WO2008154848A1

WO2008154848A1 - Method for acquiring ability information of net node between domains, net node and communication system

Info

Publication number: WO2008154848A1
Application number: PCT/CN2008/071300
Authority: WO
Inventors: Qiming Li; Hongmiao Xia
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-06-15
Filing date: 2008-06-13
Publication date: 2008-12-24
Also published as: CN101325542A; CN101325542B

Abstract

A method for acquiring ability information of net node between domains, net node and communication system. The first PCE in the first domain sends an ability information query request to the second PCE in the second domain. The first PCE receives the ability information query result returned by the second PCE, and gets the ability information of at least one PCE in the second domain. The first PCE saves the ability information of at least one PCE in the second domain. The PCE includes: the ability requesting unit, the ability receiving unit and the storing unit. Or, the PCE includes: the first request receiving unit and the ability sending unit.

Description

Method for acquiring inter-domain network node capability information, network node and communication system The application claims to be submitted to the Chinese Patent Office on June 15, 2007, the application number is 200710127017.3, and the invention name is "acquisition method of inter-domain PCE capability information, PCE and Priority of the Chinese Patent Application for the Capability Acquisition Device, the entire contents of which are incorporated herein by reference. Technical field

The present invention relates to the field of communications, and in particular, to an acquisition method, a network node, and a communication system for inter-domain network node capability information.

Background technique

The Traffic Engineering (TE) network has a good Quality of Service (QoS) guarantee mechanism and reserves network resources for each Label Switch Path (LSP). Among them, a route calculation technology adopted by the TE network is called centralized routing.

The centralized routing technology mainly separates the routing calculation function of the network node. This paper calls the independent routing calculation function as: PCE (Path Computation Element, network node, application or network based on constraints and network topology calculation network path) In the embodiment of the present invention, the PCE is described by a node, and the same is the same as the module, such as a router and a route calculation server. As the network scale continues to expand, different PCEs are used to manage TE information in their respective domains. In the same domain, multiple PCEs can be deployed. In order to meet the needs of route calculation, the topology and TE information of the network are injected into the PCE, and the route calculation task is uniformly assumed by the network.

When the PCC (Path Computation Client, the client that initiates the path calculation request to the PCE, such as a common network element) needs to perform intra-domain route calculation, it only needs to inform the PCE of the first and last nodes of the path and the constraints that need to be met. An appropriate algorithm is called to calculate a route that satisfies the service requirement based on the TE information, and the explicit route object (ERO) information is returned to the node. After receiving the path information, the node can drive the signaling to establish an end-to-end connection.

When performing cross-domain route calculation, the PCE passes the path calculation unit communication protocol (Path

The Computation Element Communication Protocol (PCECP) mechanism communicates and cooperates to calculate an end-to-end complete route. In this process, PCE plays both the role of PCE and the role of PCC. He also needs to send calculation requests (inter-domain calculation request) to PCEs in other domains while undertaking routing tasks for nodes. Other domain PCE route calculation As a result, it is combined into end-to-end complete routing information and finally fed back to the PCC.

In order to efficiently enable PCC to select PCE for route calculation, PCC needs to know the location of PCE in its domain, as well as other PCE capability information related to PCE selection, such as PCE processing capability, calculation specifications and support constraints. When performing cross-domain routing calculation, the PCE in this domain needs to know the related capability information of PCE in other domains.

In order to efficiently perform intra-domain or inter-domain routing calculations, an effective PCE capability acquisition mechanism is needed to meet this demand. The PCE capability acquisition in the domain can be extended to the entire network through the OSPF flooding mechanism by extending the Open Shortest Path First (OSPF) protocol to implement PCE capability information in the domain. . The PCE capability acquisition between domains can be implemented by modifying the Border Gateway Protocol (BGP) to encapsulate the PCE capability information into the extended attributes of BGP to achieve inter-domain diffusion.

In carrying out the creation process of the present invention, the inventors found that at least the following problems exist in the above existing PCE capability acquisition techniques:

The BGP protocol spreads the PCE capability information throughout the network to increase the operational burden of the network, and it is easy to leak the PCE information of the non-related domain to the unrelated nodes, which affects the privacy of the network.

