CN101986622A - Method and system for automatically identifying state attribute of path computation element (PCE) - Google Patents

Method and system for automatically identifying state attribute of path computation element (PCE) Download PDF

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Publication number
CN101986622A
CN101986622A CN2010105366251A CN201010536625A CN101986622A CN 101986622 A CN101986622 A CN 101986622A CN 2010105366251 A CN2010105366251 A CN 2010105366251A CN 201010536625 A CN201010536625 A CN 201010536625A CN 101986622 A CN101986622 A CN 101986622A
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pce
state
status attribute
control plane
plane node
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CN101986622B (en
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王志宏
谢刚
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2011/073814 priority patent/WO2012062091A1/en
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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

Abstract

The invention discloses a method for automatically identifying the state attribute of a path computation element (PCE), which comprises the following steps that: the PCE adds the state attribute representation capability of the PCE into automatic discovery information and diffuses and spreads the state attribute of the PCE through a flooding mechanism of a link state routing protocol; and a control plane node receives the automatic discovery information through the link state routing protocol and identifying the state attribute of the PCE by analyzing and comparing the automatic discovery information. The invention also discloses a system for automatically identifying the state attribute of the PCE. An identification unit in the system is used for the control plane node to receive the automatic discovery information through the link state routing protocol and identify the state attribute of the PCE by analyzing and comparing the automatic discovery information. By the method and the system, the state attribute of the PCE can be automatically identified by a PCE automatic discovery mechanism.

Description

A kind of automatic identifying method of PCE status attribute and system
Technical field
The present invention relates to the control technology of path-calculating element in the intelligent bearer network (PCE, Path ComputationElement), relate in particular to a kind of automatic identifying method and system of PCE status attribute.
Background technology
Along with the quick growth of IP operation, the demand of the network bandwidth is not only become increasing, and because the uncertainty and the Unpredictability of IP operation amount itself are also more and more urgent to the dynamic assignment demand of the network bandwidth.Traditional mainly easily make mistakes by the original method time and effort consuming that the network connection manually is set not only is difficult to adapt to the needs that modern network and new business provide expansion, also is difficult to adapt to the needs of market competition.A kind of can finish automatically that network connects the new network notion--ASON (ITU-T SG15 called after ASON) arises at the historic moment.This is a kind ofly to utilize independent ASON control plane to implement (comprising SDH, PTN or OTN) network of automatic connection management by various transmission nets, and this optical-fiber network with independent control plane is called ASON.
ASON has automatic discovery feature, comprises the variation that can automatically find business, topology, resource; Have strong calculation function, can calculate according to these variations of network environment, analysis, reasoning and judgement, finally make decision according to this principle of effective distribution of resources; Ability is set up in connection with Fast Dynamic, and protection and restore funcitons can be provided for the business of needs; Service dissimilar, different priorities etc. can be provided.
Along with multiprotocol label switching (mpls)/general multiple protocols label exchange (GMPLS) networks development, network topology becomes increasingly complex, and the route amount is very huge, and path computing also becomes increasingly complex.And the deployment of traffic engineering, need the network equipment under the constraints of complexity, to calculate route, these constraintss not only comprise static constraint, as the distance between router node, bandwidth, the capacity of trunk of optical network device etc., also comprise dynamic constraints, as network failure state, network congestion information etc.Path computing based on constraint, it is a basic function module in the MPLS/GMPLS network traffic engineering, especially in the multistage MPLS/GMPLS network of large-scale multiple domain, at quantity huge path and complicated constraints, the desired path computing of traffic engineering need be coordinated different network domains and special computing function.For example in one n the full internet of node single domain single-stage, the quantity in path is n * (n-1)/2 in the network, for under the situation of network failure or exception of network traffic variation, can recover or dredge Network rapidly by traffic engineering, requirement calculates optimal recovery or circuitous path according to various constraintss at the input meshed network equipment of malfunctioning node or abnormal flow in the short as far as possible time, the shortening of computing time means the raising of resume speed, best path means the raising of network utilisation efficient, the calculating of this complexity often needs the understanding to network global Topological Structure and constraints, need a large amount of CPU computational resources to move complicated algorithm, and when a large amount of cpu resources apply in the path computing, stability and stablizing of whole network to the network equipment have all been caused certain impact, and all these are challenges greatly for the network equipment.
