapsulated as.The EVI messages are sent to Spoke by Hub ED2 ED2.So as to the MAC1 that Spoke ED1 synchronously come also is continued to be synchronized to Spoke ED2 by Hub ED2.

Spoke ED2 receive the EVI messages that Hub ED1 send, and the EVI messages are descapsulated into into IS-IS messages, Spoke According to the VLAN10 that MAC1 is associated with EVI headings and Intermediate System to Intermediate System, that determine the carrying of EVI tunnels is EVI-Link4 to ED2 And the corresponding EVI-Link interfaces of the EVI-Link4：Link4.Spoke ED2 match somebody with somebody in the branch site forward table of this equipment Put the corresponding list items of MAC1 and VLAN10.Table 3-4 show the central site forward table of SpokeED2 and branch site forwarding Table.

Table 3-4

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Port B	VLAN10	Hub sides
MAC1	Link4	VLAN10	Spoke sides
				FFFF-FFFF-FFFF-FFFF	Link4	VLAN10	Spoke sides

Spoke ED2, will not be by wherein after the EVI messages obtained by the encapsulation of IS-IS messages that Hub ED2 send are received Comprising the corresponding list item of MAC1 and VLAN10 increase in branch site forward table.

Spoke ED2 receive the ether network packet from Spoke CE2, the VLAN of the ether network packet from Port B ID is VLAN10, and source MAC is MAC2, and target MAC (Media Access Control) address is MAC1.Spoke ED2 are according in the ether network packet VLAN10 and source MAC MAC2, does not find the list item of matching in the branch site forward table of table 3-4, then respectively at this The corresponding list items of VLAN10 and MAC2 are configured in the central site forward table and branch site forward table of equipment.Table 4-1 show Central site forward table and branch site forward table after Spoke ED2 renewals.

Table 4-1

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Port B	VLAN10	Hub sides
MAC2	Port B	VLAN10	Hub sides
				FFFF-FFFF-FFFF-FFFF	Link4	VLAN10	Spoke sides
MAC1	Link4	VLAN10	Spoke sides
				MAC2	Link4	VLAN10	Spoke sides

In the central site forward table of table 4-1, the corresponding outgoing interfaces of MAC2 are the ports for receiving the ether network packet PortB；In the branch site forward table of table 4-1, the corresponding outgoing interfaces of MAC2 are the EVI- that Spoke ED2 are connected to Hub ED1 The corresponding EVI-Link interfaces of Link4：Link4.

Spoke ED2 generate the IS-IS messages for carrying VLAN10 and MAC2, are respectively the IS- according to Link2 and Link4 IS messages encapsulate EVI heads, and the IS-IS messages are encapsulated as into EVI messages.Spoke ED2 respectively send the EVI messages after encapsulation Give Hub ED1 and Hub ED2.So as to, Spoke ED2 by this learning equipment to MAC2 be synchronized to Hub ED1 and Hub ED2.

Spoke ED2 according to the VLAN10 and target MAC (Media Access Control) address MAC1 of the ether network packet for receiving, table 4-1 point The list item that matching is found in site forwarding table is propped up, the outgoing interface in the list item for finding is：Link4, then should according to Link4 Ether network packet is encapsulated as EVI messages, and the EVI messages after encapsulation are sent to Hub ED1.

Hub ED1 receive the EVI messages that Spoke ED2 send, and the EVI messages are descapsulated into into IS-IS messages, Hub According to the VLAN10 that MAC2 is associated with EVI headings and Intermediate System to Intermediate System, that determine the carrying of EVI tunnels is EVI-Link4 to ED1 And the corresponding EVI-Link interfaces of the EVI-Link4：Link4’.Then, Hub ED1 in central site forward table and divide respectively Prop up and configure in site forwarding table the corresponding list items of MAC2 and VLAN10.Table 4-2 is the central site forward table after Hub ED1 renewals And branch site forward table.

Table 4-2

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Link1’,Link4’	VLAN10	Hub sides
MAC1	Link1’	VLAN10	Hub sides
				MAC2	Link4’	VLAN10	Hub sides
FFFF-FFFF-FFFF-FFFF	PORT C	VLAN10	Spoke sides
				MAC1	PORT C	VLAN10	Spoke sides
MAC2	PORT C	VLAN10	Spoke sides

Hub ED1 will decapsulate the IS-IS messages of the carrying VLAN10 and MAC2 for obtaining, and being according to interface Link1 ' should IS-IS messages encapsulate EVI heads, and the IS-IS messages are encapsulated as into EVI messages.The EVI messages are sent to Spoke by Hub ED1 ED1.So as to the MAC2 that Spoke ED2 synchronously come is continued to be synchronized to SpokeED1 by Hub ED1.

Equally, Hub ED2 receive the EVI messages that Spoke ED2 send, and the EVI messages are descapsulated into into IS-IS messages, According to the VLAN10 that MAC2 is associated with EVI headings and Intermediate System to Intermediate System, that determine the carrying of EVI tunnels is EVI- to Hub ED2 The corresponding EVI-Link interfaces of the Link2 and EVI-Link2：Link2’.Then, HubED2 is respectively in central site forward table With the corresponding list items of configuration MAC2 and VLAN10 in branch site forward table.Table 4-3 is that the central site after Hub ED2 renewals turns Deliver and branch site forward table.

Table 4-3

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Link3’,Link2’	VLAN10	Hub sides
MAC1	Link3’	VLAN10	Hub sides
				MAC2	Link2’	VLAN10	Hub sides
FFFF-FFFF-FFFF-FFFF	Port D	VLAN10	Spoke sides
				MAC1	Port D	VLAN10	Spoke sides
MAC2	Port D	VLAN10	Spoke sides

Hub ED2 will decapsulate the IS-IS messages of the carrying VLAN10 and MAC2 for obtaining, and being according to interface Link3 ' should IS-IS messages encapsulate EVI heads, and the IS-IS messages are encapsulated as into EVI messages.The EVI messages are sent to Spoke by Hub ED2 ED1.So as to the MAC2 that Spoke ED2 synchronously come also is continued to be synchronized to Spoke ED1 by Hub ED2.