Summary of the invention

The embodiments of the present invention provide a method for acquiring PCE capability information of an inter-domain network node, a network node, and a communication system, so as to reduce the amount of information transmission in the network and reduce the network bearment burden.

To this end, an embodiment of the present invention provides a method for acquiring inter-domain network node capability information, including: a first PCE of a first network domain sends a capability information query request to a second PCE of a second network domain; Receiving the capability information query result returned by the second PCE, to obtain capability information of at least one PCE of the second network domain;

The first PCE saves the obtained capability information of at least one PCE of the second network domain. An embodiment of the present invention further provides a PCE, including:

a capability requesting unit, configured to send a capability information query request to the first PCE of the neighborhood, and a capability receiving unit, configured to receive a capability information query result of the first PCE feedback of the neighborhood, to obtain at least one PCE of the neighborhood Capability information;

And a storage unit, configured to store capability information of the at least one PCE of the neighborhood received by the capability receiving unit. An embodiment of the present invention further provides a PCE, including:

a first request receiving unit, configured to receive a capability information query request from the foreign PCE, and a capability sending unit, configured to send, according to the first request receiving unit, the capability information query request, to send at least one of the network domains where the PCE is located The capability information of the PCE is given to the foreign PCE.

An embodiment of the present invention is also a communication system, the communication system comprising: a first network domain having at least one PCE and a second network domain having at least one PCE,

The first PCE of the first network domain sends a capability information query request to the second PCE of the second network domain;

Receiving, by the first PCE, a capability information query result returned by the second PCE, to obtain capability information of at least one PCE of the second network domain;

The first PCE saves the obtained capability information of at least one PCE of the second network domain. The above technical solution can be seen that, since the PCE actively and selectively queries the capability information of the neighboring PCE, it does not request other unrelated PCE capability information, and realizes on-demand acquisition. Compared with the prior art, the information flooding method is used to spread the capability, which may cause network congestion. The embodiments of the present invention can acquire the capability in a point-to-point manner, reduce the amount of information transmission in the network, and thus reduce the network carrying burden; The local PCE can selectively query the PCE capability information of the neighboring domain, reduce the amount of information maintenance of the local PCE, and reduce the complexity of the PCE selection. Moreover, because the peer-to-peer acquisition capability information does not spread through the protocol, the inter-domain can be implemented. PCE capability information is kept confidential.

DRAWINGS

1 is a flowchart of a method for acquiring PCE capability information of an inter-domain network node according to the present invention; FIG. 2 is a flowchart of a method for acquiring a neighboring PCE address in FIG.

3 is a schematic block diagram of the first and second embodiments of the PCE of the present invention;

4 is a schematic block diagram of the third and fourth embodiments of the PCE of the present invention;

Figure 5 is a schematic block diagram of a first embodiment of the capability acquisition device of the present invention.

detailed description

The present invention first provides a basic implementation manner for acquiring an inter-domain network node PCE capability information, including the following steps:

A. The local domain PCE sends a capability information query request to the neighboring PCE.

B. The domain PCE receives the returned capability information query result of the neighboring PCE, and obtains Neighbor PCE capability information;

C. The local domain PCE saves the capability information of the neighboring PCE.

As shown in the above embodiment, the PCE actively requests the PCE capability information of the neighboring PCE, and does not request other unrelated PCE capability information to implement on-demand acquisition. Compared with the prior art, the information flooding method is used to spread the capability, which may cause network congestion. The embodiments of the present invention can acquire the capability in a point-to-point manner, reduce the amount of information transmission in the network, and thus reduce the network carrying burden; The local PCE can selectively query the PCE capability information of the neighboring domain, reduce the amount of information maintenance of the local PCE, and reduce the complexity of the PCE selection. Moreover, because the peer-to-peer acquisition capability information does not spread through the protocol, the inter-domain can be implemented. PCE capability information is kept confidential.

The present invention will be further described in detail below with reference to the drawings and embodiments.

