CN102571601B - A kind of method and label switched path equipment for ensureing two-way converting detection reliability - Google Patents
A kind of method and label switched path equipment for ensureing two-way converting detection reliability Download PDFInfo
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Abstract
The invention discloses a kind of method and label switched path equipment for ensureing two-way converting detection reliability, source equipment carries multiprotocol label switching (MPLS) label switched path (LSP) PING request messages of Route Distinguisher information being sent to egress equipment, and Route Distinguisher information and forwarding equivalence class (FEC) of the egress equipment in the MPLS LSP PING request messages uniquely determine two-way converting detection (BFD) session.The present invention extends existing MPLS LSP Ping standards RFC4379, newly-increased MPLS Router ID TLV, which are used to carry, to be helped to uniquely determine the parameter i.e. Route Distinguisher (Router ID) of BFD sessions, on the basis of compatible existing standard, propose the complete solution of LSP BFD, avoid in existing solution for the problem of under forward-path situation of change, BFD sessions detection is abnormal.
Description
Technical field
The present invention relates to IP network field of communication technology, more particularly to it is a kind of ensure two-way converting detect reliable method and
Label switched path equipment.
Background technology
More and more important demand is in terms of network equipment reliability：It is required that the communication failure between adjacent system can obtain
Quick detection.In this way, alternate channel can be quickly established when a fault has occurred or is switched to other links.
Two-way converting detects (Bidirectional Forwarding Detection, abbreviation BFD) agreement
The demand proposes a solution.BFD technologies provide general, unrelated with a medium quick fault testing machine
System, can be each layer can be between the systems any types passage on be detected.These passages include direct link, more
Jump path, multiprotocol label switching (Multiprotocol Label Switch, abbreviation MPLS) label switched road (Label
Switch Path, abbreviation LSP), tunnel, pseudo-wire etc..The basic functional principle of BFD is to establish session between a pair of of equipment, then
BFD detection messages are periodically sent on the passage for establish session, once an end equipment can not receive within the sufficiently long time
Detection messages, it is possible to determine that there occurs problem for the path of the sense channel of opposite equip..
The BFD detection methods of MPLS LSP defined in RFC5884.The BFD detections of MPLS LSP have masters with it is passive
Side's difference, the masters for initiating BFD detections send MPLS LSP PING request (Request) messages in the head node of LSP,
MPLS request protocols extend RFC4379 (Detecting Multi-Protocol Label Switched (MPLS) Data
Plane Failures) in BFD descriptors (Discriminator) type lengths values (Type Length Value, referred to as
TLV), the BFD session descriptors of local terminal are carried in MPLS request messages, the caudal knot point of LSP receives MPLS LSP PING
After Request messages, the verification of equivalence class (Forwarding Equivalence Class, abbreviation FEC) is forwarded to, in school
Test it is legal after, the BFD session descriptors of masters are got from BFD Discriminator TLV, so as to trigger BFD sessions
Foundation, start both sides' BFD sessions interaction.Meanwhile RFC5884 standards require masters to also need to continue to send MPLS LSP
Ping request messages, are so convenient for the FEC verifications of the LSP of chain of command, and making up forwarding surface BFD detections can not carry out
The problem of FEC is verified.
Attached drawing 1 describes the connection diagram of MPLS LDP LSP, and in router 1, router 2, is established between router 3
LDP LSP, dispose LSP BFD detections on the head node router 1 of LSR.The process of establishing of BFD sessions includes：
Step 1, router 1 sends MPLS LSP Ping Request messages, and FEC 3.3.3.3/32, carry BFD
The session descriptor of local terminal BFD sessions distribution is filled in Discriminator TLV；
Step 2, after router 3 receives MPLS LSP Ping Request messages, the FEC in message
3.3.3.3/32 local terminal FEC verifications are carried out, are the discovery that the terminal of LSP, the FEC information in request messages carries out local
The matching of BFD sessions, finds the local BFD sessions not matched, and at this moment creates BFD sessions as passive, distributes passive side
BFD session descriptors, to masters start initiate BFD sessions detection；
Step 3, router 1 receives the BFD sessions of the transmission of router 3, and the BFD sessions of passive side are got from session
Descriptor, the BFD sessions of this LSP normally create；
Step 4, router 1 periodically initiates the MPLS LSP Ping request messages of chain of command, is visited by LSP Ping
Survey the legitimacy of the FEC of chain of command.After BFD sessions UP, periodic MPLS LSP Ping request messages carry out FEC
During detection, it can continue to carry BFD Discriminator TLV, so at the same time can also be by LSP in progress FEC verifications
Ping and BFD session associations.
