CN1881885A - Network switching equipment and network service protection method - Google Patents
Network switching equipment and network service protection method Download PDFInfo
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- CN1881885A CN1881885A CN 200510035367 CN200510035367A CN1881885A CN 1881885 A CN1881885 A CN 1881885A CN 200510035367 CN200510035367 CN 200510035367 CN 200510035367 A CN200510035367 A CN 200510035367A CN 1881885 A CN1881885 A CN 1881885A
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Abstract
The invention relates to a network exchange device and a network service protect method, wherein it comprises two exchange network plates which are back-up to each other; and it is arranged with at least one couple of interface plates which are back-up to each other; each interface plate is arranged with service interface and electric switch to connect the electric switch of another interface plate via bidirectional chain circuits; the ascending service flow, via exchange network plate, is ascending to the main interface plate to be copied into two deals, while one deal is ascending via the main interface plate, and another deal is ascending to the back-up interface plate; the descending service flow via the main interface plate is descending to the main exchange network plate; the descending service flow of back-up interface plate is thrown out. The invention can realize the service protection of exchange network plate, the interface plate and the circuit, to avoid the linked exchange between the device, to reduce the service exchange time.
Description
Technical field
The present invention relates to the communication network technology field, be specifically related to a kind of network switching equipment and network service protection method.
Background technology
In order to satisfy the demand that people " link up accessible ", the top priority of communication network guarantees its high reliability exactly, and should there be any Single Point of Faliure in a carrier-class network.But at the edge of communication network, just between Access Layer and convergence-level, general is connected by a physical link, if the device fails of this link or both link ends, the following user of whole access device can't obtain service.
As shown in Figure 1, existing DSLAM (Digital Subscriber Line Access Multiplexer) access device, at up direction generally is to link to each other with convergence device by optical fiber such as ATM155 (asynchronous transfer mode 155 interfaces), ATM622 (asynchronous transfer mode 622 interfaces), E3, IMA E1, FE (fastethernet interface), GE (gigabit ethernet interface) or T bit Ethernet interface or cable mode, and be single physical link generally speaking, when physical link fault or interface board fault take place, the following customer service of whole DSLAM equipment will all be interrupted.
Generally speaking, under the DSLAM several thousand users are arranged, influence and economic loss that up link interrupts being brought well imagine, a kind of means that up link and relevant interface plate are protected of operator's urgent need.In real system; that protects is not only up link and interface board; also have internet exchange system (is that example describes with the master control borad that contains the network board function), require all will protect master control borad (containing the network board function), interface board, up link.Moreover, to switching time in addition than higher requirement.
Fig. 2 has introduced a kind of existing protection scheme; in this scheme; directly go out up going port by master control borad; master control borad has two; active and standby each other, active and standby plate has a up going port respectively, and it is up externally to pool a physical link by optical splitter; can protect under the situation of a master control borad fault so therein and switch, and be unlikely to make service outage duration oversize.
If main control board breaks down to the optical fiber between the optical splitter, will cause the linking switching of slave control board, but there is following limitation in this scheme:
1) if the optical fiber that two master control borads come out breaks down, can't carry out service protection after optical splitter merges;
2) when the optical fiber of main control board between optical splitter breaks down, if the data sync of active and standby two master control borads is insufficient, do not allow to switch, have only and wait for after data sync is fully and just can switch, switching time can be long like this, can't realize professional quick switching.
Fig. 3 has introduced existing second kind of protection scheme, and in this scheme, local terminal equipment directly goes out up going port by master control borad, and master control borad has two, and is active and standby each other.Main control board and slave board master control borad go out a up going port respectively, link to each other with the slave board master control borad with the main control board of opposite equip. by optical fiber, and this scheme can be carried out the protection of optical fiber and master control borad.
