CN101160855A - Method of implementing IP forwarding plane fault detection - Google Patents
Method of implementing IP forwarding plane fault detection Download PDFInfo
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- CN101160855A CN101160855A CNA2006800121781A CN200680012178A CN101160855A CN 101160855 A CN101160855 A CN 101160855A CN A2006800121781 A CNA2006800121781 A CN A2006800121781A CN 200680012178 A CN200680012178 A CN 200680012178A CN 101160855 A CN101160855 A CN 101160855A
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Abstract
A method which realizes the fault detection of the IP forwarding plane includes the following procedures: obtaining BFD identifier information used for bidirectional forward detecting (BFD) by the IP node at the two sides and actuating the BFD conversation (500), packing the BFD message by the IP node and transferring among the IP codes of the BFD conversation (501), and executing fault detection according to the BFD message transmitted among the IP nodes. The method of the invention actuates BFD conversation and realizes the fault detection with the transmitting of the BFD message between areas/in areas.
Description
The method for realizing the detection of IP fault of forwarding plane
Technical field
The present invention relates to two-way converting detection（BFD) technology, the method that the detection of IP fault of forwarding plane is realized in espespecially a kind of utilization two-way converting detection.Background of invention
With the development of the communication technology, how data delivery quality is ensured, when data transmission goes wrong, quickly failure is positioned, a major issue urgently to be resolved hurrily is had become, therefore, BFD is used as a kind of fast detection mechanism, arise at the historic moment, BFD is that link is detected by a kind of Hello mechanism of quickly negotiable speed.
BFD can be used for detection Ethernet, multi protocol label and exchange（MPLS) path, Generic Routing Encapsulation and IP Security Protocol（IPSec) polytype transmission correctness including tunnel.
BFD passes through from underlying transport technology progressively to be developed, therefore BFD can detect the failure of each layer in network.BFD target is that, there is provided a kind of low overhead, the failure detection mechanism of short detection cycle, the neighboring router refers to be not limited to a jump between the router for having any one or more logical links connected, router on path between neighboring router.BFD can be carried out including interface, data link and be expanded to the detection of forwarding engine itself.
BFD has very big advantage as the link or node or the detection method of interface fault of a kind of underloading for the failure of detection data plane.Defining BFD at present is used to detect the state machine of failure and for setting up BFD sessions and safeguarding some necessary parameters of BFD sessions, and expressed in the form of data load, for various agreements, various media are used when using BFD as data plane failure testing mechanism as data load.But, BFD is not defined on the method for how starting BFD sessions in the case of various media, various agreements in itself, therefore, for specific application
Scene, if the fault detect of data forwarding plane is realized using BFD, currently without specific implementation.
At present, define how in multiprotocol label switching（MPLS label switched path) is used as using BFD in network（LSP) the method for fault detect, also specify method for packing of the BFD loads in MPLS, simultaneously for BFD session initiations, use a kind of method of detection MPLS LSP data plane failures.LSP is as shown in Figure 1 in detected domain accordingly, it is specifically as follows the path between LSR A and the LSR B in domain A (Domain A), LSP between domain detected accordingly is as shown in Fig. 2 path between LSR A and the LSR B being specifically as follows between Domain A and Domain B.In addition, defining BFD loads as UDP（UDP) load is encapsulated etc. in IP messages.
Above-mentioned technical proposal is to use BFD as a kind of method of fault detect for MPLS LSP, does not account for the detection method for using BFD as IP fault of forwarding plane.The content of the invention
In view of this, it is a primary object of the present invention to provide a kind of method for realizing the detection of IP fault of forwarding plane, the detection of IP fault of forwarding plane can be realized using BFD.
To reach above-mentioned purpose, what technical scheme was specifically realized in：
A kind of method for realizing the detection of IP fault of forwarding plane, this method comprises the following steps：
A. IP nodes, which are obtained, detects BFD BFD identifier informations for two-way converting and starts BFD sessions；
B. the blunt texts of IP nodes encapsulation BFD 4 and the transmission between the IP nodes of BFD sessions；
C. fault detect is carried out according to the BFD messages transmitted between IP nodes.
The IP nodes are IP nodes between two domains, and route dynamic configuration , Bu Sudden A are specifically included：
Pass through interactive Border Gateway Protocol (BGP) Receive message BFD identifiers between the IP nodes
Information simultaneously starts the BFD sessions between the IP nodes.