Referring to FIG. 1 , it is a flowchart of a method for acquiring PCE capability information of an inter-domain network node according to the present invention. The method can be applied to a TE network, including the steps:

Step 101: Establish a PCECP connection to the neighboring PCE according to the neighbor PCE address; when the system is initialized, the local domain (first domain) PCE can obtain the neighbor (second domain) PCE address; and then in these PCEs A suitable PCE address is selected in the address to establish a PCECP connection to the second domain PCE.

The neighboring PCE address can be obtained by manually configuring the neighboring PCE address or by using an Internal Gateway Protocol (IGP)/BGP. The performing the spreading operation may be to start the capability learning of the inter-domain PCE during the automatic discovery operation of the inter-domain PCE to obtain various neighborhood PCE information including the neighbor PCE address. In addition, the method for obtaining the neighborhood PCE address of the present invention is not limited to the above method, and the neighborhood PCE address can be obtained by any possible means.

The implementation of the present embodiment is performed by a network management system (NMS) through the IGP/BGP protocol to obtain the neighbor PCE address. Referring to FIG. 2, the method for performing the spreading to obtain the neighbor PCE address includes the following steps:

1) The NMS only spreads the PCE address and its domain ID information through network management protocols such as IGP/BGP;

When selecting PCE, the most basic identifier for identifying a PCE is the PCE address information. The PCE's address information can then send messages to it and establish a connection. Because for a specific PCE, its computing ability is basically determined during deployment, and does not change frequently during network operation. Therefore, in this embodiment, the PCE only spreads address information between domains for its own capability information and The domain ID, other capability information does not spread;

The IPE address and the domain ID information can be dynamically advertised through the IGP or BGP protocol. In this embodiment, the distribution or configuration may be performed only between adjacent domains, because the PCE only needs to establish a connection and negotiation with the adjacent PCE when performing cooperative routing. The PCE in this sample can know which PCEs exist in the adjacent domain and what the address is. In the subsequent steps, the PCECP protocol is selectively used to establish a communication connection with the PCE stored in the local address list based on the local policy, and the capability information is obtained, so that each PCE can learn the PCE capability information that needs to be known in the adjacent domain.

2) After receiving the address information of the neighboring PCE and the domain identifier of the domain, the local PCE determines whether the neighboring PCE is in a neighborhood relationship with the local PCE according to the domain identifier of the neighboring PCE. ;

If the local PCE does not know whether the received address information is related to the neighboring PCE, this step may be used to confirm whether the PCE corresponding to the received address information is a neighboring PCE in the neighborhood relationship with the local PCE. Of course, when the local PCE already knows whether the received address information is neighbor PCE related information, the step of confirming and receiving the address information of the neighbor PCE may be omitted.

3) When it is determined that the neighboring PCE and the local PCE are in a neighborhood relationship, the address information of the neighboring PCE is confirmed to be received.

In other embodiments, the automatically discovered neighbor PCE information may include a backup PCE address, a PCE's address range to be calculated, and processing capability (such as CPU performance, memory capacity) in addition to the PCE address and its associated domain ID information. , support intra-domain computing or cross-domain computing, supported path computing capabilities (such as whether to support bandwidth constraints, maximum cost, maximum hop count, whether to support split computing, load sharing, whether to support bidirectional paths), supported interface exchange granularity, Encoding type, whether priority is supported, the maximum requested message length supported, the maximum number of requests that can be carried in a single message, and so on.

When the local PCE itself has a neighborhood (second domain) PCE address, the above step 101 can also be omitted. After the local PCE obtains or stores multiple neighborhood PCE addresses, an appropriate PCE address is selected among the PCE addresses to establish a PCECP connection to the second domain PCE.

Of course, in the case where the first domain PCE has established a PCECP connection to the second domain PCE, this step 101 can be omitted. Force information query request;

When the PCECP connection is established between the local PCE and the neighboring PCE, the capability information of the neighbor (second domain) PCE can be obtained through the connection. In an application of the present invention, when the local PCE requests inter-domain path calculation, it compares the acquired PCE capability information and selects an appropriate PCE to send an inter-domain path calculation request thereto. In this case, the local PCE also plays the role of the path calculation client, so it is necessary to control the relevant capability information of the PCE in other domains. Of course, the application of the acquisition capability information of the present invention can be various, and is not limited to the application of inter-domain path computation.