In order to address this problem, IETF PCE working group has proposed the MPLS/GMPLS network configuration based on PCE, in this structure, PCE is a functional entity of being responsible for path computing in the network specially, it is based on known network topology structure and constraints, calculates an optimal path that satisfies constraints according to the request of path computing client.PCE can be arranged in network Anywhere, can be integrated in network device internal, as is integrated in Label Switching Routers (LSR) inside, also can be a separate equipment.Path computing client (PCC, Path Computation Clients) communicates by letter by special path computation protocols (PCE Communication Protocol) and between the PCE and between PCE and the PCE, submit to path computing request also to obtain the path computing result.PCC can be LSR or the network management system (nms) in the MPLS/GMPLS network.
According to the definition of RFC 4655, PCE can be divided into two kinds of state and stateless.Information in stateless PCE the use traffic engineering data base (TED) is carried out path computing, and the PCE that state arranged when path computing not only based on the topology information in the traffic engineering database (TED), also to utilize the information in existing path and occupied resource in the network.Owing to there is state PCE to have more information, have the path computing ability that is better than stateless PCE on the one hand, should preferably have state PCE under the equal conditions, in some cases, even can only use state PCE to carry out path computing; The additional demand that also having synchronously of resource information is different from stateless PCE on the other hand, therefore, the status attribute of PCE (being whether PCE is by state PCE is arranged) is discerned by other PCE in PCC and the territory with regard to necessary, states scene description as follows:
Scene one: synchronous between control plane and PCE.Have the PCE of state need preserve existing professional routing information in the existing network, therefore when service condition changed (set up, delete), business change information must in time be synchronized to the PCE of state.For reaching this purpose, the control plane node need identify the status attribute with the PCE that session relationship is arranged self.
Scene two: under many PCE of single domain scene, synchronous between PCE.Having under the situation of session relationship with control plane, having the PCE of state to guarantee the oneself state information accuracy by synchronization mechanism with the control plane node.When in the territory a plurality of PCE being arranged, can not guarantee that all PCE and all control plane node all keep normal session relationship at any time.For this reason, need set up synchronized relation having between the PCE of state, when a PCE obtains the service condition change notification, should state PCE be arranged to what this information in time was diffused into adjacency, to guarantee that all have the consistency and the correctness of state PCE service condition in the territory, promptly when in the territory a plurality of PCE being arranged, having between the PCE of state needs to identify each other its status attribute, could set up the state synchronized relation.
Scene three: the preferential PCE that selects to have state.Owing to have the path computing quality of state PCE to be better than stateless PCE, so PCC should preferentially select state PCE to carry out path computing under the equal conditions.Therefore, know the status attribute of PCE as PCC after, can on purpose select state PCE to carry out path computing, thereby obtain better path computing result.
By the functional requirement of above-mentioned scene as can be seen: other has state PCE to need to identify the status attribute of PCE in control plane node and the territory, so that realize having the PCE function of state.Based on above description as can be known: as the important attribute of PCE, the status attribute of PCE should be identified by PCC and other PCE timely and accurately.
As the part of control plane auto discovery mechanism, the auto discovery mechanism of PCE is used to make PCC to understand its existence and ability attribute.In order to support the automatic discovery of PCE, PCE working group has expanded relevant Routing Protocol, increase the TLV (PCE Discovery TLV) that a kind of PCE by name finds, PCE Discovery can abbreviate PCED as, then the TLV of PCE discovery can abbreviate PCED TLV as, this TLV is used for the PCE information from flooding is notified with member in the territory in the entire domain relevant information of this PCE, as the PCE position, the scope of PCE path computing is (between the territory, between the AS territory, across a network layer etc.), observability at the PCE in one or more territories, adjacent PCE, information such as communication capacity and path computing ability.
