CN102136945B - Method for establishing label switch path (LSP) protection and node - Google Patents
Method for establishing label switch path (LSP) protection and node Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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Abstract
The embodiment of the invention discloses a method for establishing label switch path (LSP) protection and a node, relating to the communication field and used for configuring OAM (operations, administration and maintenance) parameters and protection parameters while realizing the establishment of an LSP protection in LSP protection. The method for establishing LSP protection comprises the following steps: receiving an LSP establishment message sent by an uplink node, wherein the LSP establishment message carries the OAM parameters and the protection parameters; and configuring the OAM parameters and the protection parameters.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method for building up and node of LSP protection.
Background technology
Multiprotocol label switching (Multi-Protocol Label Switching, be called for short MPLS) be a kind of system for rapid data packet switch and route, it provides a kind of mode, by Internet protocol (Internet Protocol, IP) address is mapped as the label simply with regular length, for different bags, forwards and packet technology.MPLS, as a kind of group technology of maturation, obtains a wide range of applications in carrier network.Label switched path (Label SwitchedPath, be called for short LSP) be the packet forwarding path that uses mpls protocol to set up, by a series of LSRs and the link between them between mark packets source LSR (Label Switching Router is called for short LSR) and object LSR, formed.In the network protection of MPLS, for the contingent failure situations of network link, in prior art, conventionally there are following three kinds of methods of repairing fault: local reparation, protection are switched, quick heavy-route.It is a kind of method that can recover link or node failure within the shortest time that protection is switched.In protection reversed process, data are switched to from the LSP breaking down protection LSP at reparation point.
For example, the protection in 1: 1 of the LSP shown in Fig. 1, consists of service aisle and protection channel, and wherein service aisle comprises the working LSP of two symmetrical reverse, and protection channel comprises the protection LSP of two symmetrical reverse.In data transmission procedure, whether working LSP is carried out detection of connectivity by operation, management and maintenance (and Maintenance, is called for short OAM for Operations, Administration), current working properly with testing LSP.When working LSP is normal, protection LSP does not generally carry any data.When fault has occurred working LSP, LSP destination node fault detected and source node is passed in report, and it is upper that the transmission of data is just promptly switched to protection LSP, thereby realize the protection to Internet Transmission.Because protection LSP just set up by signaling in advance before fault occurs, the speed that protection is switched is conventionally very fast.After working LSP is recovered normally, according to the recovery pattern of LSP1:1 protection configuration, the transmission of data can be selected to switch back working LSP or remain on protection LSP.
At present, when prior art is set up LSP1:1 protection in network, the LSP1:1 protection of setting up between node A and node F shown in Fig. 1 of take is example, its process is roughly as follows: first by signaling protocol, set up respectively in A → B → C → F and two bi-directional symmetrical LSP(figure of F → C → B → A shown in solid line), then by management, two LSP are bound to service aisle; Set up equally in two protection LSP A → D → E → F, F → E → D → A(figure shown in dotted line) and by management, two LSP are bound to protection channel; Webmaster is distinguished OAM parameter and the Protection parameters of configuration effort passage and protection channel by management; Finally by management, work and protection channel are bound to a LSP1:1 protection group.
Obviously, this deployment way need to carry out respectively the configuration of OAM parameter and Protection parameters after the foundation of finish the work LSP and protection LSP again, and process is loaded down with trivial details, and configuration complexity is higher, has greatly increased the operation cost of operator.
summary of the invention
Embodiments of the invention technical problem to be solved is to provide a kind of method for building up and node of LSP protection; can realize LSP protection when setting up; carry out the configuration of OAM parameter and Protection parameters, thereby simplified the establishment step of LSP, reduced the complexity of configuration.
For solving the problems of the technologies described above, embodiments of the invention adopt following technical scheme:
A method for building up for LSP protection, comprising:
The LSP that receives upstream node transmission sets up message, and described LSP sets up message and carries operation, management and maintenance parameter and Protection parameters, and described LSP sets up message for expanding the RSVP-TE protocol message after subtype length value Sub-TLV;
Configure described operation, management and maintenance parameter and Protection parameters.