MPLS LSP BFD's when it is implemented, occur complexity LSP network environments under, it then follows the reality of existing standard
The exception that may now cause BFD sessions to detect, as shown in Figure 2：In the case where there is multipath in LSP sources, it is possible to main
Information in the MPLS LSP Ping messages of dynamic side's periodicity sending can change with the change of forward-path, including MPLS
The source IP address of IP stems, purpose IP address etc., are possible to the change with forward-path in LSP Ping request messages
Change and change, so after egress receives MPLS LSP Ping request messages, if carried in message
BFDDiscriminator TLV are, it is necessary to request message be matched with BFD sessions, at this moment if continued according in message
FEC carries out the matching of BFD sessions with source IP address, then can matching error.
Existing standard description triggers the foundation of BFD sessions, it is necessary to pass through MPLS LSP by MPLS LSP Ping messages
The information carried in Ping messages is effectively matched the BFD sessions of some LSP, but the FEC information in LSP Ping messages with
And BFD Discriminator TLV can not one local terminal of unique match BFD sessions.To standard when it is implemented,
Passive side can generally consider the other information in MPLS LSP Ping messages, such as the source address of IP stems and FEC letters
The BFD detections for ceasing to match some LSP, but in this way, once the source IP address hair of MPLS LSP Ping messages
Changing, then can cause passive side BFD to match session, exception occur, so as to cause the BFD error detections Down when link is normal
Serious consequence.
The content of the invention
The present invention provides a kind of method and label switched path equipment for ensureing two-way converting detection reliability, solve
Define incomplete for MPLS LSP BFD detections in Current standards and cause the problem of BFD detections are abnormal under some scenes.
In order to solve the above technical problem, the present invention provides it is a kind of ensure two-way converting detection reliability method, its
In, source equipment carries multiprotocol label switching (MPLS) label switched path of Route Distinguisher information being sent to egress equipment
(LSP) PING request messages, Route Distinguisher information of the egress equipment in the MPLS LSP PING request messages with
And forwarding equivalence class (FEC) uniquely determines two-way converting detection (BFD) session.
Further, the above method can also have following characteristics：
After the egress equipment receives the MPLS LSP PING request messages, asked according to the MPLSLSP PING
When Route Distinguisher information and the FEC in message do not match BFD sessions, new BFD sessions are created.
Further, the above method can also have following characteristics：
For the source equipment after BFD conversation establishings success, periodicity sending carries BFD descriptors and described at the same time
The MPLS LSP PING request messages of Route Distinguisher information, the egress equipment receive the MPLS LSP PING request messages
Afterwards, the matching and verification of the BFD sessions are carried out according to the descriptor and the Route Distinguisher information.
Further, the above method can also have following characteristics：
For the source equipment after BFD conversation establishings success, periodicity sending does not carry Route Distinguisher information
MPLS LSP PING request messages, after the egress equipment receives the MPLS LSP PING request messages, according to described
FEC in MPLS LSP PING request messages and the Route Distinguisher information known in the BFD conversation procedures are created into
The matching and verification of the row BFD sessions.
Further, the above method can also have following characteristics：
The mode that the Route Distinguisher information is carried in MPLS LSP PING request messages is in the MPLS LSP
Increase indicates the type lengths values of the Route Distinguisher information in PING request messages.
In order to solve the above technical problem, the present invention provides a kind of label switched for ensureing two-way converting detection reliability
Junction device, wherein, the label switched path equipment, during for as source equipment, sends to egress equipment and carries route
Multiprotocol label switching (MPLS) label switched path (LSP) PING request messages of identification information；It is additionally operable to set as egress
When standby, according to from the Route Distinguisher information and forwarding equivalence class in the received MPLS LSP PING request messages of source equipment
(FEC) two-way converting detection (BFD) session is uniquely determined.