Hub ED1 receive the EVI messages that Spoke ED2 send, and the EVI messages are descapsulated into into ether network packet, according to VLAN10 and target MAC (Media Access Control) address MAC1 in the ether network packet, in the branch site forward table of table 4-2 matching is found List item, then according to the outgoing interface Port C of the list item for finding, the ether network packet is sent to Hub CE1.Hub CE1 are received The ether network packet is managed, and such as monitors and counts, then the ether network packet is returned to into Hub ED1.

As can be seen here, in embodiment illustrated in fig. 5, Hub websites not only realize the communication between each branch site, can also be right The message data stream of each branch site is managed collectively.

Hub ED1 receive the ether network packet of Hub CE1 returns, the VLAN10 and purpose in the ether network packet MAC Address MAC1 finds the list item of matching in the central site forward table shown in table 4-2, then according in the list item for finding Outgoing interface Link1 ', the ether network packet is encapsulated as into EVI messages, the EVI messages after encapsulation are sent to into Spoke ED1.

Spoke ED1 receive the EVI messages that Hub ED1 send, and the EVI messages are descapsulated into into IS-IS messages, Spoke According to the VLAN10 that MAC2 is associated with EVI headings and Intermediate System to Intermediate System, that determine the carrying of EVI tunnels is EVI-Link1 to ED1 And the corresponding EVI-Link interfaces of the EVI-Link1：Link1.Spoke ED1 match somebody with somebody in the branch site forward table of this equipment Put the corresponding list items of MAC2 and VLAN10.Table 4-4 show the central site forward table after SpokeED1 updates and tributary station Point forward table.

Table 4-4

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Port A	VLAN10	Hub sides
MAC1	Port A	VLAN10	Hub sides
				FFFF-FFFF-FFFF-FFFF	Link1	VLAN10	Spoke sides
MAC1	Link1	VLAN10	Spoke sides
				MAC2	Link1	VLAN10	Spoke sides

In the branch site forward table of table 4-4, the corresponding outgoing interfaces of MAC2 are connected to Hub ED1's for Spoke ED1 The corresponding EVI-Link interfaces of EVI-Link1：Link1.

In addition, Spoke ED1 are receiving the EVI messages that Hub ED2 send, the EVI messages are descapsulated into into IS-IS reports Text, but, Spoke ED1 will not increase the MAC2 and VLAN10 couple included in the IS-IS messages in branch site forward table The list item answered.

Spoke ED1 receive the EVI messages that Hub ED1 send, and the EVI messages are descapsulated into into ether network packet, according to VLAN10 and target MAC (Media Access Control) address MAC1 in the ether network packet, in the central site forward table of table 4-4 matching is found List item, then according to the outgoing interface Port A of the list item for finding, the ether network packet is sent to Spoke CE1.

, according to the forward table of this plant maintenance, forwarding ether network packet is to main frame 1 for Spoke CE1.

In addition, when main frame 1 sends the broadcast ether network packet that target MAC (Media Access Control) address is broadcast MAC address, SpokeCE1 is received The broadcast ether network packet for arriving is broadcasted in VLAN10.Spoke ED1 receive the broadcast ether network packet in VLAN10, according to VLAN10 and broadcast MAC address, find the list item of matching, the EVI- in the list item in the branch site forward table of table 4-4 Link interfaces are：Link1, then be encapsulated as the broadcast ether network packet according to Link1 broadcasting EVI messages, is sent to Hub ED1。

Hub ED1 receive broadcast EVI messages, by broadcast EVI messages be descapsulated into broadcast ether network packet, according to this with VLAN10 and broadcast MAC address too in network packet, finds the list item of matching, then in the branch site forward table of table 4-2 Outgoing interface Port C in the list item for finding, the broadcast ether network packet is sent to HubCE1.Hub CE1 receive this Broadcast ether network packet is managed, and such as monitors and counts, then the broadcast ether network packet is returned to into Hub ED1.

Hub ED1 receive the broadcast ether network packet of Hub CE1 returns, according to the VLAN10 in the broadcast ether network packet With the list item that broadcast MAC address finds matching in the central site forward table of table 4-2, the then list item that respectively basis finds In outgoing interface Link1 ' and Link4 ', by the broadcast ether network packet be encapsulated as broadcast EVI messages, by the broadcast after encapsulation EVI messages are sent to Spoke ED1 and Spoke ED2.

Spoke ED1 are received after broadcast EVI messages, determine that the message is sent out by this equipment by the source MAC of message Go out, therefore, principle can be filtered based on source and do discard processing, prevent the internal loopback of data flow.Spoke ED2 receive the broadcast After EVI messages, broadcast EVI messages are descapsulated into into broadcast ether network packet, according in the broadcast ether network packet VLAN10 and broadcast MAC address, find the list item of matching in the central site forward table of table 4-1, then basis finds Outgoing interface Port B in list item, the broadcast ether network packet is sent to SpokeCE2.Spoke CE2 are according to this plant maintenance Forward table, the broadcast ether network packet for receiving is broadcasted in VLAN10.

Subsequently, after Hub ED1 failures, Spoke ED1 detect EVI-Link1down, then by the tributary station in table 4-4 The corresponding EVI-Link interfaces Link1 of EVI-Link1 in point forward table are revised as：The corresponding EVI-Link of EVI-Link3 connect Mouth Link3, now, table 4-4 is updated to table 5-1.Equally, Spoke ED2 detect EVI-Link4down, then by table 4-1 The corresponding EVI-Link interfaces Link4 of EVI-Link4 in branch site forward table are revised as：The corresponding EVI- of EVI-Link2 Link interface Link2, now, table 4-1 is updated to table 5-2.