A node, comprising:
Receiving element, for receiving the LSP of upstream node transmission, set up message, described LSP sets up message and carries operation, management and maintenance parameter information and Protection parameters information, and described LSP sets up message for expanding the RSVP-TE protocol message after subtype length value Sub-TLV;
Dispensing unit, for configuring described operation, management and maintenance parameter and Protection parameters.
The method for building up of LSP protection of the present invention; at the LSP that carries OAM parameter and Protection parameters that receives upstream node transmission, set up after message; configuration OAM parameter and Protection parameters; realized LSP protection when setting up; carry out the configuration of OAM parameter and Protection parameters; thereby simplified the establishment step of LSP protection, reduced the complexity of configuration, also reduced operation cost.
accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 sets up the schematic diagram of LSP1:1 protection in prior art protection exchange;
Fig. 2 is the flow chart of the method for building up of LSP protection in the embodiment of the present invention;
Fig. 3 sets up the flow chart of LSP in the embodiment of the present invention;
Fig. 4 is the structural representation of node in the embodiment of the present invention.
embodiment
The method for building up that the embodiment of the present invention provides a kind of LSP to protect, realizes when LSP protection is being set up, carries out the configuration of OAM and Protection parameters, thereby reaches the establishment step of simplifying LSP and protecting, the object that has reduced the complexity of configuration.
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.
Embodiment mono-
In setting up the process of LSP, source node is initiated LSP by agreement and is set up message, and the LSP label of allocation of downlink.In message process, with respect to the node of receipt message, the upstream node of the node that the node that we claim to send message is this receipt message.
The present embodiment provides a kind of method for building up of LSP protection, and as shown in Figure 2, the method comprises:
The LSP that step 101, reception upstream node send sets up message, and LSP sets up message and carries OAM parameter and Protection parameters.
The LSP that node in link receives upstream node transmission sets up message; in the present embodiment; LSP sets up message for setting up a working LSP or protection LSP; LSP sets up and in message, carries OAM parameter and Protection parameters; wherein; OAM parameter comprises path termination source point sign (TrailTermination Source Identifier; be called for short TTSI) and rapid failure detection frequency (FastFailure Detection Frequency; be called for short FFD Frequency), FFD Frequency is message transmission frequency.LSP TTSI is comprised of IP address and the LSP ID of node, for LSP of unique identification.Protection parameters comprises that protection recovers type and Wait to Restore Time.
Node in link, receive that upstream node sends set up the message of LSP time, automatically read LSP and set up OAM parameter and the Protection parameters that message is carried, and configure this OAM parameter and Protection parameters, so that simplified the establishment step of LSP.
The method for building up of the LSP protection of the present embodiment; the method carries OAM parameter by transmission and Protection parameters LSP sets up message; node in link is when the LSP that receives upstream node transmission sets up message; automatically configure OAM parameter and Protection parameters; realized LSP protection when setting up, carried out the configuration of OAM parameter and Protection parameters, thereby simplified the establishment step of LSP; reduce the complexity of configuration, greatly reduced the operation cost of operator.
Embodiment bis-
In the present embodiment; take protection in switching to set up LSP protection in 1: 1 be example; wherein, setting up the agreement that LSP adopts is the RSVP (ResourceReservation Protocol-Traffic Engineering, RSVP-TE) based on traffic engineering expansion.The explicit route object of service aisle (Explicitly Routed Object is called for short ERO) can be determined by following two kinds of modes: by management, set in advance; By routing iinformation, automatically calculate.After the explicit route object of service aisle is determined, determined working LSP the IP of node of process, the working LSP of two bi-directional symmetrical of service aisle is also just definite, and source node is set up uplink and downlink Label Forwarding Information Base by RSVP-TE signaling according to definite working LSP on the all-network node of this LSP process.In the present invention, the direction of the LSP being set out by source node is defined as to up direction, the direction of getting back to the LSP of source node is down direction.
In the flow chart of setting up LSP as shown in Figure 3, source node A initiates LSP by RSVP-TE agreement and sets up message, and distribute source node A to the descending LSP label (being called descending LSP label for identifying the label of descending LSP) of Node B, set up descending LSP label forwarding information table (the 1abel forwarding information base of source node A, LFIB), in the present embodiment, it is PATH message that LSP sets up message, in this message, carry OAM parameter and Protection parameters, source node A configures OAM parameter and Protection parameters first automatically, then PATH message is transmitted to its downstream node, wherein, to the descending LSP label of Node B, upstream distributing labels (Upstearm_Label) object in PATH message carries source node A.