When the optical fiber that connects main control board breaks down, require active and standby two master control borads also will carry out linking switching, but also there is following limitation in second kind of protection scheme:
1) after at one end equipment is switched, require opposite equip. also to want linking switching;
2) under the inadequate situation of the data sync of active and standby master control borad, can not carry out masterslave switchover, could carry out after having only by the time data sync fully and switch, switching time is understood long in this case;
3) carry out the masterslave switchover first time after, originally main control board is reduced to standby plate, and can reset simultaneously, normal its business configuration of basis of time what it recovers, from a few minutes to the dozens of minutes, do not wait, if during this period of time the optical fiber that current main control board connected breaks down, even the optical fiber that this moment, current slave control board connected recovers, can not carry out immediately and switch for the second time, could carry out after must waiting the slave control board startup and recovering normally and switch.
Summary of the invention
Technical problem to be solved by this invention provides a kind of network switching equipment and network service protection method, and the service protecting method that overcomes prior art needs terminal device linking switching and the long shortcoming of switching time.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
This network switching equipment, it comprises two active and standby each other network boards, also is provided with at least one pair of active and standby each other interface board in the described network switching equipment, is respectively arranged with business interface on each interface board; Electronic switch also is set respectively on each interface board, each electronic switch is connected with each network board by two-way link respectively, and be connected to the business interface of this interface board by two-way link, also be connected with electronic switch on active and standby each other another interface board by two-way link.
Described electronic switch can adopt the full intersection electronic switch with 4 inputs and 4 outputs.The described network switching equipment can be a Digital Subscriber Line Access Multiplexer.Described business interface comprises asynchronous transfer mode 155 interfaces, asynchronous transfer mode 622 interfaces, E3 interface, IMA E1 interface, fastethernet interface, G bit Ethernet interface or T bit Ethernet interface.
Corresponding a kind of network service protection method, at least one pair of active and standby each other interface board is set in the network switching equipment, each interface board is connected with opposite equip. by business interface respectively, each interface board also is connected with active and standby each other two network boards in the network switching equipment respectively, and be connected with active and standby each other another interface board, the Business Stream transfer step is as follows: spare interface board when stand-by state with its with active and standby two network boards between be connected disconnection; When sending Business Stream, send to the main interface board of use with network board, be duplicated into two parts on interface board, aly continue to send with interface board by main main by main, another part by the physical link between interface board to spare interface board continuation transmission; When receiving Business Stream, directly be sent to the main network board of use by main with interface board, the Business Stream that spare interface board receives from business interface is on the spare interface board or be sent to the master by the physical link between interface board and abandon with interface board.
Electronic switch can be set respectively on each interface board, by each electronic switch respectively by two-way link and the business interface of each network board, this interface board, the electronic switch on active and standby another interface board is connected each other; And duplicate sending Business Stream by described electronic switch, the Business Stream that receives from business interface is abandoned.
Main with interface board after detecting connected external circuit and breaking down, carry out switching services; The main physical link interruption that is connected with new spare interface board with network board behind the switching services, the master connects with the new main physical link that is connected with interface board with network board; Send Business Stream and copy to new spare interface board new master on interface board, the new main Business Stream that receives from business interface with interface board directly is sent to the main network board of use, and newly spare interface board is dropped from the business that business interface receives.
When the master breaks down with interface board, carry out switching services; The main physical link that is connected with new spare interface board with network board interrupts behind the switching services, leads with network board and connects with the physical link that interface board is connected with new master; Send Business Stream and copy to new spare interface board new master on interface board, the new main Business Stream that receives from business interface with interface board directly is sent to the main network board of use, and newly spare interface board is dropped from the business that business interface receives.
When the master breaks down with network board, carry out switching services; The new main physical link interruption that is connected with spare interface board with network board behind the switching services, new main with network board and the main physical link connection that is connected with interface board; Send Business Stream and send with network board from new master, copy to spare interface board main on interface board, the main Business Stream that receives from business interface with interface board is sent to the new main network board of use, and spare interface board is dropped from the business of business interface reception.