Table 5-1

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Port A	VLAN10	Hub sides
MAC1	Port A	VLAN10	Hub sides
				FFFF-FFFF-FFFF-FFFF	Link3	VLAN10	Spoke sides
MAC1	Link3	VLAN10	Spoke sides
				MAC2	Link3	VLAN10	Spoke sides

Table 5-2

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Port B	VLAN10	Hub sides
MAC2	Port B	VLAN10	Hub sides
				FFFF-FFFF-FFFF-FFFF	Link2	VLAN10	Spoke sides
MAC1	Link2	VLAN10	Spoke sides
				MAC2	Link2	VLAN10	Spoke sides

When Spoke ED1 receive the ether network packet that Spoke CE1 send, the source MAC of the ether network packet is MAC3, target MAC (Media Access Control) address is MAC2, and VLAN ID are VLAN10, and Spoke ED1 are not looked into according to MAC3 and VLAN10 in table 5-1 Matching list item is found, then increases MAC3 and VLAN10 pair in the central site forward table and branch site forward table in table 5-1 The list item answered, now, table 5-1 is updated to table 6-1.Meanwhile, Spoke ED1 generate the IS-IS reports for carrying MAC3 and VLAN10 Text, is encapsulated as EVI messages and is sent to Hub ED2 according to Link3 by the IS-IS messages.Spoke ED1 are according to MAC2 and VLAN10 The list item of matching is found in the branch site forward table shown in table 6-1, the EVI-Link interfaces in the list item are Link3, Therefore, the ether network packet can be packaged into by EVI messages according to Link3 and is sent to Hub ED2.

Table 6-1

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Port A	VLAN10	Hub sides
MAC1	Port A	VLAN10	Hub sides
				MAC3	Port A	VLAN10	Hub sides
FFFF-FFFF-FFFF-FFFF	Link3	VLAN10	Spoke sides
				MAC1	Link3	VLAN10	Spoke sides
MAC2	Link3	VLAN10	Spoke sides
				MAC3	Link3	VLAN10	Spoke sides

Hub ED2 are received after the EVI messages that Spoke ED1 send, and the EVI messages are descapsulated into into IS-IS messages, Increase in central site forward table and branch site forward table shown in table 4-3 in the IS-IS messages carry MAC3 and The corresponding list items of VLAN10.Central site forward table and branch site forward table such as table 6-2 after Hub ED2 renewals.

Table 6-2

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Link3’,Link2’	VLAN10	Hub sides
MAC1	Link3’	VLAN10	Hub sides
				MAC2	Link2’	VLAN10	Hub sides
MAC3	Link3’	VLAN10	Hub sides
				FFFF-FFFF-FFFF-FFFF	Port D	VLAN10	Spoke sides
MAC1	Port D	VLAN10	Spoke sides
				MAC2	Port D	VLAN10	Spoke sides
MAC3	Port D	VLAN10	Spoke sides

MAC3 and VLAN10 are continued the process for being synchronized to Spoke ED2 ibid by Hub ED2, are repeated no more here.

Hub ED2 receive the EVI messages that Spoke ED1 send, and the EVI messages are descapsulated into into ether network packet, press The operating process that forwarding is packaged according to branch site forward table ibid, is repeated no more here.

The EVI messages are descapsulated into IS-IS messages by Spoke ED2 after the EVI messages that Hub ED2 send are received, Increase the MAC3 and the corresponding list items of VLAN10 carried in the IS-IS messages in the branch site forward table shown in table 5-2, Central site forward table and branch site forward table after Spoke ED2 renewals is as shown in table 6-3：

Table 6-3

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Port B	VLAN10	Hub sides
MAC2	Port B	VLAN10	Hub sides
				FFFF-FFFF-FFFF-FFFF	Link2	VLAN10	Spoke sides
MAC1	Link2	VLAN10	Spoke sides
				MAC2	Link2	VLAN10	Spoke sides
MAC3	Link2	VLAN10	Spoke sides

After Hub ED1 fault recoveries, Spoke ED1 detect EVI-Link1up, if desired by primary Hub ED switchbacks To Hub ED1, then the Link3 in the branch site forward table in table 6-1 can be revised as Link1 by Spoke ED1, now table 6- 1 modification is for table 6-4.If not needing switchback to Hub ED2, Spoke ED1 will not modify to table 6-1.

Spoke ED1 can also be by the MAC Address of the unicast in the local branch site in central site forward table：MAC1、 MAC3 and its respective VLAN ID：VLAN10 is carried in IS-IS messages, and is encapsulated as the IS-IS messages according to Link1 EVI messages are sent to Hub ED1.So, MAC3 the and its VLAN ID couple that Hub ED1 just can newly learn Spoke ED1 The list item answered is configured in table 4-2, now, the central site forward table and branch site forward table such as table after Hub ED1 renewals Shown in 6-5.

Table 6-4

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Port A	VLAN10	Hub sides
MAC1	Port A	VLAN10	Hub sides
				MAC3	Port A	VLAN10	Hub sides
FFFF-FFFF-FFFF-FFFF	Link1	VLAN10	Spoke sides
				MAC1	Link1	VLAN10	Spoke sides
MAC2	Link1	VLAN10	Spoke sides
				MAC3	Link1	VLAN10	Spoke sides

Table 6-5

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Link1’,Link4’	VLAN10	Hub sides
MAC1	Link1’	VLAN10	Hub sides
				MAC2	Link4’	VLAN10	Hub sides
MAC3	Link1’	VLAN10	Hub sides
				FFFF-FFFF-FFFF-FFFF	PORT C	VLAN10	Spoke sides
MAC1	PORT C	VLAN10	Spoke sides
				MAC2	PORT C	VLAN10	Spoke sides
MAC3	PORT C	VLAN10	Spoke sides

Equally, Spoke ED2 detect EVI-Link4up, and if desired switchback can be by table to Hub ED1, then Spoke ED2 The Link2 in branch site forward table in 6-3 is revised as Link4, and now table 6-3 is changed for table 6-6.If need not return Cut, then Spoke ED2 will not modify to table 6-3.

