CN101483592A - Method and apparatus for inhibiting bidirectional forwarding detection link oscillation - Google Patents
Method and apparatus for inhibiting bidirectional forwarding detection link oscillation Download PDFInfo
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Abstract
The invention discloses a method for inhibiting oscillation of a bidirectional forwarding detection link and a device thereof. The method comprises steps of periodically monitoring the session state of bidirectional forwarding detection (BFD) of a first device; calculating the frequency value of the BFD session state which is changed from a state through a state switch to the original state; when the frequency value is bigger than or equal to a set threshold value, the BFD session is inhibited to be switched to the next state. A problem that under a bed network station, when the BFD link enters an oscillation state, the forwarding routing is re-calculated and re-switched continuously, continuous cutoff of network will occur, is solved by using the device and method of inhibiting oscillation of the bidirectional forwarding detection link.
Description
Technical field
The present invention relates to the IP network communication technical field, relate in particular to a kind of method and device that suppresses bidirectional forwarding detection link oscillation.
Background technology
In network communication,,, and seem more and more for important at the demand of detecting communication failures is increasing fast between adjacent system for the fastest best forward-path of selecting that can be faster and better.
Under the situation that does not have hardware signal to send, in the former Routing Protocol, usually adopt the detecting mechanism that sends HELLO (a kind of message of detecting link) message, but under the detecting mechanism of HELLO message, because the detecting time interval is generally all greater than 1 second, the detecting time interval is long for some special application, can't detect and find the Link State that take place within a short period of time, and when Routing Protocol the time not in running status, also can't use HELLO message mechanism, so produced and a kind ofly (comprised interface at two-way routing engine, data link and the expansion engine that some are possible) between set up the detection method of a paths-two-way forwarding detect (Bidirectional Forwarding Detection, BFD).
The BFD method is carried out real-time failure detection at polytype system, comprising direct-connected physical system (direct physicallinks), virtual circuit (VC), tunnel (tunnels), multi protocol label exchange (Multiprotocol Label Switching, MPLS), label switched path (Label Switched Path, LSP), multipath passage and the link (path that existence can be returned) that some are unidirectional, when having mulitpath between two systems, in these two adjacent systems, can there be a plurality of BFD Session (BFD session).
The BFD method need be set up reciprocity BFD session at the passage two ends before detection, with based on OSPF (Open Shortest Path First, the process that OSPF) BFD session is set up is an example, as shown in Figure 1, comprises following step:
Step S101, router-A and router B set up ospf neighbor;
The OSPF of step S102, router-A and router B triggers the BFD processing module initialization BFD session of local terminal when sending the HELLO message;
Step S103, set up the BFD session by the BFD session three-way handshake between ospf neighbor.
After session is set up, send BFD control message to the opposite end separately with the speed of consulting and realize fault detect.
The BFD agreement provides two operator schemes selective, wherein a kind of pattern is an asynchronous mode, and under asynchronous mode, local terminal system cycle ground sends the BFD message to peer-to-peer system, if a series of BDF messages are not all received by peer-to-peer system, this BFD session will lose efficacy (DOWN) so.
The BFD session connection of asynchronous mode is set up in the process, the state machine state handoff procedure as shown in Figure 2, wherein:
At first, two device start BFD of A, B, the initial condition of two equipment is (DOWN) state that lost efficacy, and to the other side's transmit status is the probe messages (transmission is spaced apart a second level) of DOWN simultaneously.
After arbitrary equipment of A, B receives that state that the other side sends is the probe messages of DOWN, BFD session status with self switches to initial link setup (INIT) state immediately, stopping simultaneously to the opposite end transmit status is the probe messages of DOWN, and changing into to the opposite end transmit status is the link building messages of INIT.
Subsequently, when any equipment of A, B receives that under the INIT state state that the other side sends is the BFD link building messages of INIT, then immediately self BFD state machine is switched to (UP) state that comes into force that detects from INIT, and the notice BFD session application of being bound.