In this embodiment, the method for obtaining the capability information of the neighboring PCE includes: sending, by using the established PCECP connection, a PCE Capability Request Message (PCCapReq) to the neighboring PCE, requesting acquisition of a neighboring PCE. Capability information;

In order to implement the capability learning between the PCEs, the existing PCECP protocol may be extended to transmit the capability information to the neighboring PCE by carrying the capability request of the neighboring PCE in the extended PCECP protocol message. The capability information of the neighboring PCE may also be returned by carrying the capability information of the neighboring PCE in the extended PCECP protocol message.

For example, a PCE capability query request message (PCCapReq) and a PCE Capability Response Message (PCCapRsp) message can be added.

The PCCapReq message format is as follows:

[<pce-list>]

The PCCapRsp message format is as follows:

<Capability> [<metric-pce-list>]

Capability is a new object that describes the capability information of the PCE. The format is as follows:

: Capability Object in Extended PCCapRep Message

In Table 1, the IPv4 address is the IP address of the neighboring PCE. This IPv4 address is the neighbor PCE address that needs to query the capability information, and is not necessarily the peer PCE address to establish the connection.

The Cap type is a PCE capability type, such as jurisdiction domain scope, processor capability, supported path computation capability, supported interface exchange granularity, encoding type, support priority, support for maximum message length, support for maximum number of messages, and the like;

The Cap value is a specific description of a certain type of capability.

It should be understood that there may be many methods for actively acquiring the capability information of the neighboring PCE, and is not limited to the manner of carrying the capability request/response of the neighboring PCE in the extended PCECP protocol message, for example, in other protocols. Carry the request or response, or carry it in an existing message, or carry it in a new message.

Step 103: Receive a capability information query result of the returned neighboring PCE, and obtain capability information of the neighboring PCE.

After receiving the capability information query request, the neighbor PCE performs the following operations:

1) determining whether the capability information query request is acceptable;

2) Returning the neighboring PCE capability information by the above newly added response message when it is acceptable. After receiving the query request, the neighbor PCE checks the parameters in the request message, confirms that it is a request sent by the legal PCE, receives and queries the capability information related to the policy according to the requirements in the request, and fills in the capability information obtained by the query. The new response message PCCapRsp is then returned to the PCE of the first domain.

If the neighboring PCE saves other PCE capability information of the same domain (second domain), some or all of the PCE capability information may be returned to the PCE of the first domain through a response message. For example, if the IPv4 address field is set to 0 in the above table 1, it means that all PCE capability information of the same domain is to be queried.

In addition, the local PCE can send a Close message to the neighboring PCE with which the PCECP connection is established. The PCECP connection is closed, and the PCE capability query is completed.

After receiving the response message sent by the neighboring PCE, the local PCE extracts the PCE capability information and can save it in the local database.

In order to ensure the correctness of the neighboring PCE capability information, it may be refreshed periodically, that is, steps 102-103 may be performed periodically, or may be actively notified by the neighboring PCE according to the change of the local capability information.

So far, the flow of the second embodiment of the method for acquiring the inter-domain PCE capability information of the present invention is ended. The following is a brief introduction to the specific application of the PCE capability information obtained by the foregoing implementation manner, for example, using the PCE capability information to perform a path calculation operation, including the following steps:

Step 104: Select a neighboring PCE whose capability information meets the path calculation requirement;

The local PCE calculates the request according to the inter-domain path of the source node, analyzes the capability information of each PCE, and selects the neighboring PCE whose capability meets the requirements. If the neighboring PCE that meets the requirements cannot be obtained, the process ends.

Step 105: Send the path calculation request to the selected neighboring PCE;

After selecting the neighboring PCE whose capability meets the requirements, the inter-domain path calculation request is sent to the selected neighboring PCE.

Step 106: Perform path calculation with the neighboring PCE and return a calculation result.

After the inter-domain path calculation request is sent to the selected neighboring PCE, the selected neighboring PCE calculates a path from the border node to the destination node in the local domain, and returns the path to the local PCE to perform Local PCE collaborative computing operations.

This step can refer to the existing inter-domain path calculation method, which is not mentioned in this article.