Spoke ED2 also can be by the MAC Address of the unicast in the local branch site in central site forward table：MAC2 and Its VLAN ID：VLAN10 is carried in IS-IS messages, and the IS-IS messages are encapsulated as into EVI messages according to Link4 are sent to Hub ED1。

Table 6-6

Target MAC (Media Access Control) address	Outlet outgoing interfaces	VLAN ID	Index
				FFFF-FFFF-FFFF-FFFF	Port B	VLAN10	Hub sides
MAC2	Port B	VLAN10	Hub sides
				FFFF-FFFF-FFFF-FFFF	Link4	VLAN10	Spoke sides
MAC1	Link4	VLAN10	Spoke sides
				MAC2	Link4	VLAN10	Spoke sides
MAC3	Link4	VLAN10	Spoke sides

Subsequently, Hub ED1 and Hub ED2 will carry out message repeating process according to table 6-5 and table 6-2 respectively.If desired Switchback to Hub ED1, then Spoke ED1 and Spoke ED2 can carry out message repeating process according to table 6-4 and table 6-6 respectively, if Do not need switchback to Hub ED1, then Spoke ED1 and Spoke ED2 can carry out message forwarding according to table 6-1 and table 6-3 respectively Process.

For the method in above-described embodiment, embodiments herein additionally provide it is a kind of can apply the method message Retransmission unit, the apparatus for forwarding message can apply to Spoke ED, and the Spoke ED are located at the EVI nets of Hub-Spoke frameworks Branch site in network, and central site includes：Two Hub ED, the two Hub ED form main and standby relation.

As shown in fig. 6, the apparatus for forwarding message includes：Receiver module 10, processing module 20, sending module 30 and storage mould Block 40, wherein：

Receiver module 10, for receiving ether network packet and EVI messages；

Processing module 20, the VLAN of the ether network packet for being received according to receiver module 10 is identified and purpose MAC ground Location finds a corresponding EVI-Link interfaces in branch site forward table, wherein, an EVI-Link interfaces are corresponded to This ED connects the EVI-Link of primary Hub ED；The EVI messages for being additionally operable to receive receiver module 10 are descapsulated into Ethernet Message, finds according to the VLAN of the ether network packet after decapsulation marks and target MAC (Media Access Control) address in central site forward table Corresponding port；

Sending module 30, the EVI-Link interfaces for being found according to processing module 20 receive receiver module 10 To ether network packet be encapsulated as EVI messages and be sent to primary Hub ED；It is additionally operable to the end found by processing module 20 Mouth sends the ether network packet after decapsulation；

Memory module 40, for preserving branch site forward table and central site forward table.

Wherein, processing module is additionally operable to the VLAN marks and source MAC of the ether network packet for receiving receiver module Central site forward table is configured to the corresponding relation of the port for receiving the ether network packet；It is additionally operable to obtain this ED connections two The corresponding EVI-Link interfaces of EVI-Link of individual Hub ED；The VLAN marks of the ether network packet for being additionally operable to receive and source The corresponding relation of the EVI-Link interfaces in MAC Address and two EVI-Link interfaces of acquisition is configured to branch site and turns Deliver；It is additionally operable to generate the MAC Address synchronization message for carrying VLAN marks and source MAC；Sending module is additionally operable to root respectively The MAC Address synchronization message of generation is encapsulated as EVI messages and is sent out by the two EVI-Link interfaces obtained according to processing module Go.

In addition, the EVI messages that processing module is additionally operable to receive receiver module are descapsulated into MAC Address synchronization message； It is additionally operable to obtain the corresponding EVI-Link interfaces of EVI-Link that this ED connects primary Hub ED, by the MAC after decapsulation The VLAN marks and MAC Address that address synchronization message is carried is configured to point with the corresponding relation of an EVI-Link interfaces of acquisition Prop up site forwarding table.

Processing module is additionally operable to that VLAN marks and broadcast MAC address are connected EVI-Link pair of primary Hub ED with this ED The corresponding relation of the EVI-Link interfaces answered is configured to branch site forward table, by VLAN mark and broadcast MAC address and This ED connects the corresponding relation of the port of the Spoke CE of local branch site and is configured to central site forward table.

According to a kind of embodiment of the application, can also include in the apparatus for forwarding message：Detection module, wherein：

Detection module is used to detect the state of the EVI-Link that this ED connects two Hub ED；

Processing module is additionally operable to when detection module detects this ED and connects the EVI-Link failures of primary Hub ED, will be divided The EVI-Link interfaces propped up in site forwarding table are revised as the 2nd EVI-Link interfaces, wherein, the 2nd EVI-Link interfaces Connect the EVI-Link of standby Hub ED corresponding to this ED；The VLAN marks of the ether network packet for being additionally operable to receive receiver module Know and source MAC is configured to central site forward table with the corresponding relation of the port for receiving the ether network packet；It is additionally operable to The corresponding 2nd EVI-Link interfaces of EVI-Link that this ED connects standby Hub ED are obtained, by the ether network packet for receiving VLAN is identified and source MAC is configured to branch site forward table with the corresponding relation of the 2nd EVI-Link interfaces for obtaining；Also For generating the MAC Address synchronization message for carrying VLAN marks and source MAC；It is additionally operable to receive from standby Hub The EVI messages of ED are descapsulated into MAC Address synchronization message, obtain the EVI-Link corresponding second that this ED connects standby Hub ED EVI-Link interfaces, the VLAN marks that the MAC Address synchronization message after decapsulation is carried and MAC Address and second for obtaining The corresponding relation of EVI-Link interfaces is configured to branch site forward table；Be additionally operable to detection module detect this ED connection it is primary When the EVI-Link of Hub ED recovers normal, judge whether to need to switch back into primary Hub ED from standby Hub ED, if desired from Standby Hub ED switch back into primary Hub ED, then the 2nd EVI-Link interfaces in branch site forward table are revised as into first EVI-Link interfaces, the MAC Address of the unicast in local branch site that generation carries in central site forward table and its right The MAC Address synchronization message of the VLAN marks answered；

Sending module is additionally operable to the MAC Address synchronization that the 2nd EVI-Link interfaces will be generated got according to processing module Message is encapsulated as EVI messages and is sent to standby Hub ED；It is additionally operable to be generated processing module according to an EVI-Link interfaces MAC Address synchronization message be encapsulated as EVI messages and be sent to primary Hub ED.