PCED TLV is made up of a series of sub-TLV, and sub-TLV can be placed among the PCEDTLV according to random order.During the Routing Protocol that adopts that Open Shortest Path First (OSPF), defined sub-TLV is as shown in table 1 below:
Sub-TLV type Length Title
?1 Elongated PCE-ADDRESS?sub-TLV
?2 4 PATH-SCOPE?sub-TLV
?3 4 PCE-DOMAIN?sub-TLV
?4 4 NEIG-PCE-DOMAIN?sub-TLV
?5 Elongated PCE-CAP-FLAGS?sub-TLV
Table 1
When adopting Intermediate System-to-Intermediate System (IS-IS) Routing Protocol, defined sub-TLV is as shown in table 2 below:
Sub-TLV type Length Title
?1 Elongated PCE-ADDRESS?sub-TLV
?2 3 PATH-SCOPE?sub-TLV
?3 Elongated PCE-DOMAIN?sub-TLV
?4 Elongated NEIG-PCE-DOMAIN?sub-TLV
?5 Elongated PCE-CAP-FLAGS?sub-TLV
Table 2
Wherein the sub-TLV of the 5th class is used to represent the ability information of PCE, belongs to optional sub-TLV.Article one, can only there be a PCE-CAP-FLAGS sub-TLV among the PCEDTLV at most.If there are many, then have only article one effective.PCE-CAP-FLAGS sub-TLV form as shown in Figure 1, wherein, type (Type) value is 5, length (Length) value is 4 multiple, PCE Capability Flags represents PCE ability label position.
Defined following sign position (the sign bit number is from high to low) in the PCE ability label position, as shown in the following Table 3:
BIT Ability
0 Consider the path computing of GMPLS link constraint
1 Two-way approach calculates
2 Separate path computing
3 The load sharing path computing
4 Synchronous path calculates
5 Support the multiple target path computing
6 Support additional path constraint condition (as maximum hop count)
7 The priority of support path computation requests
8 Support that a piece of news carries a plurality of path computing request
9～31 Reserve the sign position, be made as 0
Table 3
Owing to do not identify PCE status attribute (promptly whether for state PCE is arranged) in the ability label position, therefore, have no way of automatically identifying the PCE status attribute by the PCE auto discovery mechanism in the external world, whether be PCE that state arranged, this selects PCE to PCC and has that scene such as synchronous has caused influence between state PCE if promptly automatically identifying a PCE.Press for a kind of automatic identifying schemes of PCE status attribute at present.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of automatic identifying method and system of PCE status attribute, can automatically identify the PCE status attribute by the PCE auto discovery mechanism.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of automatic identifying method of PCE status attribute, this method comprises: path-calculating element (PCE) adds the status attribute of PCE and represents ability in automatic discovery information, and PCE is by the flooding mechanism diffusion of link-state routing protocol and the status attribute of propagation PCE; The control plane node is received described automatic discovery information by link-state routing protocol, identifies the status attribute of described PCE by the analysis and comparison to automatic discovery information.
Wherein, this method also comprises: the control plane node is according to the status attribute of the described PCE that identifies, triggers the control plane node and state synchronized between state PCE is arranged.
Wherein, when the status attribute of described PCE represents that ability adopts the form of ability label position, the status attribute that described control plane node is discerned described PCE specifically comprises: if the status attribute ability label position in the described automatic discovery information that PCE floods, identify described PCE for state PCE is arranged, after then the control plane node receives the described automatic discovery information that PCE floods, according to the status attribute ability label position of carrying in the automatic discovery information, the status attribute that identifies described PCE is for there being state PCE.
Wherein, the control plane node that triggers with have the state synchronized between state PCE specifically to comprise: when connection status sends variation, described control plane node is with the variation of connection status, notice is the PCE that state PCE is arranged with the status attribute that session relationship is arranged oneself and identify PCE, carries out state synchronized;
Wherein, described connection status comprises: the control plane node has new connection to set up or the control plane node has connection deleted.
Wherein, this method also comprises: the control plane node triggers the state synchronized that has between state PCE according to the status attribute of the PCE that identifies.