The form of Upsteam Label object is as shown in the table:
Wherein C-Type field is LSP tag types, and in the present embodiment, the value of C-Type is that 2, Class-Num value is 35.The value of C-Type and Class-Num is used for identifying object type.Label field is the label of the descending LSP of upstream node distribution.
Source node A is sent to Node B according to the IP of the next-hop node in ERO (being Node B) by PATH message, in the PATH message that source node A initiates, carries OAM parameter and Protection parameters, and wherein, OAM parameter comprises TTSI and FFD Frequency.LSP TTSI is comprised of IP address and the LSP ID of node, for identifying a LSP.Protection parameters comprises that protection recovers type and Wait to Restore Time.Wherein, OAM parameter and Protection parameters carrying in PATH message is to realize by expansion subtype length value (Sub-type-length-value, Sub-TLV), and TTSI Sub-TLV form is as shown in the table:
TTSI field is set to send to the TTSI of this node of destination node;
FFD Frequency Sub-TLV form is as shown in the table:
Frequency field arranges FFD message transmission frequency;
Protection recovery type and Wait to Restore Time Sub-TLV form are as shown in the table:
The protection of R field sign recovers type, and protection recovers type and is divided into recovery formula or Non revertive; WTR interval field is set to the time of Wait-to-Restore.
Node B receives after the PATH message that carries OAM parameter and Protection parameters of source node A transmission; the up LSP label of distribution node B to the label of the descending LSP of node C and source node A to Node B; set up the descending label forwarding information table of Node B; and the Node B based on distributing is to the Upsteam_Label object in the descending LSP tag update PATH message of node C; be that Label field in Upstearm_Label object is the descending LSP label that Node B arrives node C, then PATH message be sent to node C.It should be noted that, in the embodiment of the present invention, except source node and destination node, intermediate node also can carry out the configuration of OAM parameter and Protection parameters.
Equally; node C receives after the PATH message that carries OAM parameter and Protection parameters of upstream node B transmission; the up LSP label of distribution node C to the label of the descending LSP of F and Node B to node C; set up the descending label forwarding information table of node C; node C based on distributing, to the Upsteam_Label object in the descending LSP tag update PATH message of destination node F, is then sent to message destination node F.
Destination node F receives after the PATH message that carries OAM parameter and Protection parameters of upstream node A transmission, automatically configure OAM parameter and Protection parameters, according to the node C receiving, to the descending LSP label of destination node F, set up the descending LSP label forwarding information table of destination node F, the foundation of descending LSP can complete, then distribution node C is to the label of the up LSP of destination node F, set up up LSP label forwarding information table, generate RESV message, to the up LSP label of destination node F, the Label object in RESV message carries node C, then destination node F is sent to node C by RESV message.Wherein, OAM parameter and Protection parameters in RESV message can be default, also portability, and while carrying, the particular content of OAM parameter and Protection parameters, form, with above, do not repeat them here.Label Format Object is as follows,
Wherein Class-Num value is that 16, C-Type value is 1.
Node C receives after the RESV message that carries OAM parameter and Protection parameters of destination node F transmission; according to the node C receiving, to the up LSP label of destination node F and the Node B of node C oneself distribution, arrive the up LSP label of node C; set up up LSP Label Forwarding Information Base; and the Node B of distributing according to node C is to the up LSP label of node C; node C upgrades the Label object in RESV message; be that Label field in Label object is the up LSP label that Node B arrives node C, then RESV message be sent to Node B.
Node B receives after the RESV message that carries OAM parameter and Protection parameters of upstream node C transmission; the source node A distributing to up LSP label and the Node B oneself of destination node C according to the Node B receiving is to the up LSP label of Node B; Node B is set up up LSP label forwarding information table; the source node A distributing based on Node B is to the Label object in the up LSP tag update RESV message of Node B; be Label field in Label object be A to the up LSP label of B, then RESV message is sent to source node A.
Source node A receives after RESV message, sets up the up LSP label forwarding information table of source node A according to the node A receiving to the up LSP label of destination node B, can complete the foundation of up LSP.