Further, above-mentioned label switched path equipment can also have following characteristics：
The label switched path equipment, when being additionally operable to as egress equipment, receives the MPLS LSPPING requests report
Wen Hou, Route Distinguisher information and the FEC in the MPLS LSP PING request messages do not match BFD sessions
When, create new BFD sessions.
Further, above-mentioned label switched path equipment can also have following characteristics：
The label switched path equipment, when being additionally operable to as source equipment, after BFD conversation establishings success, week
Phase property is sent carries BFD descriptors and the MPLS LSPPING request messages of the Route Distinguisher information at the same time；It is additionally operable to conduct
During egress equipment, after receiving the MPLS LSP PING request messages, according to the descriptor and the Route Distinguisher information into
The matching and verification of the row BFD sessions.
Further, above-mentioned label switched path equipment can also have following characteristics：
The label switched path equipment, when being additionally operable to as source equipment, after BFD conversation establishings success, week
Phase property sends the MPLS LSP PING request messages for not carrying Route Distinguisher information, when being additionally operable to as egress equipment, receives institute
After stating MPLS LSP PING request messages, FEC in the MPLS LSP PING request messages and described in establishment
The Route Distinguisher information known in BFD conversation procedures carries out the matching and verification of the BFD sessions.
Further, above-mentioned label switched path equipment can also have following characteristics：
The label switched path equipment carries the side of the Route Distinguisher information in MPLS LSP PING request messages
Formula is the type lengths values that increase indicates the Route Distinguisher information in the MPLS LSP PING request messages.
The present invention extends existing MPLS LSP Ping standard RFC4379, and newly-increased MPLS Router IDTLV are used to take
Band helps to uniquely determine the parameter i.e. Route Distinguisher (Router ID) of BFD sessions, on the basis of compatible existing standard, proposes
The complete solution of LSP BFD, avoids in existing solution under forward-path situation of change, BFD sessions detection
The problem of abnormal.Invention enhances the BFD testing mechanisms based on MPLS LSP in existing standard, effectively solve in complexity
The defects of causing BFD session abnormality detections under MPLS LSP network environments.
Brief description of the drawings
Fig. 1 is the connection diagram of MPLS LDP LSP；
Fig. 2 is source multipath MPLS LSP BFD detection schematic diagram of a scenario；
MPLS Router ID TLV definition structure schematic diagrames in Fig. 3 embodiments；
Fig. 4 implements the flow chart of MPLS LSP BFD detection methods.
Embodiment
This programme extends MPLS LSP Ping messages, and increase MPLS Router ID TLV are used to carry master
Route Distinguisher (Router ID) information of dynamic side LSP configurations.Fig. 3 shows the structure of MPLSRouter ID TLV.
As shown in figure 4, ensureing the method for two-way converting detection reliability includes：Source equipment is taken to the transmission of egress equipment
Multiprotocol label switching (MPLS) label switched path (LSP) PING request messages with route identification information, the egress are set
Standby Route Distinguisher information and forwarding equivalence class (FEC) in the MPLS LSP PING request messages uniquely determines double
(BFD) session is detected to forwarding.
In the present solution, in the forward-path change of LSP, it is only necessary to which Router id informations do not change, BFD meetings
Words are unaffected, without change.
In this method, after egress equipment receives the MPLS LSP PING request messages, according to the MPLS LSP
When Route Distinguisher information and the FEC in PING request messages do not match BFD sessions, new BFD sessions are created.
For source equipment after BFD conversation establishings success, periodicity sending carries BFD descriptors and the route at the same time
During the MPLS LSP PING request messages of identification information, the egress equipment receives the MPLS LSP PING request messages
Afterwards, the matching and verification of the BFD sessions are carried out according to the descriptor and the Route Distinguisher information.