In the above embodiment, the distribution or configuration of the PCE address and its associated domain ID is performed only between adjacent domains because the PCE only needs to communicate and negotiate with the adjacent PCE when performing cooperative routing. The local PCE can know which PCEs exist in the adjacent domain and what the address is. Then, based on the local policy, the PCECP protocol selectively establishes a communication connection with the neighboring PCE stored in the local address list, and acquires the capability information thereof, so each PCE can learn the PCE capability information that needs to be known in the adjacent domain. Improve the utilization of network resources and avoid unnecessary network negative caused by flooding and other diffusion methods. Bear.

A person skilled in the art may understand that all or part of the steps of the method for obtaining the inter-domain PCE capability information may be completed by a program to instruct related hardware, and the program may be stored in a computer readable storage medium. In the execution, the program may include the content of each implementation manner of the foregoing method for acquiring inter-domain PCE capability information of the present invention. The storage medium referred to herein is, for example, a ROM/RAM, a magnetic disk, an optical disk, or the like.

Referring to Figure 3, the present invention also provides a first embodiment of a network node PCE, as shown by the local area network node PCE in Figure 3. The PCE includes a capability requesting unit 310, a capability receiving unit 320, and a storage unit 330, wherein in some application embodiments, the storage unit 330 is optional.

The capability requesting unit 310 is configured to send a capability information query request to the neighboring PCE. Specifically, the capability information query request may be sent to the neighboring PCE through the neighbor PCE address. The neighboring PCE address may be provided by the address sending unit 410 of the neighboring PCE, or the neighboring PCE address may be obtained by manually configuring or diffusing through the internal gateway protocol IGP/Border Gateway Protocol BGP, where the local domain is obtained. The step of the PCE to obtain the neighboring PCE address by the IGP/BGP is as follows: the neighboring PCE diffuses its own address information and its own domain identifier through IGP/BGP; the local PCE receives the neighboring PCE. After the address information and the domain identifier of the domain, the neighboring domain PCE and the local PCE are in a neighborhood relationship with each other, and the address information requesting the neighboring PCE is confirmed to be received by the neighboring domain. The first request receiving unit 420 of the domain PCE receives. When the PCECP connection is established between the PCE and the neighboring PCE, the capability information query request can be sent to the neighboring PCE through the connection. When the PCECP connection is not established, a PCECP connection to the neighboring PCE can be established. In order to implement the capability learning between the PCEs, the capability information inquiry request may be sent to the neighboring PCE by carrying the capability request of the neighboring PCE in the extended PCECP protocol message.

The capability receiving unit 320 is configured to receive the neighbor PCE capability information query result requested by the capability requesting unit 310, and obtain the capability information of the neighboring PCE from the result, where the figure is a neighboring PCE. The capability information returned by the capability transmitting unit 430. When the PCECP connection is established between the PCE and the neighboring PCE, the capability sending unit 430 of the neighboring PCE can pass the The connection returns capability information to the capability receiving unit 320 of the PCE. The capability information of the neighbor PCE may be returned by carrying the capability information of the neighbor PCE in the extended PCECP protocol message. Moreover, the capability information of all PCEs in the neighborhood may be returned, or only the capability information of some of the PCEs may be returned.

The storage unit 330 is configured to store the neighbor PCE capability information received by the capability receiving unit 320.

As shown in the first embodiment of the PCE of the present invention, the capability receiving unit 310 actively and selectively queries the capability information of the neighboring PCE, and the capability receiving unit 320 receives the requested PCE capability information to implement accurate acquisition and avoid information flooding. The network congestion caused by the flooding may reduce the amount of information transmission in the network, thereby reducing the network carrying burden; and the neighboring PCE capability information is selectively obtained by the capability requesting unit 310 and the capability receiving unit 320, and then the storage unit 330 is used for storage. The information maintenance of the local PCE is reduced, and the complexity of the PCE selection is reduced. Moreover, because the peer-to-peer acquisition capability information does not spread through the protocol, the inter-domain PCE capability information can be kept confidential.