After A, the BFD session of B two ends enter the UP state; both sides send BFD keep-alive message (state is the BFD message of UP) mutually according to the time after consulting (sending at interval normally Millisecond); when link break down or the keep-alive message because certain reason is when abandoning; the testing mechanism of A, B two ends BFD will be reported fault; the BFD session status of A, B terminal device will switch to DOWN from UP, and operations such as flow switching, route re-computation are carried out in the application of the concrete binding of notice.If both sides can normally receive and dispatch message, then both sides' BFD session can enter the UP state again at once.
After the BFD session connection was set up, it all was to cause owing to defective appears in link that the state of the state machine of BFD session switches.
Can there be such problem in present asynchronous mode state machine:
The BFD session is before entering the UP state, it all is the two-way transmission message at interval of giving out a contract for a project with level second, time-out time also is a second level, when network condition is relatively poor when packet loss occurring, because the transmission message time in the time interval of session this moment is with overtime all relative longer, both sides' message still can arrive in time-out time, and the BFD session can normally enter the UP state; But the BFD session enter detect (UP) state that comes into force after, both sides' equipment can be with the time after the negotiation, normally the interval of Millisecond sends the keep-alive message mutually; If this moment, network condition was relatively poor, the situation of time-delay or packet loss appears in the transmission in the network, terminal device A, B will be because of can not in time receiving the keep-alive message that the other side sends, detect that link breaks down and the state that jumps to inefficacy (DOWN), and operations such as flow switching, route re-computation are carried out in the application of the concrete binding of notice; After entering the DOWN state, terminal device can send probe messages and initial link building messages with the long time interval and time-out time again, network condition is if can normally receive and dispatch probe messages and initial link building messages at this moment, and then both sides' BFD session can enter the state that comes into force that detects again at once; So circulation, the BFD session status at communication link two ends will enter in the process that the frequent cycle of a kind of DOWN → INIT → UP → DOWN switches, and the BFD session status enters oscillatory regime; Vibration can cause transmitting route constantly to be recomputated and switches, and can cause the lasting cutout in the network.
Summary of the invention
The embodiment of the invention provides a kind of method and device that suppresses bidirectional forwarding detection link oscillation, in order to solve under the relatively poor situation of network condition, the BFD link enters oscillatory regime and causes transmitting route and constantly recomputate and switch, and causes the problem of the lasting cutout in the network.
The method of the inhibition bidirectional forwarding detection link oscillation that the embodiment of the invention provides comprises:
Periodically the state to two-way forwarding detection BFD session monitors;
Described BFD session status switches the frequency values of getting back to this state once more by a kind of state in the statistics current period through state;
When described frequency values during, suppress described BFD session and switch to next state more than or equal to preset threshold.
Described statistics BFD session status switches the frequency values of getting back to this state once more by a kind of state through state, comprising:
Add up described BFD session status is switched to failure state once more by failure state, initial link setup state and the detection state that comes into force frequency values; Or
Add up described BFD session status by initial link setup state, detect the frequency values that the state that comes into force and failure state switch to initial link setup state once more; Or
Add up described BFD session status and switch to the frequency values that detects the state that comes into force once more by come into force state, failure state and initial link setup state of detection.
The described BFD session of described inhibition switches to next state, comprising:
In the punishment inhibition time of setting, stop to send and receiving the BFD message.
Described punishment suppresses the duration of time and determines in the following manner:
According to the described frequency values that statistics obtains, determine that described punishment suppresses the duration of time; Described duration and described frequency values positive correlation.
The duration of described setting is more than or equal to the monitoring period to described BFD session.
After the punishment inhibition time of described setting finishes, also comprise:
Continue to send corresponding BFD message;
The state of described BFD session is carried out the supervision of next cycle.