For source equipment after BFD conversation establishings success, periodicity sending does not carry the MPLS of Route Distinguisher information
During LSP PING request messages, after the egress equipment receives the MPLS LSP PING request messages, according to the MPLS
FEC in LSP PING request messages and the Route Distinguisher information known in the BFD conversation procedures are created carry out institute
State the matching and verification of BFD sessions.
Corresponding to the above method, ensure that the label switched path equipment of two-way converting detection reliability can be with for BFD meetings
Source equipment in words can also be sent as the egress equipment in BFD sessions, during for as source equipment to egress equipment
Carry multiprotocol label switching (MPLS) label switched path (LSP) PING request messages of Route Distinguisher information；For conduct
During egress equipment, according to from the Route Distinguisher information in the received MPLS LSP PING request messages of source equipment and forwarding
Equivalence class (FEC) uniquely determines two-way converting detection (BFD) session.
The label switched path equipment, when being additionally operable to as egress equipment, receives the MPLS LSPPING requests report
Wen Hou, Route Distinguisher information and the FEC in the MPLS LSP PING request messages do not match BFD sessions
When, create new BFD sessions.
The label switched path equipment, when being additionally operable to as source equipment, after BFD conversation establishings success, week
Phase property is sent carries BFD descriptors and the MPLS LSPPING request messages of the Route Distinguisher information at the same time；It is additionally operable to conduct
During egress equipment, after receiving the MPLS LSP PING request messages, according to the descriptor and the Route Distinguisher information into
The matching and verification of the row BFD sessions.
The label switched path equipment, when being additionally operable to as source equipment, after BFD conversation establishings success, week
Phase property sends the MPLS LSP PING request messages for not carrying Route Distinguisher information, when being additionally operable to as egress equipment, receives institute
After stating MPLS LSP PING request messages, FEC in the MPLS LSP PING request messages and described in establishment
The Route Distinguisher information known in BFD conversation procedures carries out the matching and verification of the BFD sessions.
Specific embodiment
In the networking diagram shown in Fig. 2, the system that BFD detections are established for MPLS lsp tunnels includes source LSP equipment
With egress LSP equipment, the source equipment that the embodiment of the present invention is proposed and egress equipment all same, source equipment is as MPLS
The active method, apparatus that LSP BFD are initiated, the passive method, apparatus that egress equipment is initiated as MPLS LSP BFD；The embodiment of the present invention
By extending the MPLSLSP Ping messages, pass through MPLS Router ID TLV described in MPLS LSP Ping messages.
It is described for the ease of description following steps with the networking diagram shown in Fig. 2, still with source LSP equipment, egress
Exemplified by LSP equipment, following steps are specifically included：
Step S1, masters of the source LSP equipment as MPLS LSP BFD, actively initiate BFD detections；
Step S2, source LSP equipment construct MPLS LSP Ping request messages, encapsulate BFDDiscriminator
The definition of TLV and MPLS Router ID TLV, MPLS Router ID TLV referring to attached drawing 3 explanation；
Step S3, egress LSP equipment receive MPLS LSP Ping request messages, the FEC information in message
Local FEC verifications are carried out, if verification is abnormal, according to RFC4379 Protocol answers error messages；Otherwise step S4 is performed；
BFD Discriminator TLV in step S4, egress LSP processing MPLS LSP Ping request messages
With MPL S Router ID TLV, local BFD sessions are carried out according to FEC and Router ID and are matched, if successful match, explanation
It is local to have BFD sessions, then reply messages (or can select not replying reply messages) are directly replied, if do not matched
Success, then explanation is the connection that new BFD sessions are initiated in distal end, new BFD session descriptors is locally-assigned, and start to source
Send BFD detection messages.
If source LSP equipment only encapsulates MPLSRouter ID TLV when constructing MPLS LSP Ping request messages
And unencapsulated BFD Discriminator TLV, in egress LSP equipment detection messages only MPLS Router ID TLV without
There are during BFD Discriminator TLV, can selecting not trigger to create BFD sessions, or egress LSP equipment is only detecting
When carrying BFD Discriminator TLV into MPLS LSP Ping request messages according to FEC and Router ID into
Row local BFD sessions matching.