Corresponding to the present embodiment, an embodiment of the present invention further provides an inter-domain PCE capability sending apparatus, including: a capability request receiving unit, a determining unit, and a capability information sending unit. The capability request receiving unit is configured to receive a capability information query request sent by a neighboring PCE (such as a capability requesting unit), where the determining unit is configured to determine, according to the local policy, whether the capability information query request sent by the neighboring PCE is Accepting, and sending a judgment result; the capability information sending unit, configured to: when receiving the judgment result sent by the determining unit, send feedback to the neighboring PCE (such as a capability receiving unit) that includes the neighborhood PCE The result of the query of the capability information.

In this embodiment, the PCE calculates a network node of the network path in the constraint condition and the network topology, and the network node may be an application or a module, such as a router, a route calculation server, or the like. You can deploy different PCEs in the TE network to manage TE information in their respective domains. Multiple PCEs can also be deployed within the same domain. It is also possible to inject the network topology and TE information into the PCE according to the route calculation needs, and to uniformly undertake the route calculation task.

Referring also to FIG. 3, the present invention also provides a second embodiment of the PCE, as shown by the neighboring network node PCE in FIG. The PCE includes an address transmitting unit 410, a first request receiving unit 420, and a capability transmitting unit 430. The address sending unit 410 is configured to send a local address to provide to the alien PCE. Specifically, the local address is only spread to the domain where the foreign PCE is located by using the IGP/BGP protocol, and the foreign PCE is obtained by the foreign PCE. In the figure, the local address is sent to the capability request unit 310.

The first request receiving unit 420 is configured to receive a capability information query request sent by the foreign PCE. In this embodiment, the first request receiving unit 420 is configured to receive the capability information query request sent by the capability requesting unit 310 of the foreign PCE.

The capability sending unit 430 is configured to send the capability information of the local PCE to the foreign PCE after the first request receiving unit 420 receives the capability information query request. In this embodiment, the PCE capability information may be returned by carrying the capability information of the foreign PCE in the extended PCECP protocol message. In the figure, it is returned to the capability receiving unit 320 in the local area network node.

The PCE further includes a determining unit (not shown), configured to determine, according to the local policy, whether the capability information query request sent by the neighboring PCE is acceptable, and send the determination result; the capability information sending unit 430, And after receiving the determination result that the determining unit sends the acceptance, sending, to the neighboring PCE (such as the capability receiving unit), a query result including the capability information of the neighboring PCE, that is, receiving according to the first request receiving unit. And sending, by the capability information query request, capability information of the at least one PCE of the network domain where the PCE is located to the foreign PCE.

The present embodiment can cooperate with the capability information query request of the foreign PCE, and send local capability information to the foreign PCE to implement point-to-point capability acquisition and reduce network load.

Referring to the local network node PCE of FIG. 4, based on the implementation manner shown in FIG. 3, the local PCE may further include:

The address obtaining unit 340 is configured to obtain the neighboring PCE address by using the manual configuration, or obtain the neighboring PCE address that is diffused by the IGP/BGP protocol, for example, obtain the neighboring PCE sent by the address sending unit 410 of the neighboring PCE. address.

In this embodiment, the local PCE may further include:

The first connection establishing unit 350 is configured to send a connection establishment request to the second request receiving unit 440 of the neighbor PCE according to the neighbor PCE address obtained by the address obtaining unit 340, and then establish a second connection with the neighbor PCE. Unit 450 is coupled to establish a PCECP connection to the neighborhood PCE. When there is no PCECP connection between the PCE and the neighboring PCE, the first connection establishing unit 350 may establish a connection for carrying the capability information query request output by the capability requesting unit 310.

In this embodiment, the local PCE may further include:

The PCE selection unit 360 is configured to select a second PCE whose capability information meets the path calculation requirement by analyzing at least one PCE capability information of the neighborhood in the storage unit 330, and send a path calculation to the selected second PCE. Request, thus implementing path calculation.

Referring to the neighboring network node PCE of FIG. 4, in the embodiment of the embodiment shown in FIG. 3, the neighboring PCE may further include:

The second request receiving unit 440 is configured to receive a connection establishment request of the foreign PCE. In the figure, it is a connection establishment request transmitted by the first connection establishing unit 350.

a second connection establishing unit 450, configured to establish a connection to the foreign PCE after the second request receiving unit 440 receives the connection establishment request, for the first request receiving unit 420 and the capability sending unit The 430 receives the request and transmission capability information, respectively. In the figure, the second connection establishing unit 450 and the first connection establishing unit 350 together establish a connection between two PCEs.