According to another kind of embodiment of the application, receiver module, processing module and sending module also have following functions：

Receiver module, is additionally operable to receive down state notification message and recovery upstate notification message；

Processing module, be additionally operable to receiver module receive down state notification message that primary Hub ED send it Afterwards, the EVI-Link interfaces in branch site forward table are revised as into the 2nd EVI-Link interfaces, wherein, the 2nd EVI- Link interfaces connect the EVI-Link of standby Hub ED corresponding to this ED；It is additionally operable to the ether network packet for receiving receiver module VLAN marks and source MAC and the corresponding relation of the port for receiving the ether network packet be configured to central site and forward Table；Be additionally operable to obtain the corresponding 2nd EVI-Link interfaces of EVI-Link that this ED connects standby Hub ED, will receive with The VLAN marks and source MAC of too network packet is configured to branch site with the corresponding relation of the 2nd EVI-Link interfaces for obtaining Forward table；It is additionally operable to generate the MAC Address synchronization message for carrying VLAN marks and source MAC；It is additionally operable to coming for receiving MAC Address synchronization message is descapsulated into from the EVI messages of standby Hub ED, the EVI-Link that this ED connects standby Hub ED is obtained Corresponding 2nd EVI-Link interfaces, by after decapsulation MAC Address synchronization message carry VLAN mark and MAC Address with obtain The corresponding relation of the 2nd EVI-Link interfaces for taking is configured to branch site forward table；It is additionally operable to be received in receiver module primary After the recovery upstate notification message that Hub ED send, judge whether to need to switch back into primary Hub from standby Hub ED ED, if desired switches back into primary Hub ED from standby Hub ED, then by the 2nd EVI-Link interfaces in branch site forward table An EVI-Link interfaces are revised as, generation carries the MAC of the unicast in the local branch site in central site forward table Address and its MAC Address synchronization message of corresponding VLAN marks；

Sending module, the 2nd EVI-Link interfaces for being additionally operable to be got according to processing module are same by the MAC Address for generating Step message is encapsulated as EVI messages and is sent to standby Hub ED；It is additionally operable to the MAC ground by generation according to an EVI-Link interfaces Location synchronization message is encapsulated as EVI messages and is sent to primary Hub ED.

For above-mentioned method, embodiments herein additionally provides a kind of can forwarding using the message of the method and fills Put, the apparatus for forwarding message be applied to constitute main and standby relation two Hub ED in any one, the two of this composition main and standby relation Individual Hub ED are located at the central site of the EVI networks of Hub-Spoke frameworks, and the apparatus for forwarding message includes：Receiver module, process Module, sending module, detection module, notification module and memory module, wherein：

Receiver module, for receiving EVI messages and ether network packet；

Notification module, for when detection module detects this ED and connects the EVI-Link failures of any one Spoke ED, Notify that other Spoke ED this ED is unavailable, when the EVI-Link that detection module detects failure recovers normal, notifies other Spoke ED this ED recoveries are available；

Wherein, the EVI messages that processing module is additionally operable to receive receiver module are descapsulated into MAC Address synchronization message, obtain Take the corresponding EVI-Link interfaces of EVI-Link of the Spoke ED of this ED linkup transmits EVI messages；It is additionally operable to MAC Address The VLAN marks and MAC Address that synchronization message is carried is configured to central site and turns with the corresponding relation of the EVI-Link interfaces for obtaining Deliver, the VLAN marks and MAC Address of the carrying of MAC Address synchronization message are connected into the central user edge of central site with this ED The corresponding relation of the port of equipment Hub CE is configured to branch site forward table；Be additionally operable to obtain this ED connect other branch sites Spoke ED the corresponding EVI-Link interfaces of EVI-Link；Sending module be additionally operable to according to processing module obtain connection its The corresponding EVI-Link interfaces of EVI-Link of the Spoke ED of his branch site, MAC Address synchronization message is encapsulated respectively again And send again encapsulate after EVI messages.

Wherein, processing module is additionally operable to for VLAN marks and broadcast MAC address to be connected each branch site with this ED The corresponding relation of the corresponding EVI-Link interfaces of EVI-Link of Spoke ED is configured to central site forward table, and VLAN is identified Branch site forward table is configured to the corresponding relation of the port that broadcast MAC address is connected Hub CE with this ED.

To sum up, the application above example can reach following technique effect：

（1）Message forwarding in the EVI networks of the Hub-spoke frameworks for realizing double Hub equipment；

（2）By disposing two sets of Hub equipment in the EVI networks of Hub-Spoke frameworks（Including Hub ED and Hub CE）, When avoiding only a set of Hub equipment, the normal forwarding of the data flow of all branch sites is affected due to Hub equipment faults, Improve the reliability and stability of Hub equipment；

（3）The management of the data flow in EVI networks is realized, also, by deploying two sets of Hub equipment, is realized more Plus the management of reliable data flow, including monitoring and statistics.

The preferred embodiment of the application is the foregoing is only, not to limit the application, all essences in the application Within god and principle, any modification, equivalent substitution and improvements done etc. should be included within the scope of the application protection.