If egress LSP equipment has been stored with the Router ID of local BFD sessions, and MPLS LSP Ping request
Without Router ID are carried in message, then the two can equally be matched, and MPLS LSP Ping request messages do not trigger life
The BFD sessions of Cheng Xin.
Step S5, source LSP equipment and the BFD of egress LSP opening of device Forwarding plane are detected, and periodicity sending is with receiving
BFD detection messages；
Step S6, source LSP equipment continue periodicity sending MPLS LSP to detect the FEC of control plane at the same time
Ping request messages, and BFD Discriminator TLV and MPLSRouter ID TLV are encapsulated at the same time, source LSP is set
If standby configuration carries BFD Discriminator TLV, it is required to encapsulate MPLS Router ID TLV information at the same time；Egress
LSP repeat steps S3.
In the present embodiment, even if the forward-path of the LSP in Fig. 2 changes, MPLS LSP in step S6 are caused
The information such as the source IP address in Ping request messages, purpose IP address change, but due to effectively using
MPLS Router ID TLV, ensure that to be transmitted using fixed Router ID all the time, so walked in egress processing
During rapid S4, it can correctly match and associate established BFD sessions, avoid the matching of mistake and cause BFD session mistakes
Report an error.
In conclusion cause to become in path present invention efficiently solves MPLS LSP BFD testing mechanisms in existing standard
During change, the problem of BFD detection error detection Down, there is provided a kind of simple, reliable MPLS LSP BFD detection methods, ensure
The accuracy of MPLS LSP BFD detection.Meanwhile the present invention is complete compatible with existing standard.
It should be noted that in the case where there is no conflict, the feature in embodiment and embodiment in the application can phase
Mutually any combination.
Certainly, the present invention can also have other various embodiments, ripe in the case of without departing substantially from spirit of the invention and its essence
Various corresponding changes and deformation, but these corresponding changes and deformation can be made according to the present invention by knowing those skilled in the art
The protection domain of appended claims of the invention should all be belonged to.
One of ordinary skill in the art will appreciate that all or part of step in the above method can be instructed by program
Related hardware is completed, and described program can be stored in computer-readable recording medium, such as read-only storage, disk or CD
Deng.Alternatively, all or part of step of above-described embodiment can also be realized using one or more integrated circuits.Accordingly
Ground, each module/unit in above-described embodiment can be realized in the form of hardware, can also use the shape of software function module
Formula is realized.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (8)
1. a kind of method for ensureing two-way converting detection reliability, wherein, in the case where there is multipath in LSP sources,
Source equipment asks report in the MPLS LSP PING that the Route Distinguisher information for carrying source equipment is sent to egress equipment
Text, Route Distinguisher information and FEC of the egress equipment in the MPLS LSP PING request messages uniquely determine
BFD sessions；
The mode that the Route Distinguisher information is carried in MPLS LSP PING request messages is in the MPLS LSP PING
Increase indicates the type lengths values of the Route Distinguisher information in request message；
Wherein, Route Distinguisher information, specifically includes：Route Distinguisher Router ID.
2. the method as described in claim 1, it is characterised in that
After the egress equipment receives the MPLS LSP PING request messages, according to the MPLS LSP PING request messages
In Route Distinguisher information and the FEC when not matching BFD sessions, create new BFD sessions.
3. method as claimed in claim 2, it is characterised in that
For the source equipment after BFD conversation establishings success, periodicity sending carries BFD descriptors and the route at the same time
The MPLS LSP PING request messages of identification information, after the egress equipment receives the MPLS LSP PING request messages,
The matching and verification of the BFD sessions are carried out according to the descriptor and the Route Distinguisher information.
4. method as claimed in claim 2, it is characterised in that
For the source equipment after BFD conversation establishings success, periodicity sending does not carry the MPLS of Route Distinguisher information
LSP PING request messages, after the egress equipment receives the MPLS LSP PING request messages, according to the MPLS LSP
FEC in PING request messages and the Route Distinguisher information known in the BFD conversation procedures are created carry out the BFD
The matching and verification of session.