In this embodiment, the address sending unit 410 may send a local address to the neighboring PCE, or may send the local address to the non-neighboring alien PCE.

In this embodiment, the method further includes: a path calculation unit 440, configured to calculate a path in the destination PCE of the local domain PCE to the foreign domain after receiving the path calculation request sent by the foreign PCE (such as the PCE selection unit 360) And feed back the calculation results to the alien PCE (such as PCE selection unit 360).

Referring to FIG. 5, the present invention further provides a PCE capability acquisition device, where the PCE capability acquisition device includes a capability requesting unit 310 and a capability receiving unit 320.

The capability requesting unit 310 is configured to send a capability information query request to the neighboring PCE. The capability receiving unit 320 is configured to receive the neighbor PCE feedback capability information query result, and obtain capability information of the neighbor PCE. The capability acquisition device can be set in the PCE of the TE network to implement peer-to-peer acquisition of PCE capability information and reduce network load.

In this embodiment, the capability acquiring apparatus may further include:

a first connection establishing unit 350, configured to establish, according to the neighbor PCE address obtained by the PCE determining unit, a PCECP connection to the neighboring PCE, where the connection is used to carry the capability requesting unit 310 output capability information query request.

In this embodiment, the capability acquiring apparatus may further include:

The PCE determining unit 370 is configured to determine, according to the local policy and the interaction requirement with the neighboring PCE, a PCE address used for establishing a connection with the PCE of the neighborhood in the PCE addresses of the multiple neighborhoods, and input to the first connection establishment. Unit 350.

It should be noted that the capability requesting unit 310, the capability receiving unit 320, the storage unit 330, the first connection establishing unit 350, the address obtaining unit 340, and the PCE selecting unit 360 in the first embodiment of the foregoing network node PCE of the present invention may be integrated in In a processing module, the second embodiment of the foregoing network node PCE of the present invention, the units in the capability acquiring device may also be integrated into one processing module; or any two or two of the foregoing embodiments. More than one can be integrated into one processing module.

In the embodiment, a communication system is further provided, where the communication system includes: having at least one

a first network domain of the PCE and a second network domain having at least one PCE,

The first PCE saves the obtained capability information of at least one PCE of the second network domain. The communication system further includes:

Obtaining, by the first PCE, a PCE address of the second PCE, establishing a PCECP connection to the second PCE according to the PCE address, where the PCECP connection is used to carry a capability information query request and/or the second network Capability information for at least one PCE of the domain.

It is also worth noting that, in practical applications, the first embodiment and the second embodiment of the network node PCE of the present invention can be integrated into one PCE and used as scenes of the local domain PCE and the neighborhood/external domain PCE, respectively.

It should also be noted that the units in the PCE and the capability acquisition device embodiments of the present invention may be implemented in the form of hardware, and the software-implemented portions may also be implemented in the form of software function modules. Accordingly, the embodiments of the PCE and the capability acquisition device of the present invention can be sold or used as separate products, and the software-implemented portion can also be stored in a computer readable storage medium. Sales or use.

It should be noted that the local PCE in the foregoing method, apparatus, or device refers to the first PCE of the first network domain; the neighbor PCE refers to the second PCE of the second network domain or the first PCE of the neighboring domain; The capability information of the neighborhood PCE is capability information of at least one PCE of the neighborhood.

In summary, the present invention can at least produce the following technical effects:

1. Improve network usage efficiency and reduce network burden;

2. Reduce the burden of information maintenance on the PCE locality and reduce the complexity of PCE selection;

3. Realize confidentiality of inter-domain PCE capability information.

The method for acquiring the PCE capability information of the inter-domain network node, the PCE and the capability acquisition device provided by the present invention are described in detail by using specific embodiments. The description of the above embodiments is only for helping to understand the method and the idea of the present invention. At the same time, the content of the present invention is not limited by the scope of the present invention.