Claims

1. a kind of message forwarding method, it is characterised in that the method is applied to branch edge device Spoke ED, the Spoke ED The branch site in EVI networks is virtually interconnected positioned at the Ethernet of Hub-Spoke frameworks, central site includes：Formed active and standby Two center edge equipment Hub ED of relation, methods described includes：

The Spoke ED receive the ether network packet from local branch site, according to the VLAN of the ether network packet for receiving Mark and target MAC (Media Access Control) address find a corresponding EVI-Link interfaces in branch site forward table, according to what is found The ether network packet for receiving is encapsulated as EVI messages and is sent to primary Hub ED by the first EVI-Link interfaces, wherein, First EVI-Link interfaces connect the EVI-Link of primary Hub ED corresponding to this equipment；And, obtain this equipment connection described two The corresponding EVI-Link interfaces of EVI-Link of individual Hub ED, generate the MAC Address for carrying the VLAN marks and source MAC Synchronization message, is encapsulated as EVI messages simultaneously according to the two EVI-Link interfaces for obtaining by the MAC Address synchronization message of generation respectively It is sent to described two Hub ED；

The Spoke ED receive the EVI messages from the primary Hub ED, and the EVI messages are descapsulated into into Ethernet report Text, it is right to be found in central site forward table according to the VLAN of the ether network packet after decapsulation marks and target MAC (Media Access Control) address The port answered, by the ether network packet branch service edge device of local branch site is sent to by the port for finding Spoke CE。

2. method according to claim 1, it is characterised in that also include：

The Spoke ED by the VLAN of the ether network packet for receiving identify and source MAC with receive the ether network packet The corresponding relation of port be configured to the central site forward table；By the VLAN of the ether network packet for receiving mark and The corresponding relation of the EVI-Link interfaces in source MAC and two EVI-Link interfaces of acquisition is configured to the branch Site forwarding table.

3. method according to claim 1, it is characterised in that also include：

The Spoke ED receive the EVI messages from primary Hub ED, and the EVI messages for receiving are descapsulated into into MAC Address Synchronization message；

The Spoke ED obtain the corresponding EVI-Link interfaces of EVI-Link that this equipment connects primary Hub ED, will solve The VLAN marks and MAC Address that MAC Address synchronization message after encapsulation is carried is corresponding with the EVI-Link interfaces for obtaining Relation is configured to the branch site forward table.

4. method according to claim 1, it is characterised in that also include：

The Spoke ED identify VLAN and broadcast MAC address is corresponding with the EVI-Link that this equipment connects primary Hub ED The corresponding relation of the first EVI-Link interfaces is configured to the branch site forward table；By VLAN mark and broadcast MAC address and This equipment connects the corresponding relation of the port of the Spoke CE of local branch site and is configured to the central site forward table.

5. method according to claim 3, it is characterised in that also include：

The Spoke ED detect that this equipment connects the state of the EVI-Link of described two Hub ED；

When the EVI-Link failures of the primary Hub ED of this equipment connection are detected, the Spoke ED turn the branch site An EVI-Link interfaces in delivering are revised as the 2nd EVI-Link interfaces, wherein, the 2nd EVI-Link interfaces are corresponding to this Equipment connects the EVI-Link of standby Hub ED；

The Spoke ED by the VLAN of the ether network packet for receiving identify and source MAC with receive the ether network packet The corresponding relation of port be configured to the central site forward table；Obtain EVI-Link pair that this equipment connects standby Hub ED The 2nd EVI-Link interfaces answered, by the of the VLAN of the ether network packet for receiving mark and source MAC and acquisition The corresponding relation of two EVI-Link interfaces is configured to the branch site forward table；Generate and carry the VLAN marks and the source The MAC Address synchronization message of MAC Address, EVI is encapsulated as according to the 2nd EVI-Link interfaces by the MAC Address synchronization message of generation Message is simultaneously sent to standby Hub ED；

The Spoke ED receive the EVI messages from standby Hub ED, and the EVI messages for receiving are descapsulated into into MAC Address Synchronization message；The corresponding 2nd EVI-Link interfaces of EVI-Link that this equipment connects standby Hub ED are obtained, after decapsulation The VLAN marks that carry of MAC Address synchronization message and MAC Address match somebody with somebody with the corresponding relation of the 2nd EVI-Link interfaces of acquisition Put the branch site forward table.

6. method according to claim 5, it is characterised in that also include：

When the EVI-Link for detecting the primary Hub ED of this equipment connection recovers normal, judge whether to need from standby Hub ED Switch back into primary Hub ED；

If desired primary Hub ED are switched back into from standby Hub ED, then the Spoke ED are by the branch site forward table 2nd EVI-Link interfaces are revised as an EVI-Link interfaces；

The Spoke ED generate the MAC Address of the unicast in the local branch site carried in the central site forward table And its MAC Address synchronization message of corresponding VLAN marks, the MAC Address of generation is synchronously disappeared according to an EVI-Link interfaces Breath is encapsulated as EVI messages and is sent to primary Hub ED.

7. method according to claim 1, it is characterised in that also include：

The Spoke ED receive the down state notification message that primary Hub ED send；

An EVI-Link interfaces in the branch site forward table are revised as the 2nd EVI-Link and are connect by the Spoke ED Mouthful, wherein, the 2nd EVI-Link interfaces connect the EVI-Link of standby Hub ED corresponding to this equipment；

8. method according to claim 7, it is characterised in that also include：

The Spoke ED receive the recovery upstate notification message that primary Hub ED send, and judge whether to need from standby Hub ED switch back into primary Hub ED；

9. a kind of message forwarding method, it is characterised in that the method is applied to constitute two center edge equipment of main and standby relation Any one in Hub ED, two Hub ED of this composition main and standby relation are virtually interconnected positioned at the Ethernet of Hub-Spoke frameworks The central site of EVI networks, methods described includes：

The Hub ED receive the EVI messages of the branch edge device Spoke ED from a branch site, by the EVI for receiving Message is descapsulated into ether network packet, according to the VLAN of the ether network packet after decapsulation marks and target MAC (Media Access Control) address in branch Corresponding port is found in site forwarding table, the ether network packet after decapsulation is sent in described by the port that finds The central user edge device Hub CE of center station point；

The Hub ED receive the ether network packet that the Hub CE are returned, according to the VLAN of the ether network packet for receiving marks and Target MAC (Media Access Control) address finds corresponding EVI-Link interfaces in central site forward table, is connect according to the EVI-Link for finding The ether network packet for receiving is encapsulated as EVI messages and is sent to the Spoke ED of other branch sites by mouth；

The Hub ED detect that this equipment connects the state of the EVI-Link of each Spoke ED, appoint when the connection of this equipment is detected During the EVI-Link failures of one Spoke ED, notify that other Spoke ED this equipment is unavailable, as the EVI- for detecting failure When Link recovers normal, notify that other Spoke ED this equipment recoveries are available；

The Hub ED receive the EVI messages sent from the Spoke ED of a branch site, by the EVI messages for receiving deblocking Fill as MAC Address synchronization message；

The Hub ED obtain the corresponding EVI-Link of EVI-Link of the Spoke ED of this equipment linkup transmit EVI messages and connect Mouthful；The VLAN marks that the MAC Address synchronization message is carried and the corresponding relation of MAC Address and the EVI-Link interfaces for obtaining It is configured to the central site forward table.