Wherein, when the status attribute of described PCE represents that ability adopts the form of ability label position, the status attribute that described control plane node is discerned described PCE specifically comprises: if the status attribute ability label position in the described automatic discovery information that PCE floods, identify described PCE for state PCE is arranged, after then the control plane node receives the described automatic discovery information that PCE floods, according to the status attribute ability label position of carrying in the automatic discovery information, the status attribute that identifies described PCE is for there being state PCE.
Wherein, the state synchronized between state PCE that has of triggering specifically comprises: in the status attribute that identifies PCE all is to have to set up the state synchronized relation between the PCE of state PCE; When connection status send to change, the control plane node was the variation of connection status, and notice is the PCE that state PCE is arranged with the status attribute that session relationship is arranged oneself and identify PCE, carries out state synchronized; According to the state synchronized relation of setting up between PCE, know and to carry out the variation of the PCE of state synchronized that notice is set up the PCE of state synchronized relation with it with connection status;
Wherein, described connection status comprises: the control plane node has new connection to set up or the control plane node has connection deleted.
A kind of automatic recognition system of PCE status attribute, this system comprises: recognition unit, be used for PCE and represent ability in the status attribute of automatic discovery information interpolation PCE, PCE by link-state routing protocol the flooding mechanism diffusion and propagate under the situation of status attribute of PCE, the control plane node is received described automatic discovery information by link-state routing protocol, identifies the status attribute of described PCE by the analysis and comparison to automatic discovery information.
Wherein, this system also comprises: the first state synchronized unit, be used for the status attribute of control plane node according to the described PCE that identifies, and trigger the control plane node and state synchronized between state PCE is arranged.
Wherein, this system also comprises: the second state synchronized unit, be used for the status attribute of control plane node according to the PCE that identifies, and trigger the state synchronized that has between state PCE.
PCE of the present invention adds the status attribute of PCE and represents ability in automatic discovery information, PCE is by the flooding mechanism diffusion of link-state routing protocol and the status attribute of propagation PCE; The control plane node is received automatic discovery information by link-state routing protocol, identifies the status attribute of PCE by the analysis and comparison to automatic discovery information.
Adopt the present invention, increased the expression ability of PCE status attribute, propagate this PCE status attribute, this PCE status attribute of final comparison has identified state PCE.Thereby can automatically identify the PCE status attribute by the PCE auto discovery mechanism.
Description of drawings
Fig. 1 is the PCE-CAP-FLAGS sub-TLV structural representation that the present invention relates to;
Fig. 2 is the realization flow schematic diagram of the embodiment of the invention one;
Fig. 3 is the realization flow schematic diagram of the embodiment of the invention two.
Embodiment
Basic thought of the present invention is: PCE adds the status attribute of PCE and represents ability in automatic discovery information, and PCE is by the flooding mechanism diffusion of link-state routing protocol and the status attribute of propagation PCE; The control plane node is received automatic discovery information by link-state routing protocol, identifies the status attribute of PCE by the analysis and comparison to automatic discovery information.
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme.
The solution of the present invention has increased the status attribute of PCE and has represented ability (for example can adopt the mode of ability label position that the PCE status attribute is identified), and the status attribute (promptly whether for state PCE is arranged) of PCE propagated into PCC and other PCE by the PCE auto discovery mechanism, this PCE status attribute of final comparison has identified state PCE, thereby realizes having the automatic recognition function of state PCE.
A kind of automatic identifying method of PCE status attribute, this method mainly comprises following content:
One, the present invention has expanded existing P CE-CAP-FLAGS sub-TLV, increases following content in its ability label position:
BIT Ability
9 State PCE is arranged
PCE-CAP-FLAGS sub-TLV after the expansion has defined following sign position (the sign bit number is from high to low) in its PCE ability label position, as shown in the following Table 4:
BIT Ability
0 Consider the path computing of GMPLS link constraint
1 Two-way approach calculates
2 Separate path computing
3 The load sharing path computing
4 Synchronous path calculates
5 Support the multiple target path computing
6 Support additional path constraint condition (as maximum hop count)
7 The priority of support path computation requests
8 Support that a piece of news carries a plurality of path computing request
9 State PCE (new content of the present invention) is arranged
10～31 Reserve flag bit, be made as 0
Table 4
Two, implementation step of the present invention is as follows:
1.PCE in automatic discovery information, add the expression ability of the status attribute of PCE, express the status attribute (being whether PCE is for there being state PCE) of PCE self.