5. a kind of label switched path equipment for ensureing two-way converting detection reliability, wherein, there is multipath in LSP sources
In the case of,
The label switched path equipment, during for as source equipment, the route for carrying source equipment is sent to egress equipment
The MPLSLSP PING request messages of identification information；When being additionally operable to as egress equipment, according to from the received MPLS of source equipment
Route Distinguisher information and forwarding equivalence class FEC in LSP PING request messages uniquely determine two-way converting detection BFD sessions；
The mode that the label switched path equipment carries the Route Distinguisher information in MPLS LSP PING request messages is
Increase indicates the type lengths values of the Route Distinguisher information in the MPLS LSP PING request messages；
Wherein, Route Distinguisher information, specifically includes：Route Distinguisher Router ID.
6. label switched path equipment as claimed in claim 5, it is characterised in that
The label switched path equipment, when being additionally operable to as egress equipment, receives the MPLS LSP PING request messages
Afterwards, when the Route Distinguisher information in the MPLS LSP PING request messages and the FEC do not match BFD sessions,
Create new BFD sessions.
7. label switched path equipment as claimed in claim 6, it is characterised in that
The label switched path equipment, when being additionally operable to as source equipment, after BFD conversation establishings success, periodically
Send and carry BFD descriptors and the MPLS LSP PING request messages of the Route Distinguisher information at the same time；It is additionally operable to as egress
During equipment, after receiving the MPLS LSP PING request messages, institute is carried out according to the descriptor and the Route Distinguisher information
State the matching and verification of BFD sessions.
8. label switched path equipment as claimed in claim 6, it is characterised in that
The label switched path equipment, when being additionally operable to as source equipment, after BFD conversation establishings success, periodically
The MPLS LSP PING request messages for not carrying Route Distinguisher information are sent, when being additionally operable to as egress equipment, are received described
After MPLS LSP PING request messages, FEC in the MPLS LSP PING request messages and the BFD is being created
The Route Distinguisher information known in conversation procedure carries out the matching and verification of the BFD sessions.
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| CN102769543B (en) * | 2012-07-20 | 2015-05-20 | 杭州华三通信技术有限公司 | BFD (Bidirectional Forwarding Detection) method and equipment based on LSP (Label Switching Path) |
| CN104040984B (en) | 2012-11-13 | 2017-05-10 | 华为技术有限公司 | Bidirectional forwarding detection (BFD) session negotiation method, device and system |
| US9979515B2 (en) | 2014-06-30 | 2018-05-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Control for BFD return path |
| CN107846292B (en) | 2016-09-19 | 2020-12-04 | 新华三技术有限公司 | Method and device for preventing fault processing delay |
| CN108123875B (en) * | 2016-11-29 | 2021-11-05 | 中兴通讯股份有限公司 | Bidirectional forwarding detection method and device |
| US10447586B2 (en) * | 2017-06-01 | 2019-10-15 | Zte Corporation | Defect detection in IP/MPLS network tunnels |
| CN107154882B (en) * | 2017-07-24 | 2019-11-22 | 迈普通信技术股份有限公司 | BFD session establishing method and device |
| CN111614556B (en) | 2019-02-26 | 2023-05-12 | 中兴通讯股份有限公司 | BIER-based two-way forwarding detection session creation method and related equipment |
| CN113132223A (en) * | 2020-01-15 | 2021-07-16 | 华为技术有限公司 | Fault detection method and equipment |
| CN113315701A (en) * | 2020-02-27 | 2021-08-27 | 中兴通讯股份有限公司 | Path detection method, electronic device and storage medium |
| CN113973078A (en) * | 2020-07-06 | 2022-01-25 | 华为技术有限公司 | End-to-end path discovery and use method and device |
| 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 |
| CN117479197A (en) * | 2022-07-29 | 2024-01-30 | 中兴通讯股份有限公司 | Method, device and storage medium for realizing BFD detection in BIER network |
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| CN101453414A (en) * | 2007-11-30 | 2009-06-10 | 华为技术有限公司 | Head node protection method, system and equipment for point to multiple points label switch path |
| CN101447900A (en) * | 2008-12-15 | 2009-06-03 | 华为技术有限公司 | Method, system and device for building bidirectional forwarding detection |
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