10. method according to claim 9, it is characterised in that also include：

The VLAN marks and MAC Address that the Hub ED carry the MAC Address synchronization message is connected the Hub with this equipment The corresponding relation of the port of CE is configured to the branch site forward table；

The Hub ED obtain the corresponding EVI-Link of EVI-Link of the Spoke ED that this equipment connects other branch sites and connect Mouthful, according to the corresponding EVI-Link interfaces of EVI-Link of the Spoke ED of connection other branch sites for obtaining by the MAC Address synchronization message encapsulates respectively and is transmitted to the Spoke ED of other branch sites again.

11. methods according to claim 9, it is characterised in that also include：

VLAN marks and broadcast MAC address are connected the Hub ED EVI- of the Spoke ED of each branch site with this equipment The corresponding relation of the corresponding EVI-Link interfaces of Link is configured to the central site forward table, and by VLAN MAC is identified and broadcast Address is connected the corresponding relation of the port of the Hub CE with this equipment and is configured to the branch site forward table.

12. a kind of apparatus for forwarding message, it is characterised in that the apparatus for forwarding message is applied to branch edge device Spoke ED, The Spoke ED are located at the branch site that the Ethernet of Hub-Spoke frameworks is virtually interconnected in EVI networks, wrap in central site Include：Two center edge equipment Hub ED of main and standby relation are formed, the apparatus for forwarding message includes：

Receiver module, for receiving ether network packet and EVI messages；

Processing module, the VLAN marks of the ether network packet for being received according to the receiver module exist with target MAC (Media Access Control) address A corresponding EVI-Link interfaces are found in branch site forward table, wherein, an EVI-Link interfaces correspond to this ED Connect the EVI-Link of primary Hub ED；The EVI messages for being additionally operable to receive the receiver module are descapsulated into Ethernet report Text, it is right to be found in central site forward table according to the VLAN of the ether network packet after decapsulation marks and target MAC (Media Access Control) address The port answered；

Sending module, the EVI-Link interfaces for being found according to the processing module receive the receiver module Ether network packet be encapsulated as EVI messages and be sent to primary Hub ED；It is additionally operable to the end found by the processing module Mouth sends the ether network packet after decapsulation；

Memory module, for preserving the branch site forward table and the central site forward table；

The processing module, the corresponding EVI-Link of EVI-Link for being additionally operable to obtain the described two Hub ED of this ED connections connect Mouthful；It is additionally operable to generate the MAC Address synchronization message for carrying the VLAN marks and source MAC；

The sending module, is additionally operable to the MAC that two EVI-Link interfaces will be generated for obtaining according to the processing module respectively Address synchronization message is encapsulated as EVI messages and sends.

13. apparatus for forwarding message according to claim 12, it is characterised in that

The processing module, the VLAN marks of the ether network packet for being additionally operable to receive the receiver module and source MAC The central site forward table is configured to the corresponding relation of the port for receiving the ether network packet；It is additionally operable to the reception To ether network packet VLAN mark and source MAC with acquisition two EVI-Link interfaces in an EVI-Link connect The corresponding relation of mouth is configured to the branch site forward table.

14. apparatus for forwarding message according to claim 12, it is characterised in that

The processing module, the EVI messages for being additionally operable to receive the receiver module are descapsulated into MAC Address synchronization message； It is additionally operable to obtain the corresponding EVI-Link interfaces of EVI-Link that this ED connects primary Hub ED, by the MAC after decapsulation The VLAN marks and MAC Address that address synchronization message is carried is configured to institute with the corresponding relation of the EVI-Link interfaces for obtaining State branch site forward table.

15. apparatus for forwarding message according to claim 12, it is characterised in that

The processing module, is additionally operable to that VLAN marks and broadcast MAC address are connected the EVI-Link of primary Hub ED with this ED The corresponding relation of a corresponding EVI-Link interfaces is configured to the branch site forward table, and by VLAN MAC is identified and broadcast Address is connected the corresponding relation of the port of the Spoke CE of local branch site with this ED and is configured to the central site forward table.

16. apparatus for forwarding message according to claim 12, it is characterised in that also include：Detection module, wherein：

The detection module, for detecting that this ED connects the state of the EVI-Link of described two Hub ED；

The processing module, is additionally operable to detect the EVI-Link failures that this ED connects primary Hub ED in the detection module When, the EVI-Link interfaces in the branch site forward table are revised as into the 2nd EVI-Link interfaces, wherein, second EVI-Link interfaces connect the EVI-Link of standby Hub ED corresponding to this ED；Be additionally operable to by the receiver module receive with The VLAN marks and source MAC and the corresponding relation of the port for receiving the ether network packet of too network packet be configured to it is described in Heart site forwarding table；It is additionally operable to obtain the corresponding 2nd EVI-Link interfaces of EVI-Link that this ED connects standby Hub ED, will The VLAN marks and source MAC of the ether network packet for receiving and the corresponding relation of the 2nd EVI-Link interfaces for obtaining It is configured to the branch site forward table；It is additionally operable to generate the carrying VLAN marks and the MAC Address of the source MAC is same Step message；The EVI messages from standby Hub ED for being additionally operable to receive are descapsulated into MAC Address synchronization message, obtain this ED connects the corresponding 2nd EVI-Link interfaces of EVI-Link of standby Hub ED, by the MAC Address synchronization message after decapsulation The VLAN marks and MAC Address of carrying is configured to the branch site and turns with the corresponding relation of the 2nd EVI-Link interfaces for obtaining Deliver；

The sending module, is additionally operable to the 2nd EVI-Link interfaces that get according to the processing module by the MAC ground for generating Location synchronization message is encapsulated as EVI messages and is sent to standby Hub ED.