Here, can represent the status attribute of PCE, by the status attribute of PCE-CAP-FLAGSsub-TLV carrying PCE by PCED TLV.
2.PCE by the flooding mechanism diffusion of link-state routing protocol and the status attribute of propagation PCE.
3. control plane node such as PCC receive automatic discovery information by link-state routing protocol, comprise the status attribute of PCE in the discovery information automatically.
4. control plane node such as PCC according to the status attribute that parses PCE in advance in advance surely of agreement, and identify the status attribute of PCE after status attribute compared.
5, control plane node such as PCC trigger other function according to the status attribute of PCE.
Here, other function of triggering comprises: 1) control plane node and have between state PCE the present invention of application carry out state synchronized; And 2) there is between state PCE the present invention of application carry out state synchronized.
In sum, enforcement of the present invention mainly comprise sign, disseminate the PCE status attribute, step such as identification.Concrete, at sign, be to realize by expansion to PCE-CAP-FLAGS sub-TLV to the sign of PCE status attribute.By increasing PCE ability label position among this PCE-CAP-FLAGSsub-TLV (BIT position 9 increases PCE status attribute sign position), whether be have the PCE status attribute of state PCE represent ability, shown in Fig. 1 and table 4 if making this PCE-CAP-FLAGS sub-TLV possess PCE.At disseminating, disseminating of PCE status attribute is that flooding mechanism by link-state routing protocol carries out.At identification, the identification of PCE status attribute is by the analysis and comparison of PCE-CAP-FLAGS sub-TLV are finished.As seen: compared with prior art, the present invention is by expanding the ability label position of the sub-TLV of PCE-CAP-FLAGS, the feasible external world can know whether a PCE is the ability attribute information that state PCE is arranged by the PCE auto discovery mechanism, path computing quality and efficient have been improved, and strengthened flexibility based on the realization of other function that state PCE is arranged, for example: make PCC have more specific aim, simplify PCE state synchronized flow process to the selection of PCE.
Below to the present invention's elaboration of giving an example.
Embodiment one: control plane node and state synchronized between state PCE (being above-mentioned scene one) is arranged.
As shown in Figure 2, present embodiment may further comprise the steps:
Step 101, the PCE-A automatic discovery information that floods.Automatically the status attribute of adding PCE in the discovery information is represented ability, is specially carrying PCE status attribute sign in the discovery information automatically, and this sign is used for sign " PCE-A is for there being state PCE ".
Step 102, control plane node receive the automatic discovery information that PCE-A floods, and according to the definition of related bits position among the PCE-CAP-FLAGS sub-TLV in this automatic discovery information, the status attribute that identifies PCE-A is for there being state PCE.
Step 103, control plane node initiate to set up PCEP session (only considering PCC initiation session situation herein) with PCE-A.
Step 104, set up successfully with the PCEP session of PCE-A.
Step 105, the PCE-B automatic discovery information that floods, the PCE status attribute is designated " stateless PCE ".
Step 106, control plane node receive the automatic discovery information that PCE-B floods, and according to the definition of related bits position among the PCE-CAP-FLAGS sub-TLV in this information, the status attribute that identifies PCE-B is stateless PCE.
Step 107, control plane node initiate to set up PCEP session (only considering PCC initiation session situation herein) with PCE-B.
Step 108, set up successfully with the PCEP session of PCE-B.
Step 109, control plane node have new connection to set up.
Step 110, control plane node will newly connect the information of foundation notify with session relationship oneself arranged state PCE arranged, its reason is: PCE-A has state PCE, so notify PCE-A.PCE-B is stateless PCE, therefore can not get notice.
Step 111, PCE-A increase the access path state information according to notification message.
Step 112, control plane node have connection deleted.
Step 113, control plane node will connect deletion information notify with session relationship oneself arranged state PCE arranged, its reason is: PCE-A has state PCE, so notify PCE-A.PCE-B is stateless PCE, therefore can not get notice.