The BFD identifier informations are carried in the new capacity coding of the opening OPEN messages of the BGP messages；
The new capacity encoding setting is in the capability option of OPEN messages.
The IP nodes are IP nodes between two domains, and route dynamic configuration, and step A is specifically included：
Corresponding BFD identifier informations are configured on the IP nodes respectively, and utilize configured BFD identifier informations to start the BFD sessions between the IP nodes.
The IP nodes are IP nodes in IP nodes between two domains or two domains, and route static configuration, and step A is specifically included：
Corresponding BFD identifier informations are configured on the IP nodes respectively, and utilize configured BFD identifier informations to start the BFD sessions between the IP nodes.
The IP nodes specifically include for IP nodes in IP nodes between two domains or two domains, and route static configuration , Bu Sudden A：
BFD identifier informations are obtained by the interactive blunt texts of ICMPv44 between the IP nodes and start the BFD sessions between the IP nodes.
The BFD identifier informations carrying is in the newly-increased local terminal identifier domain that the ICMPv4 information requests or ICMPv4 information of the ICMPv4 messages are receiveed the response.
The step A further comprises：Restart bgp session after the startup BFD sessions.C bits in the BFD messages are used to state whether BFD sessions are associated with control plane；The step A further comprises：
BFD sessions opposite end IP nodes determine whether stopping control plane BGP Graceful Restart processes according to the C bit informations, if C bit informations are shown as unconnected, and BFD sessions detect failure, then stop BGP Graceful Restart processes；If C bit informations are shown as associated, and BFD sessions detect failure, then continue executing with BGP Graceful Restart processes.
Start described in step A before BFD sessions, this method also includes：
The IP nodes are obtained after BFD identifier informations, determine whether to start the detection that BFD carries out static route transfer plane failure as needed.
It is to the method that BFD messages are packaged described in Bu Sudden B：It is packaged using User Data Protocol UDP messages.
As seen from the above technical solution, by the present invention in that IP nodes obtain the BFD identifier informations detected for BFD, and BFD sessions are started using the BFD identifiers obtained, to realize BFD fault detects.The IP nodes between as the IP nodes both sides of BFD session endpoints for domain, and during route dynamic configuration, the method for above-mentioned acquisition BFD identifiers can be by Border Gateway Protocol（BGP opening)（OPEN) message transmits BFD identifier informations between the domain between IP nodes, or is pre-configured with corresponding BFD identifier informations on IP nodes between each domain respectively.As the IP nodes both sides of BFD session endpoints be domain between/domain in IP nodes, and during route static configuration, the method of above-mentioned acquisition BFD identifiers can configure corresponding BFD identifier informations on each IP nodes respectively, or BFD identifier informations are transmitted between the IP nodes by extending Internet control information agreement (ICMPv4) message.
The inventive method starts BFD sessions, and using BFD messages between domain/domain in transmission between IP nodes realize fault detect.Brief Description Of Drawings
Fig. 1 is LSP schematic diagrames in detected domain；
Fig. 2 is LSP schematic diagrames between detected domain；
Fig. 3 is the structural representation that IP nodes realize BFD sessions in domain；
Fig. 4 is the structural representation that IP nodes realize BFD sessions between domain；
Fig. 5 is the flow chart of the inventive method.
Implement the mode of the present invention
The present invention core concept be：IP nodes are obtained for the BFD BFD identifier informations detected and start BFD sessions, and the encapsulation and transmission of BFD messages are carried out between the IP nodes of BFD sessions；Fault detect is carried out according to the BFD messages transmitted between IP nodes.
For the objects, technical solutions and advantages of the present invention are more clearly understood, develop simultaneously preferred embodiment referring to the drawings, and the present invention is described in more detail.
IP Forwarding plane includes two kinds of situations between the Nei HeIP domains of IP domains, respectively as shown in Figure 3 and Figure 4, wherein, Fig. 3 is the structural representation that IP nodes realize BFD sessions in domain, Fig. 4 is the structural representation that IP nodes realize BFD sessions between domain, and the configuration wherein being route between IP nodes can have two kinds of situations of dynamic configuration and static configuration.The concept of IP Forwarding plane belongs to ability preforming technique personnel's common knowledge, and no longer Fig. 3 and Fig. 4 are described in detail here.