17. apparatus for forwarding message according to claim 16, it is characterised in that

The processing module, the EVI-Link for being additionally operable to detect the primary Hub ED of this ED connections in the detection module recovers just Chang Shi, judges whether to need to switch back into primary Hub ED from standby Hub ED, if desired switches back into primary Hub from standby Hub ED ED, then be revised as an EVI-Link interfaces by the 2nd EVI-Link interfaces in the branch site forward table；It is additionally operable to life MAC Address and its corresponding VLAN into the unicast in the local branch site carried in the central site forward table is identified MAC Address synchronization message；

The sending module, is additionally operable to that the MAC Address that the processing module is generated synchronously is disappeared according to an EVI-Link interfaces Breath is encapsulated as EVI messages and is sent to primary Hub ED.

18. apparatus for forwarding message according to claim 12, it is characterised in that

The receiver module, is additionally operable to receive down state notification message；

The processing module, is additionally operable to receive the down state notification message that primary Hub ED send in the receiver module Afterwards, the EVI-Link interfaces in the branch site forward table are revised as into the 2nd EVI-Link interfaces, wherein, second EVI-Link interfaces connect the EVI-Link of standby Hub ED corresponding to this ED；Be additionally operable to by the receiver module receive with The VLAN marks and source MAC and the corresponding relation of the port for receiving the ether network packet of too network packet be configured to it is described in Heart site forwarding table；It is additionally operable to obtain the corresponding 2nd EVI-Link interfaces of EVI-Link that this ED connects standby Hub ED, will The VLAN marks and source MAC of the ether network packet for receiving and the corresponding relation of the 2nd EVI-Link interfaces for obtaining It is configured to the branch site forward table；It is additionally operable to generate the carrying VLAN marks and the MAC Address of the source MAC is same Step message；The EVI messages from standby Hub ED for being additionally operable to receive are descapsulated into MAC Address synchronization message, obtain this ED connects the corresponding 2nd EVI-Link interfaces of EVI-Link of standby Hub ED, by the MAC Address synchronization message after decapsulation The VLAN marks and MAC Address of carrying is configured to the branch site and turns with the corresponding relation of the 2nd EVI-Link interfaces for obtaining Deliver；

19. apparatus for forwarding message according to claim 18, it is characterised in that

The receiver module, is additionally operable to receive and recovers upstate notification message；

The processing module, is additionally operable to receive the recovery upstate that primary Hub ED send in the receiver module and notifies to disappear After breath, judge whether to need to switch back into primary Hub ED from standby Hub ED, if desired switch back into from standby Hub ED primary Hub ED, then be revised as an EVI-Link interfaces by the 2nd EVI-Link interfaces in the branch site forward table；Also use In the MAC Address and its corresponding VLAN that generate the unicast in the local branch site for carrying in the central site forward table The MAC Address synchronization message of mark；

The sending module, is additionally operable to that the MAC Address synchronization message of generation is encapsulated as into EVI reports according to an EVI-Link interfaces Text is simultaneously sent to primary Hub ED.

20. a kind of apparatus for forwarding message, it is characterised in that the apparatus for forwarding message is applied to constitute two centers of main and standby relation Any one in edge device Hub ED, two Hub ED of this composition main and standby relation are located at the Ethernet of Hub-Spoke frameworks The central site of virtual interconnection EVI networks, the apparatus for forwarding message includes：

Receiver module, for receiving EVI messages and ether network packet；

Processing module, the EVI messages for the receiver module to be received are descapsulated into ether network packet, after decapsulation Ether network packet VLAN mark and target MAC (Media Access Control) address corresponding port is found in branch site forward table；And use Look in central site forward table in the VLAN marks and target MAC (Media Access Control) address of the ether network packet received according to the receiver module Find corresponding EVI-Link interfaces；

Sending module, for sending the ether network packet after decapsulation by the port that the processing module finds；And root The ether network packet that the EVI-Link interfaces found according to the processing module receive the receiver module is encapsulated as EVI messages And send encapsulation after EVI messages；

Notification module, for when the detection module detects this ED and connects the EVI-Link failures of any one Spoke ED, Notify that other Spoke ED this ED is unavailable, when the EVI-Link that the detection module detects failure recovers normal, notifies Other Spoke ED this ED recoveries are available；

Memory module, for preserving branch site forward table and central site forward table；

The processing module, the EVI messages for being additionally operable to receive the receiver module are descapsulated into MAC Address synchronization message, obtain Take the corresponding EVI-Link interfaces of EVI-Link of the Spoke ED of this ED linkup transmits EVI messages；It is additionally operable to the MAC Address synchronization message carry VLAN mark and MAC Address with acquisition EVI-Link interfaces corresponding relation be configured to it is described in Heart site forwarding table.

21. devices according to claim 20, it is characterised in that

The processing module, is additionally operable to be connected the VLAN marks and MAC Address of MAC Address synchronization message carrying with this ED The corresponding relation of the port of the central user edge device Hub CE of the central site is configured to the branch site forward table； It is additionally operable to obtain the corresponding EVI-Link interfaces of EVI-Link of the Spoke ED that this ED connects other branch sites；

The sending module, is additionally operable to the EVI- of the Spoke ED for connecting other branch sites according to processing module acquisition The corresponding EVI-Link interfaces of Link, by the MAC Address synchronization message EVI reports after encapsulation again are encapsulated respectively and send again Text.

22. devices according to claim 20, it is characterised in that

The processing module, is additionally operable to that VLAN marks and broadcast MAC address are connected the Spoke of each branch site with this ED The corresponding relation of the corresponding EVI-Link interfaces of EVI-Link of ED is configured to the central site forward table, by VLAN mark and Broadcast MAC address is connected the corresponding relation of the port of Hub CE with this ED and is configured to the branch site forward table.