Beneficial effect of the present invention is: the invention provides a kind of network switching equipment and network service protection method; by setting up network board, the two active and standby mechanism of interface board; can realize that network board, interface board, circuit too many levels failure condition service protection switch; strengthened professional reliability greatly, with the reliability of the network switching equipment.Simultaneously, the present invention does not require the linking switching of terminal device by adopting dual transmitting and receiving mechanism, does not require the master control borad linking switching under the line fault situation yet.Like this; just there has not been the negotiations process of terminal device yet; do not need the agreement support; shortened switching time greatly; it all is to finish on interface board that simultaneous faults detects with switching ruling; participate in without master control borad; do not need message to send yet; testing process is also by interrupting realization; can be very fast so switch, can satisfy less than the requirement of 50ms switching time, accomplish to switch the business of not influencing; improved professional survival ability, can support that upstream Interface is ATM155; ATM622; E3; IMAE1; FE; GE; the protection of type physical interfaces such as T bit Ethernet interface is switched.
Description of drawings
Fig. 1 is a prior art single physical link access network architecture schematic diagram;
Fig. 2 is a prior art optical splitter scenario-frame schematic diagram;
Fig. 3 is a prior art linking switching scenario-frame schematic diagram;
Fig. 4 is the networking structure schematic diagram that the present invention carries out service protection;
Fig. 5 is a network switching equipment Business Stream schematic diagram of the present invention;
Fig. 6 a is the 4*4 electronic switch schematic diagram that adopts in the interface board of the present invention;
Fig. 6 b is each interface annexation schematic diagram of electronic switch of the present invention;
Switching services schematic diagram when Fig. 7 is the main usefulness of the present invention interface board line fault;
Fig. 8 a is main with electronics switch connection status schematic diagram before the switching services of the present invention;
Fig. 8 b is a standby electronic switch connection status schematic diagram before the switching services of the present invention;
Standby electronic switch connection status schematic diagram when Fig. 9 a is the main usefulness of the present invention interface board line fault behind the switching services;
The main electronics switch connection status schematic diagram of using when Fig. 9 b is the main usefulness of the present invention interface board line fault behind the switching services;
Switching services schematic diagram when Figure 10 is the main usefulness of the present invention interface board fault;
Switching services schematic diagram when Figure 11 is a master control borad fault of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
In the present invention; by introducing a kind of mechanism; go up the service protection of realizing under network board (is that example describes with the master control borad that contains the network board function), interface board, the line fault situation at the network switching equipment (is that example describes with DSLAM); protection scheme adopts dual transmitting and receiving mechanism, can realize the quick protective switch under master control borad, interface board, the line fault situation.
The not the same method that directly goes out business interface that adopts of the present invention from master control borad with prior art, but at least one pair of active and standby each other interface board is set in DSLAM, be respectively arranged with upstream Interface on each interface board, on local terminal equipment, go out business interface from interface board, each interface board is respectively by physical medium (optical fiber, cable etc.) link to each other with opposite equip., networking scenario as shown in Figure 4 and Figure 5, wherein master control borad and interface board all are 1+1 backup, switching network on the master control borad is the exchcange core of DSLAM, a switching network is respectively arranged on the active and standby master control borad, and switching network links to each other with two interface boards by physical link respectively.Electronic switch also is set respectively on each interface board, each electronic switch is connected with each master control borad by two-way link respectively, and be connected to the upstream Interface of this interface board by two-way link, also be connected with electronic switch on active and standby each other another interface board by two-way link.Spare interface board is judged when oneself being stand-by state, initiatively its physical link that links to each other with two active and standby master control borads is changed to DOWN (promptly disconnecting) state, does not have the signal flow mistake on physical link under this state.
The electronic switch that a 4*4 shown in Fig. 6 a is arranged respectively on the active and standby interface board has 4 inputs, 4 outputs, and each output can select in 4 input signals any one as output, promptly is full the intersection.Fig. 6 b has shown each interface annexation schematic diagram of electronic switch of the present invention, wherein two docking ports are respectively applied for and connect two master control borads, the 3rd docking port is used for connecting the Service Processing Module of this interface board of upstream Interface, the 4th docking port is used for up service duplication to the backup interface plate, because Business Stream is two-way, in Fig. 6 b, will receive and send out to divide the expression of coming, wherein RX1, TX1 are connected to Service Processing Module, RX2, TX2 are connected to main control board, RX3, TX3 are connected to slave control board, and RX4, TX4 are connected to spare interface board.Wherein TX2 is selected from RX1, and TX1 and TX4 are selected from RX2.