The inventive method respectively for BFD sessions both sides be domain between IP nodes and route dynamic configuration, and BFD sessions both sides be domain between/domain in IP nodes and route two kinds of situations of static configuration, specifically describe realize fault detect method.
Fig. 5 is the flow chart of the inventive method, is comprised the following steps：
Step 500:IP nodes obtain for the BFD BFD identifier informations detected and start BFD sessions.
(one）IP nodes between IP nodes are two domains, and during route dynamic configuration, obtain for the BFD BFD identifier informations detected and start the methods of BFD sessions and have following two.
(1) ability (capabilities) option in the option parameter (option parameters) in BGP OPEN messages is extended, increases new capability code（Capability Code), for carrying BFD sessions (session) identifier, indicate whether as BFD capability indication informations with BFD disposal abilities.The form of specific OPEN messages is as described below：
Capability Code (1 octet):Specific encoded radio；
Capability Length (1 octet):Capable field length is 4;
Capability Value (variable):For carrying capacity value, the ability value is a variable, is specially that actual BFD session identifier informations are BFD identifier informations, the Capability Value fields are referred to as local terminal identifier（My discriminator) field；
When starting BFD session, the BFD identifiers of the opposite end of session can be obtained on IP nodes according to described BFD capability indication informations between the domain of opposite end, correctly detected, it is to avoid error detection.For example, when Router A and Router B are bgp neighbors, if forward-path is faulty for the forwarding of UDP messages between Router A and Router B, for transmission control protocol（TCP) message forwards no failure, then, it is faulty for BFD message forwarding paths, it is normal for BGP message forwarding paths.If BFD does not use BGP OPEN messages, whether declaration possesses BFD disposal abilities, and otherwise start such as static configuration, the BFD session between Router A and Router B can be so caused to fail, because now, bgp information forwarding is normal, for bgp protocol, it cannot be distinguished by the situation that opposite end in BFD session failure scenarios and BGP adjoinings does not support BFD disposal abilities, it is likely to result in BGP and thinks that forward-path is normal, normal operation is also continued to when datum plane is faulty.
In this step, whether possess BFD disposal abilities information to start BFD session if carried using BGP OPEN messages, on two IP end points of BGP, in addition to it there is the startup to BFD session, also need to start existing BGP session, in order to prevent repeated priming, the inventive method is further handled as follows to starting BFD session and starting BGP session order：During BGP session are started, when starting BFD session by BGP OPEN messages, if BGP session startup does not consider whether BFD session start, BFD session can start after BGP session.But, if BFD is in activation（UP) state, may cause BGP session just to set up in some cases, it is necessary to the situation of restarting.For example, when Router A and Router B are bgp neighbors, if forward-path forwards no failure to be normal to BGP message forwarding paths for TCP message between Router A and Router A, and the message such as UDP messages of other protocol types are broken down, it can now lead in datum plane
The malfunction that certain methods detect forward-path is crossed, system reboot is so likely to result in, is not in repeated priming if bgp session waits BFD session to start before being initiated now.Because when BFD session can not be activated in these cases, BGP session can also be constantly in non-foundation（Establish) state is OPEN states.
For this, if when BGP session start, BFD session are started by BGP OPEN messages, after BFD session are in UP states, restart BGP session and make it into foundation (established) state, the problem of can so avoiding above-mentioned occurs., it is necessary to BGP session retention time during BGP session wait BFD session to start（Hold time) handle accordingly, it can not such as refresh, such BGP session are not time out, it is to avoid cause BGP session to fail because of time-out.Provided according to agreement, the retention time refers to BGP session in the time needed to wait for from OPEN state transitions to established states.
In actual application, the ordinal relation for considering to start B GP session and BFD session can be decided whether according to actual conditions, it can also be independent carry out to start BGP session and BFD session.
Further, on two IP end points of BGP, the inventive method is to BFD session and existing BGP smooth startings（BGP graceful restart) between relation can use following processing method：If the C bit positions in BFD session BFD messages are independent control plane（Control Plane Independent) position statement not because control plane fail（Down) influence BFD session are that BFD session and control plane are unconnected, then when BFD session just detect failure and BGP graceful restart are carried out, BGP graceful restart processes should be stopped, because now data plane also there occurs failure, it should carry out system reboot；
If associated in bit statement BFD session of C and control plane of BFD messages, will not then have an impact to BGP graceful restart processes, because now BFD session and control plane are associated, no matter Forwarding plane whether failure, BFD session are now failures.