As can be seen here, in the present embodiment, by the signalling interactive process of a REVP-TE, can complete the working LSP of a bi-directional symmetrical, i.e. the foundation of service aisle.
After service aisle has been set up, in the foundation of the automatic trigger protection passage of source node.In the RESV message that service aisle returns in process of establishing, also comprise RECORD_ROUTE object, RECORD_ROUTE object record working LSP the IP of node of process.
The explicit route object of the protection channel corresponding with service aisle can be determined by following two kinds of modes: by management, set in advance; Source node A calculates the path that do not overlap with service aisle as the path of protection channel according to the service aisle having established of RECORD_ROUTE object record.After the explicit route object of protection channel is determined, determined protection LSP the IP of node of process, the protection LSP of two symmetrical reverse of protection channel has also just determined.Source node is set up upstream label by RSVP-TE signaling according to definite protection LSP and is transmitted on the all-network node of this LSP process.
Process of establishing and the parameter configuration process of the concrete process of establishing of protection channel and parameter configuration process and service aisle are above similar, do not repeat them here.
After service aisle and protection channel have been set up, source node A is associated as a protection group by both, and so far, the foundation of LSP protection has just completed.
Further, in setting up the process of service aisle and protection channel, PATH message and RESV message is portability ASSOCIATION object also, and for working LSP and the protection LSP of associated LSP protection, the concrete form of ASSOCIATION object is as shown in the table:
Wherein Association the type field is set to Recovery, and now the implication of representative is that the passage of associated two appointments is as 1: 1 protection group of pair of L SP.Because source node A working LSP before sending LSP to set up message is definite with the ID of protection LSP, therefore AssociationSource field can be set to the IP work ID of source node A, and Association id field is set to the ID of the corresponding LSP of protection channel in the PATH of service aisle message; In the PATH of protection channel message, be set to the ID of the corresponding LSP of service aisle.Like this, when protection channel has been set up, also just automatically service aisle and protection channel are associated as to a protection group.RESV message in like manner.
The method for building up of the LSP protection of the present embodiment, when setting up working LSP or protection LSP, source node initiates to set up the PATH message of LSP by RSVP-TE agreement, and PATH message is sent to downstream node, destination node is set up after message at the LSP that carries OAM parameter and Protection parameters that receives upstream node transmission, automatically configure OAM parameter and Protection parameters, wherein, OAM parameter and Protection parameters carrying by expansion Sub-TLV in PATH message (or RESV message) realized, realized LSP protection when setting up, carry out the configuration of relevant parameter, thereby simplified the establishment step of LSP, reduced the complexity of configuration.The use of Association object, has realized when protection channel has been set up, automatically service aisle and protection channel is associated as to a protection group.Simplify the establishment step of LSP, reduced the complexity of configuration, greatly reduced operation cost.
Embodiment tri-
The present embodiment provides a kind of node, as shown in Figure 4, comprising:
Receiving element 401, sets up message for receiving the LSP of upstream node transmission, and LSP sets up message and carries OAM parameter information and Protection parameters information; Dispensing unit 402, for configuring OAM parameter and Protection parameters.The node of the present embodiment also comprises: transmitting element 403, sends to downstream node for described LSP is set up to message.
Wherein, above-mentioned OAM parameter comprises: path termination source point sign and rapid failure detect frequency; Protection parameters comprises: protection recovers type and Wait to Restore Time.LSP sets up message and also carries ASSOICIATION object.
The method for building up of the LSP of the present embodiment is identical with above-described embodiment two, does not repeat them here.
The node of the present embodiment; at the LSP that carries OAM parameter and Protection parameters that receives upstream node transmission, set up after message; configuration OAM parameter and Protection parameters; realized LSP protection when setting up; carry out the configuration of relevant parameter; thereby simplified the establishment step of LSP, reduced the complexity of configuration.The use of Association object, has realized when protection channel has been set up, automatically service aisle and protection channel is associated as to a protection group.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential common hardware by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Understanding based on such, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium can read, as the floppy disk of computer, hard disk or CD etc., comprise some instructions with so that computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in each embodiment of the present invention.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by the described protection range with claim.