Step 114, PCE-A are according to notification message deletion access path state information.
In the above-mentioned steps, step 101, step 102, step 105, step 106, step 109, step 110～step 114 are particularly crucial.
Embodiment two: the state synchronized (being above-mentioned scene two) between state PCE is arranged.
As shown in Figure 3, present embodiment may further comprise the steps:
Step 201, the PCE-A automatic discovery information that floods.Automatically the status attribute of adding PCE in the discovery information is represented ability, is specially carrying PCE status attribute sign in the discovery information automatically, and this sign is used for sign " PCE-A is for there being state PCE ".
Step 202, control plane node a receive the automatic discovery information that PCE-A floods, and according to the definition of related bits position among the PCE-CAP-FLAGS sub-TLV in this information, the status attribute that identifies PCE-A is for there being state PCE.
Step 203, control plane node a initiate to set up PCEP session (only considering PCC initiation session situation herein) with PCE-A.
The PCEP session of step 204, control plane node a and PCE-A is set up successfully.
Step 205, the PCE-B automatic discovery information that floods.
Step 206, control plane node b receive the automatic discovery information that PCE-B floods, and according to the definition of related bits position among the PCE-CAP-FLAGS sub-TLV in this information, the status attribute that identifies PCE-B is for there being state PCE.
Step 207, control plane node b initiate to set up PCEP session (only considering PCC initiation session situation herein) with PCE-B.
The PCEP session of step 208, control plane node b and PCE-B is set up successfully.
Step 209, PCE-B receive the automatic discovery information that PCE-A floods, and according to the definition of related bits position among the PCE-CAP-FLAGS sub-TLV in this information, the status attribute that identifies PCE-A is for there being state PCE.
Step 210, PCE-B initiate to set up PCEP session (only considering initiatively initiation session situation of PCE-B herein) with PCE-A.
PCEP session between step 211, PCE-A and PCE-B is set up and is finished.
Step 212, since PCE-A for state PCE is arranged, so PCE-B initiates and PCE-A sets up state synchronized and concerns.
Step 213, the relation of the state synchronized from PCE-B to PCE-A are set up successfully.
Step 214, PCE-A receive the automatic discovery information that PCE-B floods, and according to the definition of related bits position among the PCE-CAP-FLAGS sub-TLV in this information, the status attribute that identifies PCE-B is for there being state PCE.
Step 215, since PCE-B for state PCE is arranged, so PCE-A initiates and PCE-B sets up state synchronized and concerns.
Step 216, the relation of the state synchronized from PCE-A to PCE-B are set up successfully.
Connection status takes place and changes (setting up or deletion) in step 217, control plane node a.
Step 218, control plane node a with the connection status change information notify with session relationship oneself arranged state PCE arranged, PCE-A has state PCE, so notify PCE-A.Therefore PCE-B and node a sessionless relation can not get notice.
Step 219, PCE-A upgrade the access path state information according to the connection status change notification message.
Step 220, owing to there is state synchronized relation from PCE-A to PCE-B, so PCE-A notifies PCE-B with state change information.
Step 221, PCE-B upgrade the access path state information according to the connection status change notification message.
Connection status takes place and changes (setting up or deletion) in step 222, control plane node b.
Step 223, control plane node b with the connection status change information notify with session relationship oneself arranged state PCE arranged, PCE-B has state PCE, so notify PCE-B.Therefore PCE-A and node b sessionless relation can not get notice.
Step 224, PCE-B upgrade the access path state information according to the connection status change notification message.
Step 225, owing to there is state synchronized relation from PCE-B to PCE-A, so PCE-B notifies PCE-A with state change information.
Step 226, PCE-A upgrade the access path state information according to the connection status change notification message.
In the above-mentioned steps, step 201, step 202, step 206, step 209, step 212～step 226 are particularly crucial.
A kind of automatic recognition system of PCE status attribute, this system comprises: recognition unit, recognition unit is used for PCE and represents ability in the status attribute of automatic discovery information interpolation PCE, PCE by link-state routing protocol the flooding mechanism diffusion and propagate under the situation of status attribute of PCE, the control plane node is received automatic discovery information by link-state routing protocol, identifies the status attribute of PCE by the analysis and comparison to automatic discovery information.