Claims

Rights request

A method for acquiring PCE capability information of an inter-domain network node, comprising: transmitting, by a first PCE of the first network domain, a capability information query request to a second PCE of the second network domain; the first PCE receiving The capability information query result returned by the second PCE obtains capability information of at least one PCE of the second network domain;

The first PCE saves the obtained capability information of at least one PCE of the second network domain.

2. The method according to claim 1, wherein the first PCE obtains a PCE address of the second PCE, and sends a capability information query request to the second PCE by using the obtained PCE address, the PCE The address is obtained by manual configuration or by the internal gateway protocol IGP/Border Gateway Protocol BGP.

The method according to claim 2, wherein the PCE address is diffused by IGP/BGP to include:

Receiving, by the first PCE, the IGP/BGP protocol message that includes the address information of the PCE that is diffused by the second PCE, obtaining the address information of the PCE from the IGP/BGP protocol message, or the first PCE receiving station The IGMP/BGP protocol message including the address information of the PCE spread by the network management system NMS is obtained, and the address information of the PCE is obtained from the IGP/BGP protocol message.

The method according to claim 2, wherein the method further comprises: establishing a path calculation unit communication protocol PCECP connection to the second PCE according to the PCE address information;

The sending, by the first PCE, the capability information query request to the second PCE is specifically:

The first PCE sends a PCE capability information query request to the second PCE using the established PCECP connection.

5. The method according to claim 1, wherein the process of the path calculation operation comprises:

The first PCE selects, according to the saved capability information of the at least one PCE of the second network domain, a PCE of the second network domain that meets a path calculation requirement;

The first PCE sends a path calculation request to the selected PCE;

The first PCE receives a calculation result returned by the selected PCE, and the calculation result includes a path from the boundary PCE of the second network domain to the destination PCE of the first network domain.

6. A PCE, wherein the PCE comprises:

And a storage unit, configured to store capability information of the at least one PCE of the neighborhood received by the capability receiving unit.

The PCE according to claim 6, wherein the PCE further comprises:

And a PCE selection unit, configured to select a second PCE whose capability information meets the path calculation requirement by analyzing capability information of the at least one PCE of the neighborhood in the storage unit, and send a path calculation request to the selected second PCE.

The PCE according to claim 7, wherein the PCE further includes an address obtaining unit of the unit for obtaining a PCE address of the first PCE of the neighborhood, wherein the PCE address is manually Configuring or spreading BGP through the Interior Gateway Protocol IGP/Border Gateway Protocol

The PCE determining unit is configured to determine, according to the local policy and the interaction requirement with the first PCE of the neighborhood, a PCE address used for establishing a connection with the first PCE of the neighborhood in the multiple PCE addresses of the neighborhood.

The PCE according to claim 8, further comprising:

a first connection establishing unit, configured to establish, according to the PCE address of the first PCE of the neighborhood obtained by the address obtaining unit or the PCE determining unit, a PCECP connection to the first PCE of the neighborhood, where the connection is used for A capability information query request that is output by the capability requesting unit.

10. A PCE, comprising:

The PCE according to claim 10, further comprising:

a second request receiving unit, configured to receive a connection establishment request from the foreign PCE, where the second connection establishing unit is configured to establish, after the second request receiving unit receives the connection establishment request, the foreign PCE Connection, wherein the connection is used to carry the capability of the foreign PCE The information query request and capability information for carrying at least one PCE of the network domain where the PCE is located.

The PCE according to claim 10, wherein the address sending unit spreads the local address to the domain where the foreign PCE is located by using the IGP/BGP protocol.

The PCE according to claim 10, further comprising: an address sending unit, configured to send a local address of the PCE to be provided to the foreign PCE.

The PCE according to claim 10, further comprising:

a determining unit, configured to determine, according to the local policy, whether the capability information query request sent by the foreign PCE is acceptable, and send the determination result to the capability sending unit;

a capability sending unit, configured to: when receiving the determination result that the determining unit sends the acceptance, according to the first request receiving unit, receiving the capability information query request, sending capability information of at least one PCE of the network domain where the PCE is located Give the foreign PCE.

15. A communication system, the communication system comprising: a first network domain having at least one PCE and a second network domain having at least one PCE,

The communication system according to claim 15, further comprising: