CN101340380B - Method and apparatus for uninterrupted forwarding of bi-directional forwarding detection in master-slave switch implementation - Google Patents
Method and apparatus for uninterrupted forwarding of bi-directional forwarding detection in master-slave switch implementation Download PDFInfo
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Abstract
The invention discloses a method for realizing no interrupted forwarding of bidirectional forwarding detection (BFD) packet in active/standby changeover, which is applied to the technical field of IP network communication; when the active/standby changeover is carried out, the changeover terminal notifies the opposite terminal, and the BFD session management of the changeover terminal fails; the BFD session between the changeover terminal and the opposite terminal is stopped temporarily; after the active/standby changeover ends, the changeover terminal establishes a new BFD session to the opposite terminal, and the BFD session from the changeover terminal to the opposite terminal takes effect. The invention also provides a device for realizing no interrupted forwarding of BFD packet in the active/standby changeover, so as to realize no interrupted forwarding in the active/standby changeover supported by BFD.
Description
Technical field
The present invention relates to IP network communication technical field, relate in particular to a kind of BFD of realization (two-way converting detects, Bidirectional Forwarding Detection) and support without the method and apparatus that interrupts forwarding (NSF, NoStop Forwarding).
Background technology
In network communication, for the fastest best forward-path of selecting that can be faster and better, increasing for the demand of rapid detection communication failures between adjacent system, and seem more and more for important.
In the situation that not having hardware signal to send, in former Routing Protocol, conventionally adopt the detecting mechanism that sends HELLO (a kind of message of detecting link) message, but under the detecting mechanism of HELLO message, the detecting time is generally all greater than 1 second, but this time is just oversize for some special application, the Link State that cannot detect and find to occur at short notice, and when Routing Protocol is not in running status time, HELLO message mechanism is not supported yet, so just produced a kind of detection method of setting up a paths between two-way routing engine---BFD.
An effect of BFD is between adjacent forwarding engine (comprising interface, data link and the expansion engine that some are possible), by setting up path (path), provides a kind of low load, the inefficacy method for detecting in short detecting cycle.Another one effect be to provide a kind of can be in any protocol level, the independently detecting mechanism of moving on any medium, and in order to meet different detecting demands, avoid the existence of multiple BFD method, also provide multiple choices for detecting time (detection times) and header (overhead) to user.
BFD is whether the communication condition for detecting between the current communication apparatus of forwarding plane and the communication apparatus of down hop is normal, if so be in the system of independently separating at forwarding plane and control plane, BFD is generally designed in and carries out work on forwarding plane.Certainly be not that restriction says that the agreement of BFD can only be placed on forwarding plane, contrary sometimes in order to reduce BFD to the impact of Routing Protocol (a lot of because BFD exists in detecting " restart " [graceful restart] mechanism), BFD also can be designed in control plane.
BFD message transmits between two systems, generally adopts the mode of point-to-point clean culture to carry out.BFD message is no matter be to be all applicable to transmission medium and network use by any protocol encapsulation.BFD may operate in multifaceted system.The BFD message of any special content all can be encapsulated accordingly.
BFD carries out real-time failure detection for polytype system, comprising direct-connected physical system (direct physical links), virtual circuit (VC), tunnel (tunnels), MPLS (exchange of Multiprotocol Label Switching multi protocol label), LSP (LabelSwitched Path, label switched path), multipath passage and link that some are unidirectional (current prerequisite is that these unidirectional links exist the path that can return).When there is mulitpath between two systems, in these two adjacent systems, can there are a plurality of BFD Session (session).
No matter when a BFD Session state DOWN (inefficacy), BFD state machine all adopts the mechanism of three-way handshake (three-way handshake) just to connect, thereby whether the state of the current link of reporting system timely that guarantees changes.
BFD can be counted as a kind of simple service.BFD service can create, delete, upgrade for BFD Session operation by other parameter of destination address and some.
BFD can be regarded as a kind of simple HELLO message protocol, in a lot of relevant fields, the detecting part in the well-known Routing Protocol of its extraordinary image., if a system does not receive the BFD message that the other side sends within a period of time, having there is problem with regard to explanation in the two-way approach between these two systems in the transmission BFD message in a pair of system cycle between the link of setting up mutually, causes communication failures so.But in some cases, system, in order to reduce expense, can stop sending the message of periodic BFD.
Each communication path is all corresponding generates a BFD Session, and between these two systems the BFD message of transmitted data protocol.
Each system can be assessed the transmission of oneself and accept the speed of BFD message, and holds consultation by the speed estimating of oneself and the system of opposite end, and reaches the transmission rate of the BFD detection messages of final use.In order to adapt to some special situations, these estimations for the transmitting-receiving message ability of own system will be by real-time renewal.Design allows a shared same physical link of system slowly system relative to fast like this, and can make system fast accelerate detecting speed, can make on the contrary the maximized detectability of having given play to oneself of system relatively slowly.
The existence of a BFD Session is based on this BFD Session institute supported protocol type, because BFD message itself is not to be with discovery mechanism.BFD Session with OSPF (Open Shortest Path First, exploitation OSPF) is example, and the discovery of the peer-to-peer system of this BFD Session is to adopt the HELLO agreement of OSPF to realize.
BFD provides two operator schemes to select for everybody, wherein pattern is an asynchronous mode, deposits under asynchronous mode, and the transmission BFD in native system cycle is to another system, if a series of such messages are not received by peer-to-peer system, this BFD Session will DOWN. so
Another pattern is demand model (Demand mode), under this pattern, each system has a path that oneself is independently communicated to opposite end to verify, after a BFD Session connects foundation, system will stop sending BFD and detect bag, only have when any one system wherein and send when needing BFD to detect, just have a small amount of BFD message and be sent out between system.
The basic functional principle of BFD session establishment as shown in Figure 1.Wherein,
1:OSPF neighbours set up:
2:OSPF triggers the BFD module initialization BFD session of local terminal when sending HELLO
3: by the three-way handshake of backfence BFD, set up BFD session:
The basic functional principle of BFD fault detect as shown in Figure 2, wherein,
1: link breaks down
2:BFD detects fault, and BFD neighbours cancel
3:BFD notifies the application module of its support to connect chain rupture
The application OSPF that 4:BFD supports notifies neighbours chain rupture
Distribution router comprises independently board of polylith conventionally, every board has own complete system, and different boards has the division of labor separately, a common distribution router has active and standby two master board (MP, Main Processor), polylith is with the line card (line card) of network processing unit (NP, NetworkProcessor).Main MP is mainly responsible for the work such as the control, oam of agreement, and standby MP is mainly when main MP breaks down, and for substituting the work of main MP, line card is mainly responsible for the forward process work of data message.
The framework of BFD on distributed apparatus normally all preserved a session on MP and line card, and synchronous by between master board and line card guarantees the consistency of session.
During current distributed system masterslave switchover, the BFD session meeting of the side of switching re-creates after deleting again, the side of switching can cause the BFD of opposite end to detect unsuccessfully to the deletion of local terminal session, cause opposite equip. to make FRR (Fast Reroute, quick heavy-route) switch, affect the converting flow of opposite equip..For realizing NSF usual way, be to realize Hot Spare between active and standby MP, to BFD, session is done real-time synchronous, while breaking down to meet the main MP of distributed system, take over seamlessly during masterslave switchover, do not affect the protocol status on network processing unit, opposite equip. does not carry out FRR, does not affect the traffic forwarding of opposite end.
According to traditional method that realizes NSF by Hot Spare, need to be between active and standby control board the corresponding list item of real-time synchronization and protocol status, level and smooth with what guarantee to switch.But, this mode implements very complicated, because the state machine of BFD agreement triggers variation by receiving corresponding message, when session number is more, real-time synchronization can be because receive that message is too much, information receiving and transmitting frequently occurs abnormal, indivedual sessions there will be concussion, trigger FRR and switch, and still can affect traffic forwarding.
Summary of the invention
The present invention proposes a kind of brand-new method and apparatus of realizing BFD support NSF, in the time of can effectively avoiding masterslave switchover, link concussion problem, has guaranteed link stability.The present invention has strengthened the reliability of distribution router, by line card, sends the session status that message maintains forwarding plane, avoids unnecessary route handoff, the problem of flow shakiness while having solved distribution router masterslave switchover.
The present invention is by the following technical solutions:
Realize two-way converting in masterslave switchover and detect bag without a method of interrupting forwarding, comprise following processing procedure:
1), during masterslave switchover, the two-way converting inspection session management of switching terminal notice opposite end switching terminal was lost efficacy;
2) suspend the two-way converting inspection session of switching terminal and opposite end;
3) masterslave switchover finishes, and switching terminal is created to the new two-way converting inspection session of opposite end, and the two-way converting inspection session of switching terminal and opposite end comes into force.
Preferably, described step 1) specifically comprise following processing procedure:
11) switching terminal sends to opposite end and comprises that the two-way converting of management failure state information detects bag;
12) opposite end receives that this two-way converting detects after bag, is set to inefficacy by the two-way converting inspection session state of local terminal;
13) opposite end by logout is: neighbours notify management to lose efficacy; And the processing policy of setting this event is: do not notify two-way converting to detect the upper layer application of binding.
Preferably, described step 2) specifically comprise following processing procedure:
21) switching terminal is deleted the two-way converting inspection session on local terminal;
22) switching terminal stops regularly to opposite end, sending two-way converting detection bag;
23) opposite end is when two-way converting inspection session state is set to inefficacy, and the upper layer application that stops initiate notification two-way converting detection binding is carried out quick heavy-route switching.
Preferably, described step 3) specifically comprise following processing procedure:
31) masterslave switchover finishes, and switching terminal creates and send state information for the control message that lost efficacy is to opposite end according to configuration information;
32) opposite end is received and is controlled after message the two-way converting inspection session state of local terminal by failover to initial condition INIT, the control message that is simultaneously INIT to switching terminal transmission state information;
33) switching terminal is received and is controlled after message the two-way converting inspection session state of local terminal by failover to coming into force;
34) switching terminal and opposite end come into force the two-way converting inspection session at two ends by controlling message negotiation.
Realize two-way converting in masterslave switchover and detect bag without a device that interrupts forwarding, comprising:
Switching terminal, for when the masterslave switchover, the two-way converting inspection session management of notice opposite end switching terminal was lost efficacy, and suspended the two-way converting inspection session of switching terminal; And for when masterslave switchover finishes, be created to the new two-way converting inspection session of opposite end, initiate message negotiation;
Opposite end, for when the active and standby switching, suspends the two-way converting inspection session of local terminal according to the management failure state information of switching terminal; And for when masterslave switchover finishes, according to the two-way converting inspection session information of switching terminal, carry out state switching and message negotiation.
Preferably, when masterslave switchover, switching terminal is specially and by sending to opposite end, comprises that the two-way converting of management failure state information detects the notice that bag is realized fail message, opposite end is specially according to the management failure state information of switching terminal the two-way converting inspection session state of local terminal is set to inefficacy, and be recorded as neighbours and notify management failure event, the processing policy of corresponding event is: do not notify two-way converting to detect the upper layer application of binding.
Preferably, when masterslave switchover finishes, switching terminal is specially according to configuration information and creates and send state information for the control message that lost efficacy is to opposite end, startup message negotiation process; Opposite end is specially the two-way converting inspection session state that switches local terminal according to the control message of receiving, the message negotiation process of response switching terminal.
The present invention can notify the other side's local terminal BFD session management DOWN by sending the BFD packet of AdminDown (management was lost efficacy) state by switching terminal, opposite end session status becomes after AdminDown, the equipment of opposite end just can not given out a contract for a project to do regularly and detected, when switching terminal is deleted on this terminal wiring card corresponding session more afterwards, upper layer application just can not notified in opposite end, can not carry out FRR switching yet.Thereby realize BFD and support forwarding without interrupting in masterslave switchover.
Accompanying drawing explanation
Fig. 1 is the basic functional principle schematic diagram of existing BFD session establishment;
Fig. 2 is the basic functional principle schematic diagram that existing BFD session failure detects;
Fig. 3 is the networking schematic diagram of specific implementation process of the present invention;
Fig. 4 is step and the state variation schematic diagram that BFD supports NSF specific implementation process.
Embodiment
Below in conjunction with accompanying drawing, the enforcement of technical scheme is described in further detail:
The device of realizing two-way converting detection bag nothing interruption forwarding in masterslave switchover of the present invention is mainly comprised of switching terminal and opposite end.
Switching terminal wherein, for when the masterslave switchover, the two-way converting inspection session management of notice opposite end switching terminal was lost efficacy, and suspended the two-way converting inspection session of switching terminal; And for when masterslave switchover finishes, be created to the new two-way converting inspection session of opposite end, initiate message negotiation;
Opposite end, for when the active and standby switching, suspends the two-way converting inspection session of local terminal according to the management failure state information of switching terminal; And for when masterslave switchover finishes, according to the two-way converting inspection session information of switching terminal, carry out state switching and message negotiation.
When masterslave switchover, switching terminal comprises that by sending to opposite end the two-way converting of management failure state information detects the notice that bag is realized fail message, opposite end is set to inefficacy according to the management failure state information of switching terminal by the two-way converting inspection session state of local terminal, and be recorded as neighbours and notify management failure event, the processing policy of corresponding event is: do not notify two-way converting to detect the upper layer application of binding.
When masterslave switchover finishes, switching terminal creates and sends state information for the control message that lost efficacy is to opposite end according to configuration information, startup message negotiation process; The two-way converting inspection session state of local terminal is switched in opposite end according to the control message of receiving, the message negotiation process of response switching terminal.
Specific embodiment as shown in Figure 3, hardware is comprised of router or the three-tier switch of two distributed support BFD functions.Chief component mainly comprises router device R1, the R2 that supports BFD function, and reserve link forwarding router R3, requires R1 equipment to support configuring static route and BFD linkage function simultaneously, supports IP FRR function.On the interface being connected with Access Network at R1 equipment, configure two static routing, specify different priority, the down hop of high priority is pointed to the interface IP address (142.0.0.2) of R2 equipment, the down hop of inferior priority is pointed to the interface IP address that R3 equipment is connected with R1, in R1 and R2 equipment room configuration BFD session, primary link under normal circumstances, while accessing the packet process R1 of remote equipment by Access Network, by R1-R2, forward, by BFD session, guaranteed the accessibility of R1-R2 link simultaneously, once the link fails of R1-R2, the FRR that comes notification strategy route to complete route by BFD switches, during packet process R1, by R1-R3, forwarded.BFD supports that the core of NSF is that the FRR that R1-R2 link will not occur in R1 masterslave switchover switches.
BFD as shown in Figure 4 supports NSF handling process, and step is as follows:
Step 201: the binding of configuring static route next jump and BFD, set up BFD session, after session negotiation success, state becomes UP;
In order to realize the BFD of static routing down hop configuration, detect, first need to specify multi-next-hop in equipment side configuring static route, priority is different simultaneously, the down hop that need to generate main and standby relation when configuration and BFD session association, at this moment can tentatively generate the main and standby relation of configuration according to IP FRR.After BFD state has been consulted, BFD session UP, BFD session has normally been set up at the two ends of connection, and now two ends send detection messages with the time interval height of 10 milliseconds to opposite end, and be 30 milliseconds detection time.
The main MP of R1 breaks down, the automatic masterslave switchover of system;
The line card of step 203:R1 is received the switching messages of master control borad, at once local terminal session status is set to management DOWN, and to opposite end, sends the message of AdminDown.
Step 204: opposite end R2 receives after AdminDown message, and the session status of oneself is set to DOWN, the time of giving out a contract for a project of simultaneously revising in session is 1 second.
Step 205: the side of switching R1 deletes the BFD session on this terminal wiring card, and R1 side stops sending BFD detection messages.
Because the session status of opposite end R2 has now been DOWN state, so forward layer, no longer detect, when can not receive the detection messages that opposite end sends over, can not detect unsuccessfully to upper strata application report yet, equally can not make the action of FRR switching yet.
End is switched by step 206:R1 side, after standby control board gets up, and the establishment of initiation session again of the standby control board of R1;
Step 207:R2 side state is reactivated by R1 side for managing the session of DOWN, two ends session UP.
In whole process, R1-R2 end is not made the action that FRR switches all the time, therefore the forwarding of the data flow of R1-R2 end is not affected.
In sum, the problem of the route handoff flow interrupt that the present invention may cause while effectively having solved the BFD masterslave switchover of current distribution router, by the state machine of flexible Application BFD agreement, for BFD provides the function of supporting NSF, strengthened the BFD reliability of data retransmission in distributed system.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (5)
1. realize two-way converting in masterslave switchover and detect bag without a method of interrupting forwarding, it is characterized in that, described method comprises following processing procedure:
1) during masterslave switchover, switching terminal sends two-way converting inspection session management fail message to opposite end, and suspends the two-way converting inspection session of local terminal;
2) two-way converting inspection session of local terminal is suspended in opposite end according to the management failure state information of described switching terminal;
Switching terminal is deleted the two-way converting inspection session on local terminal;
3) masterslave switchover finishes, and switching terminal is created to the new two-way converting inspection session of opposite end, specific as follows:
31) masterslave switchover finishes, and switching terminal creates and send state information for the control message that lost efficacy is to opposite end according to configuration information;
32) opposite end is received and is controlled after message the two-way converting inspection session state of local terminal by failover to initial condition INIT, the control message that is simultaneously INIT to switching terminal transmission state information;
33) switching terminal is received and is controlled after message the two-way converting inspection session state of local terminal by failover to coming into force;
34) switching terminal and opposite end come into force the two-way converting inspection session at two ends by controlling message negotiation.
2. according to claim 1ly realize two-way converting in masterslave switchover and detect bag without the method for interrupting forwarding, it is characterized in that described step 1) specifically comprise following processing procedure:
11) switching terminal sends to opposite end and comprises that the two-way converting of management failure state information detects bag;
12) opposite end receives that described two-way converting detects after bag, is set to inefficacy by the two-way converting inspection session state of local terminal;
13) opposite end by logout is: neighbours notify management to lose efficacy; And the processing policy of setting described event is: do not notify two-way converting to detect the upper layer application of binding.
3. according to claim 2ly realize two-way converting in masterslave switchover and detect bag without the method for interrupting forwarding, it is characterized in that described step 2) specifically comprise following processing procedure:
21) switching terminal is deleted the two-way converting inspection session on local terminal;
22) switching terminal stops regularly to opposite end, sending two-way converting detection bag;
23) opposite end is when two-way converting inspection session state is set to inefficacy, and the upper layer application that stops initiate notification two-way converting detection binding is carried out quick heavy-route switching.
4. realize two-way converting in masterslave switchover and detect bag without a device that interrupts forwarding, it is characterized in that, described device comprises:
Switching terminal, for when the masterslave switchover, sends two-way converting inspection session management fail message to opposite end, suspends the two-way converting inspection session of local terminal and for deleting the two-way converting inspection session on local terminal;
And for when masterslave switchover finishes, be created to the new two-way converting inspection session of opposite end, and initiate message negotiation, be specially: according to configuration information, creates and send state information for the control message that lost efficacy is to opposite end, startup message negotiation process; And after the state information of receiving opposite end feedback is the control message of initial condition INIT, by the two-way converting inspection session state of local terminal by failover to coming into force;
Opposite end, for when the active and standby switching, suspends the two-way converting inspection session of local terminal according to the management failure state information of switching terminal; And for when masterslave switchover finishes, according to the two-way converting inspection session information of switching terminal, carry out state switching and message negotiation, be specially: after receiving that state information that switching terminal sends is for the control message losing efficacy, by the two-way converting inspection session state of local terminal by failover to initial condition INIT, to switching terminal, send the control message that state information is INIT, the message negotiation process of response switching terminal simultaneously.
5. according to claim 4ly realize two-way converting in masterslave switchover and detect bag without the device that interrupts forwarding, it is characterized in that, when masterslave switchover, switching terminal is specially and by sending to opposite end, comprises that the two-way converting of management failure state information detects the notice that bag is realized fail message, opposite end is specially according to the management failure state information of switching terminal the two-way converting inspection session state of local terminal is set to inefficacy, and be recorded as neighbours and notify management failure event, the processing policy of corresponding event is: do not notify two-way converting to detect the upper layer application of binding.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102195861B (en) * | 2010-03-19 | 2015-04-08 | 杭州华三通信技术有限公司 | Method and device for establishing BFD (bidirectional forwarding detection) session in route switching process |
| CN101860491B (en) * | 2010-06-23 | 2013-08-14 | 迈普通信技术股份有限公司 | Aggregation type link bidirectional forwarding detection method and device thereof |
| CN101984573B (en) * | 2010-11-15 | 2015-07-22 | 中兴通讯股份有限公司 | Method and system for distributed realization of LACP standard state machine |
| CN102025562A (en) * | 2010-11-25 | 2011-04-20 | 中兴通讯股份有限公司 | Path detection method and device |
| CN103490951A (en) * | 2013-09-09 | 2014-01-01 | 神州数码网络(北京)有限公司 | Bidirectional forwarding detection method in multi-hop link on basis of BFD |
| CN105490867A (en) * | 2014-10-09 | 2016-04-13 | 中兴通讯股份有限公司 | Bidirectional forwarding detection control method and device |
| CN106301840B (en) * | 2015-05-27 | 2020-09-15 | 中兴通讯股份有限公司 | Method and device for sending Bidirectional Forwarding Detection (BFD) message |
| CN107623607B (en) * | 2016-07-15 | 2020-04-03 | 新华三技术有限公司 | BFD session connection establishment method and device |
| CN106878051B (en) * | 2016-12-16 | 2020-10-09 | 新华三技术有限公司 | Multi-machine backup implementation method and device |
| CN109462557A (en) * | 2018-10-15 | 2019-03-12 | 江西山水光电科技股份有限公司 | The backup method of BFD session on a kind of active and standby master control borad |
| CN110086690B (en) * | 2019-04-30 | 2021-06-15 | 新华三技术有限公司 | Bidirectional forwarding detection method and device, electronic equipment and readable storage medium |
| CN110224886B (en) * | 2019-05-31 | 2021-02-09 | 新华三技术有限公司 | Tunnel connectivity detection method and device and network edge equipment |
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