Claims (6)
1. a method for building up for LSP protection, is characterized in that, comprising:
The LSP that receives upstream node transmission sets up message, described LSP sets up message and carries operation, management and maintenance parameter and Protection parameters, described LSP sets up message and also carries ASSOCIATION object, described ASSOCIATION object is for related job LSP and protection LSP, and described LSP sets up message for expanding the RSVP-TE protocol message after subtype length value Sub-TLV;
Configure described operation, management and maintenance parameter and Protection parameters.
2. method according to claim 1, is characterized in that, the LSP sending at described reception upstream node also comprises after setting up message:
Described LSP is set up to message and send to downstream node, described LSP sets up message and carries operation, management and maintenance parameter and Protection parameters.
3. method according to claim 1 and 2, is characterized in that,
Described operation, management and maintenance parameter comprise: path termination source point sign and rapid failure detect frequency,
Described Protection parameters comprises: protection recovers type and Wait to Restore Time.
4. a node, is characterized in that, comprising:
Receiving element, for receiving the LSP of upstream node transmission, set up message, described LSP sets up message and carries operation, management and maintenance parameter information and Protection parameters information, described LSP sets up message and also carries ASSOCIATION object, described ASSOCIATION object is for related job LSP and protection LSP, and described LSP sets up message for expanding the RSVP-TE protocol message after subtype length value Sub-TLV;
Dispensing unit, for configuring described operation, management and maintenance parameter and Protection parameters.
5. node according to claim 4, is characterized in that, also comprises:
Transmitting element, sends to downstream node for described LSP is set up to message.
6. according to the node described in claim 4 or 5, it is characterized in that,
Described operation, management and maintenance parameter comprise: path termination source point sign and rapid failure detect frequency,
Described Protection parameters comprises: protection recovers type and Wait to Restore Time.
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| CN201110039076.1A CN102136945B (en) | 2011-02-16 | 2011-02-16 | Method for establishing label switch path (LSP) protection and node |
| PCT/CN2011/080806 WO2012109907A1 (en) | 2011-02-16 | 2011-10-14 | Method for establishing lsp protection, and node |
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| CN102136945B (en) * | 2011-02-16 | 2014-03-12 | 华为技术有限公司 | Method for establishing label switch path (LSP) protection and node |
| US20150138958A1 (en) * | 2012-04-18 | 2015-05-21 | Telefonaktiebolaget L M Ericsson (Publ) | System and method to send oam packets on redundancy paths |
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| CN1510874A (en) * | 2002-12-26 | 2004-07-07 | ��Ϊ��������˾ | Method for constructing bidirectional lable swap path in optical network |
| US7373401B1 (en) * | 2001-12-31 | 2008-05-13 | Nortel Networks Limited | Label switched path OAM wrapper |
| CN101471813A (en) * | 2007-12-29 | 2009-07-01 | 华为技术有限公司 | Configuration method, system and equipment for implementing domain-striding maintenance management |
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| CN100514965C (en) * | 2005-06-08 | 2009-07-15 | 华为技术有限公司 | Method for detecting label switching path connectivity |
| CN101192990A (en) * | 2006-11-30 | 2008-06-04 | 华为技术有限公司 | A method and device and system for quick rerouting in MPLS network |
| CN101355441B (en) * | 2007-07-27 | 2012-04-04 | 华为技术有限公司 | Method, system and equipment for configuring operation management maintain attribute |
| CN101964743A (en) * | 2009-07-24 | 2011-02-02 | 华为技术有限公司 | Multiprotocol label-switched path APS (Active Protection System) protection and management method, equipment and system |
| CN102136945B (en) * | 2011-02-16 | 2014-03-12 | 华为技术有限公司 | Method for establishing label switch path (LSP) protection and node |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7373401B1 (en) * | 2001-12-31 | 2008-05-13 | Nortel Networks Limited | Label switched path OAM wrapper |
| CN1510874A (en) * | 2002-12-26 | 2004-07-07 | ��Ϊ��������˾ | Method for constructing bidirectional lable swap path in optical network |
| CN101471813A (en) * | 2007-12-29 | 2009-07-01 | 华为技术有限公司 | Configuration method, system and equipment for implementing domain-striding maintenance management |
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