The activestandby state of active and standby master control borad and active and standby interface board is by hardware logic control, and the control mode unanimity is understood the active and standby state of oneself competing out at system starting process.Up Business Stream is up to the master by main control board and uses interface board, is duplicated into two parts on electronic switch, and a by main up with interface board, the physical link that another part passes through between interface board is up to the opposite spare interface board, realizes " two ".Downstream service flow directly goes downwards to main control board by main with interface board, the downstream service flow of spare interface board abandons on leading with the electronic switch on the interface board by the physical link between plate, also can on the electronic switch of spare interface board, abandon, be equivalent to main with realizing " choosing is received " on the electronic switch of interface board.
As shown in Figure 7, main with behind the line failure of interface board, fault can be dropout (LOS), Signal Fail (SF), reception fault (AIS), far-end fault (RDI), Signal Degrade (SD) etc., the master can detect in the very first time with interface board, the main Interface status (state of spare interface board uplink service mouth can initiatively be given the main interface board of using by spare interface board) that will judge spare interface board with interface board, if spare interface board uplink service mouth state is normal, promptly initiate to switch.Switching services is to realize by the electronic switch on the switching interface plate, the switching of electronic switch is the activestandby state decision by activestandby state with the master control borad that is connected of interface board self, it is main before the switching services when Fig. 8 a is interface board of the present invention institute line road fault with electronics on off state schematic diagram, standby electronic switch view before switching services when Fig. 8 b is interface board of the present invention institute line road fault, it is main behind the switching services when standby electronics on off state schematic diagram behind switching services when Fig. 9 a is interface board of the present invention institute line road fault, Fig. 9 b are interface board of the present invention institute line road fault with electronics on off state schematic diagram.Switch the physical link that the back master control borad is connected with new spare interface board and will be changed to DOWN (promptly disconnecting), master control borad will be changed into UP (i.e. connection) state by original DOWN with the physical link that new master is connected with interface board.Uplink service will copy to new spare interface board on interface board new master, realize " two "; New main downlink business with interface board will directly go downwards to main control board, and the descending business (may not have) of new spare interface board abandons on interface board new master, realizes " choosing receipts ".
Switching services schematic diagram when Figure 10 is an interface board fault of the present invention, main reason with the interface board fault may be that interface board is pulled out, board resetting, also may be hardware damage etc., if main with the detected fault of interface board CPU energy, the master will initiatively initiate to switch with interface board; If faults such as the non-detectable single-board insert-pulls of CPU, spare interface board will automatically perform and switch.Masterslave switchover initiatively is to be switched by main program ACTIVE CONTROL hardware logic with the operation of the CPU on the interface board, auto switching might be main to detect the switching that veneer hard reset signal promptly carries out activestandby state (generally caused by hardware watchdog or user directly reset to lead cause with interface board) with the interface board hardware logic, also may be after the master is transferred to interface board, after the active and standby control logic of spare interface board detects, switch activestandby state, automatically oneself is upgraded to the main interface board of using.
Switching services is to realize that by the electronic switch on the switching interface plate situation of switching services is similar when the switching of electronic switch and interface board institute line road fault, and interface board will carry out the business switching according to the activestandby state of self and the activestandby state of master control borad.Main control board is changed to the DOWN state with the physical link that new spare interface board is connected, and main control board is changed to the UP state with the new main physical link that is connected with interface board; Uplink service will copy to new spare interface board on interface board new master, realize " two ", new main downlink business with interface board will directly go downwards to main control board, the descending business (may not have) of new spare interface board abandons (also can abandon) on the electronic switch of new spare interface board on new main electronic switch with interface board, realize " choosing is received ".