Here, this system also comprises: the first state synchronized unit, the first state synchronized unit are used for the status attribute of control plane node according to the described PCE that identifies, trigger the control plane node and state synchronized between state PCE is arranged.
In, this system also comprises: the second state synchronized unit, the second state synchronized unit are used for the status attribute of control plane node according to the PCE that identifies, and trigger the state synchronized that has between state PCE.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims (10)

1. the automatic identifying method of a PCE status attribute, it is characterized in that, this method comprises: path-calculating element (PCE) adds the status attribute of PCE and represents ability in automatic discovery information, and PCE is by the flooding mechanism diffusion of link-state routing protocol and the status attribute of propagation PCE; The control plane node is received described automatic discovery information by link-state routing protocol, identifies the status attribute of described PCE by the analysis and comparison to automatic discovery information.
2. method according to claim 1 is characterized in that, this method also comprises: the control plane node is according to the status attribute of the described PCE that identifies, triggers the control plane node and state synchronized between state PCE is arranged.
3. method according to claim 2, it is characterized in that, when the status attribute of described PCE represents that ability adopts the form of ability label position, the status attribute that described control plane node is discerned described PCE specifically comprises: if the status attribute ability label position in the described automatic discovery information that PCE floods, identify described PCE for state PCE is arranged, after then the control plane node receives the described automatic discovery information that PCE floods, according to the status attribute ability label position of carrying in the automatic discovery information, the status attribute that identifies described PCE is for there being state PCE.
4. method according to claim 3, it is characterized in that, the control plane node that triggers with have the state synchronized between state PCE specifically to comprise: when connection status sends variation, described control plane node is with the variation of connection status, notice is the PCE that state PCE is arranged with the status attribute that session relationship is arranged oneself and identify PCE, carries out state synchronized;
Wherein, described connection status comprises: the control plane node has new connection to set up or the control plane node has connection deleted.
5. method according to claim 1 is characterized in that, this method also comprises: the control plane node triggers the state synchronized that has between state PCE according to the status attribute of the PCE that identifies.
6. method according to claim 5, it is characterized in that, when the status attribute of described PCE represents that ability adopts the form of ability label position, the status attribute that described control plane node is discerned described PCE specifically comprises: if the status attribute ability label position in the described automatic discovery information that PCE floods, identify described PCE for state PCE is arranged, after then the control plane node receives the described automatic discovery information that PCE floods, according to the status attribute ability label position of carrying in the automatic discovery information, the status attribute that identifies described PCE is for there being state PCE.
7. method according to claim 6 is characterized in that, the state synchronized between state PCE that has of triggering specifically comprises: in the status attribute that identifies PCE all is to have to set up the state synchronized relation between the PCE of state PCE; When connection status send to change, the control plane node was the variation of connection status, and notice is the PCE that state PCE is arranged with the status attribute that session relationship is arranged oneself and identify PCE, carries out state synchronized; According to the state synchronized relation of setting up between PCE, know and to carry out the variation of the PCE of state synchronized that notice is set up the PCE of state synchronized relation with it with connection status;
Wherein, described connection status comprises: the control plane node has new connection to set up or the control plane node has connection deleted.
8. the automatic recognition system of a PCE status attribute, it is characterized in that, this system comprises: recognition unit, be used for PCE and represent ability in the status attribute of automatic discovery information interpolation PCE, PCE by link-state routing protocol the flooding mechanism diffusion and propagate under the situation of status attribute of PCE, the control plane node is received described automatic discovery information by link-state routing protocol, identifies the status attribute of described PCE by the analysis and comparison to automatic discovery information.
9. system according to claim 8 is characterized in that, this system also comprises: the first state synchronized unit, be used for the status attribute of control plane node according to the described PCE that identifies, and trigger the control plane node and state synchronized between state PCE is arranged.
10. system according to claim 8 is characterized in that, this system also comprises: the second state synchronized unit, be used for the status attribute of control plane node according to the PCE that identifies, and trigger the state synchronized that has between state PCE.
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