A kind of device that suppresses bidirectional forwarding detection link oscillation that the embodiment of the invention provides comprises:
Monitor module, the state that is used for periodically two-way forwarding is detected the BFD session monitors;
Statistical module is used to add up the described BFD session status of current period and switches the frequency values of getting back to this state once more through state by a kind of state;
Judge module is used to judge that whether described frequency is more than or equal to preset threshold;
Suppress module,, suppress described BFD session and switch to next state when described frequency values during more than or equal to preset threshold.
Described statistical module also is used to add up described BFD session status is switched to failure state once more by failure state, initial link setup state and the detection state that comes into force frequency; Or
Add up described BFD session status by initial link setup state, detect the frequency that the state that comes into force and failure state switch to initial link setup state once more; Or
Add up described BFD session status and switch to the frequency that detects the state that comes into force once more by come into force state, failure state and initial link setup state of detection.
Described inhibition module also was used in the punishment inhibition time of setting, and stopped to send and receiving the BFD message.
A kind of device that suppresses bidirectional forwarding detection link oscillation that the embodiment of the invention provides also comprises: the duration determination module, be used for the described frequency values that obtains according to statistics, and determine that described punishment suppresses the duration of time; Described duration and described frequency values positive correlation.
A kind of device that suppresses bidirectional forwarding detection link oscillation that the embodiment of the invention provides also comprises: BFD message sending module is used for continuing to send corresponding BFD message after the described punishment inhibition time finishes;
Described monitor module also is used for the state of described BFD session being carried out the supervision of next cycle after the described punishment inhibition time finishes.
The beneficial effect of the embodiment of the invention is as follows:
The two-way forwarding of the inhibition that the embodiment of the invention provides detects the method and the device of BFD link oscillation, under the relatively poor situation of network state, monitor by state the BFD session, the BFD session status switches the frequency values of getting back to this state once more by a kind of state in the statistics current period through state, if the frequency values that statistics obtains is more than or equal to preset threshold, suppress the BFD session and switch to next state, the further link setup flow process that has just suppressed this BFD session, avoided BFD link link re-establishment constantly under the relatively poor situation of networking situation, chain rupture causes the BFD link oscillation, causes transmitting the problem that route constantly recomputates and switches.
Further, the method and the device of the inhibition BFD link oscillation that the embodiment of the invention provides, suppress the step that the BFD session switches to next state, be by in the punishment inhibition time of setting, stop temporarily sending and receive that any BFD message realizes, and the frequency values positive correlation that the duration of punishment inhibition time and statistics obtain, in other words, the frequency values that the BFD session status of statistics switches is high more, corresponding, its punishment inhibition time is just long more, the strategy that this punishment suppresses, can adjust the duration that suppresses BFD link setup flow process according to the unsettled practical extent of network condition, more effectively guarantee to suppress the effect of BFD link oscillation.
Description of drawings
Fig. 1 sets up schematic diagram in the prior art based on the BFD session of ospf protocol;
Fig. 2 sets up state machine state handoff procedure figure in the process for the BFD session connection of existing asynchronous mode;
The hardware connection diagram of the method for the inhibition bidirectional forwarding detection link oscillation that Fig. 3 provides for the embodiment of the invention;
The flow chart of the method for the inhibition bidirectional forwarding detection link oscillation that Fig. 4 provides for the embodiment of the invention;
The structural representation of the device of the inhibition bidirectional forwarding detection link oscillation that Fig. 5 provides for the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing, a kind of method and device that suppresses bidirectional forwarding detection link oscillation provided by the invention is described in detail with specific embodiment.
With application scenarios shown in Figure 3 is example, and in the application scenarios shown in Figure 3, the hardware components of routing forwarding comprises two router (also can be switch or other forwarding units) and the other router R3 that support the BFD function.