Switching services schematic diagram when Figure 11 is a master control borad fault of the present invention, the reason of main control board fault may be that interface board is pulled out, board resetting, it also may be hardware damage etc., if the detected fault of main control board CPU energy, main control board will initiatively initiate to switch, if faults such as non-detectable fault of CPU such as single-board insert-pulls, slave control board will automatically perform and switch.Masterslave switchover initiatively is to be switched by the program ACTIVE CONTROL hardware logic of the operation of the CPU on the main control board, auto switching might be the main control board hardware logic switching that detects veneer hard reset signal and promptly carry out activestandby state (generally caused by hardware watchdog or user's main control board that directly resets causes), also may be after main control board is transferred to, after the active and standby control logic of slave control board detects, switch activestandby state, automatically oneself is upgraded to main control board.Switching services is to realize by the electronic switch on the switching interface plate, and interface board will carry out the business switching according to the activestandby state of self and the activestandby state of master control borad.The physical link that new main control board is connected with spare interface board is changed to the DOWN state, and new main control board is changed to the UP state with the main physical link that is connected with interface board; Uplink service stream will be up from new main control board, and on leading, copy to spare interface board with interface board, realize " two ", main downstream service flow with interface board directly goes downwards to new main control board, downstream service flow on the spare interface board abandons (also can abandon on the electronic switch at spare interface board) on main electronic switch with interface board, realize " choosing is received ".
The present invention is by setting up the two active and standby mechanism of master control borad, interface board, can realize that master control borad, interface board, circuit too many levels failure condition service protection switch, and strengthened professional reliability greatly, with the reliability of DSLAM equipment.Simultaneously, the present invention does not require the linking switching of terminal device by adopting dual transmitting and receiving mechanism, does not require the master control borad linking switching under the line fault situation yet.Like this; just there has not been the negotiations process of terminal device yet; do not need the agreement support; shortened switching time greatly; it all is to finish on interface board that simultaneous faults detects with switching ruling; participate in without master control borad; do not need message to send yet; testing process is also by interrupting realization; can be very fast so switch, can satisfy less than the requirement of 50ms switching time, accomplish to switch the business of not influencing; improved professional survival ability, can support that upstream Interface is that the protection of type physical interfaces such as ATM155, ATM622, E3, IMAE1, FE, GE is switched.
Those skilled in the art do not break away from essence of the present invention and spirit, can there be the various deformation scheme to realize the present invention, the above only is the preferable feasible embodiment of the present invention, be not so limit to interest field of the present invention, the equivalence that all utilizations specification of the present invention and accompanying drawing content are done changes, and all is contained within the interest field of the present invention.
Claims (9)
1, a kind of network switching equipment, it comprises two active and standby each other network boards, it is characterized in that: also be provided with at least one pair of active and standby each other interface board in the described network switching equipment, be respectively arranged with business interface on each interface board; Electronic switch also is set respectively on each interface board, each electronic switch is connected with each network board by two-way link respectively, and be connected to the business interface of this interface board by two-way link, also be connected with electronic switch on active and standby each other another interface board by two-way link.
2, the network switching equipment according to claim 1 is characterized in that: described electronic switch is the full intersection electronic switch with 4 inputs and 4 outputs.
3, the network switching equipment according to claim 1 and 2 is characterized in that: the described network switching equipment is a Digital Subscriber Line Access Multiplexer.
4, the network switching equipment according to claim 3 is characterized in that: described business interface comprises asynchronous transfer mode 155 interfaces, asynchronous transfer mode 622 interfaces, E3 interface, IMA E1 interface, fastethernet interface, G bit Ethernet interface or T bit Ethernet interface.
5, a kind of network service protection method; it is characterized in that; at least one pair of active and standby each other interface board is set in the network switching equipment; each interface board is connected with opposite equip. by business interface respectively; each interface board also is connected with active and standby each other two network boards in the network switching equipment respectively; and be connected with active and standby each other another interface board, the Business Stream transfer step is as follows:
Spare interface board when stand-by state with its with active and standby two network boards between be connected disconnection;
When sending Business Stream, send to the main interface board of use with network board, be duplicated into two parts on interface board, aly continue to send with interface board by main main by main, another part by the physical link between interface board to spare interface board continuation transmission;
When receiving Business Stream, directly be sent to the main network board of use by main with interface board, the Business Stream that spare interface board receives from business interface is on the spare interface board or be sent to the master by the physical link between interface board and abandon with interface board.
6, network service protection method according to claim 5, it is characterized in that: electronic switch is set respectively on each interface board, by each electronic switch respectively by two-way link and the business interface of each network board, this interface board, the electronic switch on active and standby another interface board is connected each other; And duplicate sending Business Stream by described electronic switch, the Business Stream that receives from business interface is abandoned.
7, according to claim 5 or 6 described network service protection methods, it is characterized in that: main with interface board after detecting connected external circuit and breaking down, carry out switching services; The main physical link interruption that is connected with new spare interface board with network board behind the switching services, the master connects with the new main physical link that is connected with interface board with network board; Send Business Stream and copy to new spare interface board new master on interface board, the new main Business Stream that receives from business interface with interface board directly is sent to the main network board of use, and newly spare interface board is dropped from the business that business interface receives.
8, according to claim 5 or 6 described network service protection methods, it is characterized in that: when the master breaks down with interface board, carry out switching services; The main physical link that is connected with new spare interface board with network board interrupts behind the switching services, leads with network board and connects with the physical link that interface board is connected with new master; Send Business Stream and copy to new spare interface board new master on interface board, the new main Business Stream that receives from business interface with interface board directly is sent to the main network board of use, and newly spare interface board is dropped from the business that business interface receives.
9, according to claim 5 or 6 described network service protection methods, it is characterized in that: when the master breaks down with network board, carry out switching services; The new main physical link interruption that is connected with spare interface board with network board behind the switching services, new main with network board and the main physical link connection that is connected with interface board; Send Business Stream and send with network board from new master, copy to spare interface board main on interface board, the main Business Stream that receives from business interface with interface board is sent to the new main network board of use, and spare interface board is dropped from the business of business interface reception.
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| CNB2005100353678A CN100420187C (en) | 2005-06-17 | 2005-06-17 | Network switching equipment and network service protection method |
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| CNB2005100353678A CN100420187C (en) | 2005-06-17 | 2005-06-17 | Network switching equipment and network service protection method |
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| CN1881885A true CN1881885A (en) | 2006-12-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101610215B (en) * | 2009-07-21 | 2011-08-17 | 杭州华三通信技术有限公司 | Route forwarding method and gateway equipment |
| CN110391928A (en) * | 2018-04-20 | 2019-10-29 | 华为技术有限公司 | A kind of communication means and equipment executing active-standby switch using electronic switch |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1199400C (en) * | 2002-09-13 | 2005-04-27 | 华为技术有限公司 | Master-standby switching and load sharing system and method based on Ethernet access platform |
| CN1275415C (en) * | 2003-11-03 | 2006-09-13 | 中兴通讯股份有限公司 | Device for automatic protective switching optical interface |
| CN1588818A (en) * | 2004-08-18 | 2005-03-02 | 北京首信股份有限公司 | Method and device for realizing master and spare unit convertion on exchange port of exchanger |
-
2005
- 2005-06-17 CN CNB2005100353678A patent/CN100420187C/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101610215B (en) * | 2009-07-21 | 2011-08-17 | 杭州华三通信技术有限公司 | Route forwarding method and gateway equipment |
| CN110391928A (en) * | 2018-04-20 | 2019-10-29 | 华为技术有限公司 | A kind of communication means and equipment executing active-standby switch using electronic switch |
| CN110391928B (en) * | 2018-04-20 | 2022-01-18 | 华为技术有限公司 | Communication method and device for executing main/standby switching by using electronic switch |
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| CN100420187C (en) | 2008-09-17 |
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