Assuming that Cbit are that 0 expression is unconnected, Cbit are that 1 expression is associated, then, BFD
Session opposite end IP nodes are received after BFD messages, if C bits are 0, and BFD sessions detect failure, then stop BGP Graceful Restart processes；If C bits are 1, and BFD sessions detect failure, then continue executing with BGP Graceful Restart processes.
(2) BFD identifiers can also be obtained by the way of static configuration in the present invention, corresponding BFD identifier informations are configured on IP nodes specially between domain, and the mode of the active/passive transmission BFD messages of configuration local terminal is whether actively to send BFD messages, the specific two ends that are configurable to are actively, or one end is actively, the other end is passive mode；And configure BFD functions and enable information, IP nodes lead execution BFD functions using described BFD identifiers bow I and start BFD detection process between domain.
^ 1, which leads to perform BFD functions and starts implementing for BFD detection process, can be found in related draft regulation, repeat no more here, this step is it is emphasised that the method for acquisition BFD identifier informations.
(two）IP nodes in IP nodes or two domains between IP nodes are two domains, and during route static configuration, obtain for the BFD BFD identifier informations detected and start the methods of BFD sessions and have following two.
(1) static configuration BFD identifiers.
On operation BFD both link ends IP nodes, static configuration BFD identifier informations, and be active with two ends are configurable to, or one end is actively, the other end is passive mode；And configure BFD functions and enable information, between domain/domain in IP nodes start BFD detection process using described BFD identifiers.
(2) ICMPv4 information requests are extended（ICMPv4 Information Request) I ICMPv4 information receives the response（ICMPv4 Information Reply Message) message transmits BFD identifiers between IP nodes, so that opposite end obtains BFD identifiers and starts BFD sessions.
Increase my discriminator domains in ICMPv4 Information Request/ ICMPv4 Information Reply Message messages, for 7The BFD identifier informations of local terminal are carried, and are led to
Cross the forward-path source between IP nodes（Or terminal）ICMPv4 Information Request messages are sent, by source（Or terminal）BFD identifiers are sent to terminal（Or source）；Meanwhile, in terminal（Or source）Carried terminal in the ICMPv4 Information Reply Message messages of return（Or source）BFD identifiers, and be sent to source（Or terminal）.Pass through transmission of the ICMPv4 messages between IP nodes so that the two ends IP nodes of static routing link obtain the BFD identifier informations of peer node.
Step 501:IP nodes are packaged BFD messages and transmitted the IP nodes of BFD sessions.
BFD messages can be packaged using UDP messages, i.e. by BFD messages and BFD loads with UDP messages be carried on both link ends IP nodes between be transmitted, corresponding UDP source port numbers and destination slogan can assign mechanism by internet address（IANA) tissue is distributed unitedly.Specific method for packing can be found in related draft regulation, repeat no more here.
In actual application, application program can decide whether startup optimization BFD functions as needed, be detected with the failure to static route transfer plane.
Step 502:Fault detect is carried out according to the BFD messages transmitted between IP nodes.
Specific BFD detection process has been clearly stated in BFD agreements, and I will not elaborate.In summary, the present invention can use BFD detection fault of forwarding plane between the forward-path of bgp neighbor, it is possible to the error detection situation being likely to occur when being used as detection forward-path failure using BFD in some cases is avoided between IP domains.Meanwhile, the present invention detects IP fault of forwarding plane for static routing using BFD, so as to improve the reliability of the fault detect of static route transfer plane.
It is described above; only presently preferred embodiments of the present invention; it is not intended to limit the scope of the present invention, any modification, equivalent substitution and improvements done within the spirit and principles of the invention etc. should be included in the scope of the protection.
Claims (1)
- Claims1st, a kind of method for realizing the detection of IP fault of forwarding plane, it is characterised in that this method comprises the following steps：A. IP nodes, which are obtained, detects BFD BFD identifier informations for two-way converting and starts BFD sessions；B. IP nodes encapsulation BFD messages and the transmission between the IP nodes of BFD sessions；C. fault detect is carried out according to the BFD messages transmitted between IP nodes.2nd, according to the method described in claim 1, it is characterised in that the IP nodes are IP nodes between two domains, and route dynamic configuration, and step A is specifically included：BFD identifier informations are obtained by the interactive blunt text of Border Gateway Protocol (BGP) 4 between the IP nodes and start the BFD sessions between the IP nodes.3rd, method according to claim 2, it is characterised in that the BFD identifier informations are carried in the new capacity coding of the opening OPEN messages of the BGP messages；The new capacity encoding setting is in the capability option of OPEN messages.4th, according to the method described in claim 1, it is characterised in that the IP nodes are IP nodes between two domains, and route dynamic configuration, and step A is specifically included：Corresponding BFD identifier informations are configured on the IP nodes respectively, and utilize configured BFD identifier informations to start the BFD sessions between the IP nodes.5th, according to the method described in claim 1, it is characterised in that the IP nodes are IP nodes in IP nodes between two domains or two domains, and route static configuration, and step A is specifically included：Corresponding BFD identifier informations are configured on the IP nodes respectively, and utilize configured BFD identifier informations to start the BFD sessions between the IP nodes.6th, the method described in claim 1 is occupied, it is characterised in that the IP nodes are IP nodes in IP nodes between two domains or two domains, and route static configuration, and step A is specifically included： By interactive ICMPv4 Receive message BFD identifier informations and start the BFD sessions between the IP nodes between the IP nodes.7th, method according to claim 6, it is characterised in that the BFD identifier informations carrying is in the newly-increased local terminal identifier domain that the ICMPv4 information requests or ICMPv4 information of the ICMPv4 messages are receiveed the response.8th, method according to claim 2, it is characterised in that the step A further comprises：Restart bgp session after the startup BFD sessions.9th, method according to claim 2, it is characterised in that the C bits in the BFD messages are used to state whether BFD sessions are associated with control plane；The step A further comprises：BFD sessions opposite end IP nodes determine whether stopping control plane BGP Graceful Restart processes according to the C bit informations, if C bit informations are shown as unconnected, and BFD sessions detect failure, then stop BGP Graceful Restart processes；If C bit informations are shown as associated, and BFD sessions detect failure, then continue executing with BGP Graceful Restart processes.10th, the method according to claim 5 or 6, it is characterised in that start described in step A before BFD sessions, this method also includes：The IP nodes are obtained after BFD identifier informations, determine whether to start the detection that BFD carries out static route transfer plane failure as needed.11st, the method according to claim 1, it is characterised in that be to the method that the blunt texts of BFD 4 are packaged described in step B：It is packaged using User Data Protocol UDP messages.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200510087705.2 | 2005-08-05 | ||
| CN200510087706.7 | 2005-08-05 | ||
| CNA2005100877052A CN1909470A (en) | 2005-08-05 | 2005-08-05 | Method for realizing failure detection of static route transfer plane |
| PCT/CN2006/001563 WO2007016841A1 (en) | 2005-08-05 | 2006-07-04 | A method for achieving fault detection of ip forwarding plane |
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| CNA2006800121781A Pending CN101160855A (en) | 2005-08-05 | 2006-07-04 | Method of implementing IP forwarding plane fault detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614556A (en) * | 2019-02-26 | 2020-09-01 | 中兴通讯股份有限公司 | BIER-based bidirectional forwarding detection session creation method and related equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101459547B (en) * | 2007-12-13 | 2012-09-05 | 华为技术有限公司 | Label forwarding path failure detection method and system |
| CN101989935A (en) | 2009-08-07 | 2011-03-23 | 华为技术有限公司 | Phonetic loopback method in voice over internet protocol (VoIP) internet, gateway, loopback node and internet |
| 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 |
| US10771312B2 (en) * | 2018-02-28 | 2020-09-08 | Zte Corporation | Failure detection in a data network |
| CN112291148B (en) * | 2020-10-23 | 2022-03-29 | 新华三信息安全技术有限公司 | Method for detecting BFD forwarding path quality through BFD ping |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614556A (en) * | 2019-02-26 | 2020-09-01 | 中兴通讯股份有限公司 | BIER-based bidirectional forwarding detection session creation method and related equipment |
| US11991066B2 (en) | 2019-02-26 | 2024-05-21 | Zte Corporation | Method of establishing bidirectional forwarding detection session based on BIER, and BFIR, BFER, system and storage medium |
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