Router R1 possesses simultaneously and supports configuring static route, function and support IP quick heavy-route (IP Fast Reroute Framework, the IP FRR) function related with BFD.Two static routing of configuration on router R1 and interface that Access Network links to each other, specify different priority, the interface IP address of next jumping sensing R2 equipment of high priority is (142.0.0.2) for example, next of inferior priority jumped and pointed to the interface IP address that router R3 links to each other with R1, form primary link by router R1 and router R2, owing to disposed the BFD session association between router R1 and the router R2, support the router R1 of BFD function and the R2 BFD neighbours that can partner, under primary link normal condition between router R1 and the router R2, when visiting the packet process router R1 of remote equipment by Access Network, transmit by router R1 and router R2, these two routers use the BFD session to guarantee the accessibility of primary link simultaneously, in case the link between router R1 and the router R2 breaks down, so, the FRR that route is finished in the application of the concrete binding of BFD session meeting notice switches, and is about to the reserve link that conversion link switches between router R1 and the router R3 and gets on.
The method of the inhibition BFD link oscillation that the embodiment of the invention provides, can be in advance carry out the relevant parameter that the BFD link oscillation suppresses, for example to supervision (can the realize) cycle of the state of BFD session, the maximum threshold of BFD session status switching frequency etc. by its state machine is monitored to equipment.
The BFD session is normally set up between router R1 and router R2, when entering the link detecting process, can use the method for the inhibition bidirectional forwarding detection link oscillation that the embodiment of the invention provides in the equipment of any end of both link ends.
For the convenience that illustrates, below be that example illustrates only with an end equipment wherein, specify the inhibition bidirectional forwarding detection link oscillation method that the embodiment of the invention provides, and address router R1 is first equipment, correspondingly, address router R2 is second equipment.
The method of the inhibition bidirectional forwarding detection link oscillation that the embodiment of the invention provides as shown in Figure 4, may further comprise the steps:
S401, according to default monitoring period, periodically the state to the BFD session of first equipment monitors;
To the supervision of the state of BFD session, can monitor realization by state machine (hereinafter to be referred as the BFD state machine, the state of record BFD session) to the BFD session.
This BFD session status switches the frequency values of getting back to this state once more by a kind of state in S402, the statistics current period through state;
If the BFD link has entered oscillatory regime between terminal device, the BFD state machine can will constantly switch between different states.
In current period, constantly the frequency that the BFD state machine of first equipment is got back to this state once more by the switching of some state process states is counted.
The once following state migration course of the every generation of BFD state machine for example: switch to initial link setup state (INIT) from failure state (DOWN), the change detection state (UP) that comes into force switches to failure state (DOWN) once more then; Perhaps switch to and detect the state (UP) that comes into force, switch to failure state (DOWN) then, switch to initial link setup state (INIT) once more from initial link setup state (INIT); Perhaps switch to failure state (DOWN) from the detection state (UP) that comes into force, switch to initial link setup state (INIT) then, switch to once more and detect the state (UP) that comes into force, all correspondingly carry out record, the number of times of above-mentioned state migration course takes place in statistics in current period.
Obtain total degree that the BFD state machine state migrates divided by cycle duration according to statistics then, obtain in the current period BFD session and switch the occurrence frequency value of getting back to this state once more through state by some states.
The BFD session that step S403, determining step S402 obtain by some states through state switch get back to this state once more frequency values whether greater than preset threshold, if, carry out following step S404, if not, carry out following step S405;
Step S404, in the punishment inhibition time of setting, the punishment of carrying out BFD session link setup suppresses, and suppresses the BFD session and switches to next state.
Concrete implementation method is as follows:
First equipment stopped to send any BFD message (comprising probe messages, link building messages and keep-alive message) to second equipment in the punishment inhibition time of setting, and for the BFD message that second equipment sends, also stopped to receive, and directly abandoned.
For instance, suppose that current BFD state machine has switched to DOWN state (statistics BFD session is from the occurrence frequency of DOWN state → INIT state → UP state → DOWN stateful switchover process) by the UP state, the punishment that need carry out BFD session link setup suppresses, so, first equipment is the probe messages of DOWN to the second equipment transmit status no longer, when second equipment is overtime do not receive the DOWN message that first equipment sends after, also correspondingly switched to the state of DOWN, even second equipment does not adopt the method for the inhibition BFD link oscillation that the embodiment of the invention provides, continuation is the probe messages of DOWN to the first equipment transmit status, because first equipment can not receive any BFD message that second equipment sends, so, in the punishment inhibition time, the next state that the BFD session of first equipment and second equipment all can't switch to DOWN is the INIT state.
The duration of punishment inhibition time can be determined according to the frequency values of adding up the BFD session status migration course that obtains among the step S402, if it is bigger that the BFD session status that obtains of statistics is migrated frequency values, punish that so the inhibition time can grow a bit, otherwise, then can lack the frequency values positive correlation that the duration of punishment inhibition time and statistics obtain relatively.
But the punishment inhibition time can not be too short, otherwise can't reach the effect that the BFD link oscillation is suppressed, and usually, the duration of punishment inhibition time is at least more than or equal to the monitoring period to the BFD session.
After the punishment inhibition time finishes, carry out following step S405.
Step S405, first equipment continue to send corresponding BFD message to second equipment, and the state of equipment B FD session is carried out the supervision of next cycle.
When supposing that Penalty time finishes, the state of BFD state machine is the DOWN state, and first equipment is initiated the link setup flow process of next round so, and continuing to the second equipment transmit status is the probe messages of DOWN.
If this moment, link circuit condition took a turn for the better, first equipment and second equipment can enter the UP state again, send the keep-alive message with the very short time interval mutually.
The two-way forwarding of the inhibition that the embodiment of the invention provides detects the method for BFD link oscillation, can be implemented between router R1 and the router R2 the relatively poor or network condition of network condition when unstable, BFD link setup process is carried out temporary transient inhibition, avoided the BFD link oscillation to cause data forwarding paths frequent problem of switching between primary link and reserve link.
The two-way forwarding of the inhibition that provides according to the embodiment of the invention detects the method for BFD link oscillation, the embodiment of the invention also provides a kind of device that two-way forwarding detects the BFD link oscillation that suppresses, as shown in Figure 5, comprise: monitor module 501, statistical module 502, judge module 503 and inhibition module 504, wherein:
Suppress module 504, the frequency values that obtains when statistics suppresses this equipment B FD session and switches to next state during more than or equal to preset threshold.
Statistics BFD session status by initial link setup state, detect the frequency that the state that comes into force and failure state switch to initial link setup state once more; Or
Add up described BFD session status and switch to the frequency that detects the state that comes into force once more by come into force state, failure state and initial link setup state of detection.
The two-way forwarding of the inhibition that the embodiment of the invention provides detects the device of BFD link oscillation, as shown in Figure 5, can also comprise duration determination module 505, is used for the frequency values that obtains according to statistics, determines the duration of punishment inhibition time; Duration and this frequency values positive correlation of punishment inhibition time.
The two-way forwarding of the inhibition that the embodiment of the invention provides detects the device of BFD link oscillation, as shown in Figure 5, can also comprise: BFD message sending module 506 is used for continuing to send corresponding BFD message after the punishment inhibition time finishes;
The two-way forwarding of the inhibition that the embodiment of the invention provides detects the method and the device of BFD link oscillation, under the relatively poor situation of network state, monitor by state the BFD session, the BFD session status switches the frequency values of getting back to this state once more by a kind of state in the statistics current period through state, if the frequency values that statistics obtains is more than or equal to preset threshold, suppress the BFD session and switch to next state, the further link setup flow process that has just suppressed this BFD session, avoided BFD link link re-establishment constantly under the relatively poor situation of networking situation, chain rupture causes the BFD link oscillation, causes transmitting the problem that route constantly recomputates and switches.
Further, the method and the device of the inhibition BFD link oscillation that the embodiment of the invention provides, suppress the step that the BFD session switches to next state, be by in the punishment inhibition time of setting, stop temporarily sending and receive that the BFD message realizes, and the frequency values positive correlation that the duration of punishment inhibition time and statistics obtain, in other words, the frequency values that the BFD session status of statistics switches is high more, corresponding, its punishment inhibition time is just long more, the strategy that this punishment suppresses, can adjust the duration that suppresses BFD link setup flow process according to the unsettled practical extent of network condition, more effectively guarantee to suppress the effect of BFD link oscillation.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (11)
1, a kind of method that suppresses bidirectional forwarding detection link oscillation is characterized in that, comprising:
Periodically the state to two-way forwarding detection BFD session monitors;
Described BFD session status switches the frequency values of getting back to this state once more by a kind of state in the statistics current period through state;
When described frequency values during, suppress described BFD session and switch to next state more than or equal to preset threshold.
2, the method for claim 1 is characterized in that, described statistics BFD session status switches the frequency values of getting back to this state once more by a kind of state through state, comprising:
Add up described BFD session status is switched to failure state once more by failure state, initial link setup state and the detection state that comes into force frequency values; Or
Add up described BFD session status by initial link setup state, detect the frequency values that the state that comes into force and failure state switch to initial link setup state once more; Or
Add up described BFD session status and switch to the frequency values that detects the state that comes into force once more by come into force state, failure state and initial link setup state of detection.
3, method as claimed in claim 2 is characterized in that, the described BFD session of described inhibition switches to next state, comprising:
In the punishment inhibition time of setting, stop to send and receiving the BFD message.
4, method as claimed in claim 3 is characterized in that, described punishment suppresses the duration of time and determines in the following manner:
According to the described frequency values that statistics obtains, determine that described punishment suppresses the duration of time; Described duration and described frequency values positive correlation.
5, method as claimed in claim 3 is characterized in that, the duration of described setting is more than or equal to the monitoring period to described BFD session.
6, as claim 4 or 5 described methods, it is characterized in that, after the punishment inhibition time of described setting finishes, also comprise:
Continue to send corresponding BFD message;
The state of described BFD session is carried out the supervision of next cycle.
7, a kind of device that suppresses bidirectional forwarding detection link oscillation is characterized in that, comprising:
Monitor module, the state that is used for periodically two-way forwarding is detected the BFD session monitors;
Statistical module is used to add up the described BFD session status of current period and switches the frequency values of getting back to this state once more through state by a kind of state;
Judge module is used to judge that whether described frequency is more than or equal to preset threshold;
Suppress module,, suppress described BFD session and switch to next state when described frequency values during more than or equal to preset threshold.
8, device as claimed in claim 7 is characterized in that, described statistical module also is used to add up described BFD session status is switched to failure state once more by failure state, initial link setup state and the detection state that comes into force frequency values; Or
Add up described BFD session status by initial link setup state, detect the frequency values that the state that comes into force and failure state switch to initial link setup state once more; Or
Add up described BFD session status and switch to the frequency values that detects the state that comes into force once more by come into force state, failure state and initial link setup state of detection.
9, device as claimed in claim 7 is characterized in that, described inhibition module also was used in the punishment inhibition time of setting, and stopped to send and receiving the BFD message.
10, device as claimed in claim 9 is characterized in that, also comprises: the duration determination module, be used for the described frequency values that obtains according to statistics, and determine that described punishment suppresses the duration of time; Described duration and described frequency values positive correlation.
11, device as claimed in claim 9 is characterized in that, also comprises: BFD message sending module is used for continuing to send corresponding BFD message after the described punishment inhibition time finishes;
Described monitor module also is used for the state of described BFD session being carried out the supervision of next cycle after the described punishment inhibition time finishes.
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