CN108023810A - The notifying method and device of concatenation ability - Google Patents

Abstract

The present invention provides a connection capability notification method and device, wherein the method includes: creating a path computation element protocol PCEP message at the path computation client PCC, wherein the PCEP message carries a Attribute information of the multi-connection capability; during the PCEP session phase between the PCC and the path computation unit PCE, the PCEP message is notified to one or more of the PCEs. The invention solves the problem in the related art that the PCC cannot establish multiple PCEP session connections with multiple PCEs.

Description

Notification method and device of connection capability

technical field

The present invention relates to the communication field, in particular, to a connection capability notification method and device.

Background technique

A Path Computation Element (PCE) is an entity, component, application or network node that can calculate a network path or route based on a network graph and apply calculation constraints. A Path Computation Client (PCC) is a client application that requests path computations to be performed by the PCE. RFC4655 describes a PCE-based structure for Multiprotocol Label Switching (Multiprotocol LabelSwitching, MPLS) and Generalized Multiprotocol Label Switching (Generalized Multiprotocol LabelSwitching, GMPLS) Traffic Engineer (Traffic Engineer, TE) Label Switched Paths (Label Switched Paths) , LSP) path computation.

The PCE and the PCC use the Path Computation Element Protocol (Path Computation Element Protocol, PCEP) as the communication protocol [RFC 5440]. The PCC requests a path or route from the PCE through the PCEP protocol, and the PCE forwards the calculated path information to the PCC.

RFC 4655 defines that the PCEP protocol is based on the Transmission Control Protocol (Transmission Control Protocol, referred to as TCP) to establish a session (session), port number 4189, and stipulates that each PCC can only establish a PCEP session (session) with one PCE at any time. Only one TCP connection can be established per PCEP peer at any time. This protocol design does not cause problems when PCEP is used for traffic engineering of MPLS and GMPLS networks, because the network state synchronization information and path establishment information between PCE and PCC are not too large. However, with the software-defined network SDN technology proposed, when the PCEP protocol is used for the southbound interface protocol between the PCE and the PCC, the data transmission between the PCC and the PCE will increase greatly, especially the user traffic between the PCE and the PCC. Data collection and real-time reporting, when network bandwidth and paths need to be dynamically established and adjusted, the reliability between PCE and PCC needs to be considered. If there is a connection interruption or failure between PCE and PCC, then the service path cannot be guaranteed. Adjust and build dynamically.

Aiming at the above-mentioned problems existing in related technologies, no effective solution has been found yet.

Contents of the invention

Embodiments of the present invention provide a connection capability notification method and device to at least solve the problem in the related art that a PCC cannot establish multiple PCEP session connections with multiple PCEs.

According to an embodiment of the present invention, a method for announcing a connection capability is provided, including: creating a path computation element protocol PCEP message at a path computation client PCC, wherein the PCEP message carries an Attribute information of the multi-connection capability; during the PCEP session phase between the PCC and the path computation unit PCE, the PCEP message is notified to one or more of the PCEs.

Optionally, after the PCEP message is notified to one or more of the PCEs, the method further includes: receiving a role request message of the PCE, wherein the role request message carries the priority of the PCE assigning a PCE role to the PCE according to the priority attribute.

Optionally, assigning a PCE role to the PCE according to the priority attribute includes: comparing the priority attribute of the PCE with the priority attribute of the main PCE of the current connection; When the priority attribute of the master PCE is assigned, the PCE role of the PCE is assigned as the master PCE.

Optionally, the PCE roles include: a master PCE, a slave PCE, a parent PCE, and a child PCE.

Optionally, after the PCEP message is notified to one or more of the PCEs, the method includes: determining that a session interruption between PCEs of the PCC is interrupted; determining the master PCE according to a preset priority election; The master PCE sends a role request message, and switches the connection with the PCE to the master PCE.

Optionally, determining that the session interruption between the PCEs of the PCC includes at least one of the following: when the PCC receives the close message of the PCE, determining that the session interruption between the PCEs of the PCC; When the PCC does not receive the keep-alive message of the PCE within a predetermined time interval, it determines that the session between the PCEs of the PCC is interrupted; when it detects that the transmission control protocol TCP connection between the PCC and the PCE fails , it is determined that the session between the PCEs of the PCC is interrupted.

Optionally, after the master PCE is determined according to the preset priority election, the method further includes: determining a slave PCE according to the preset priority election; and sending a role request message to the slave PCE.

Optionally, the attribute information includes: an identification field carried in the Open message.

According to another embodiment of the present invention, a device for announcing a connection capability is provided, including: a creating module, configured to create a Path Computation Element Protocol (PCEP) packet at a path computation client PCC, wherein the PCEP packet carries a The attribute information representing the multi-connection capability of the PCC; the notification module is configured to notify the PCEP message to one or more of the PCEs during the PCEP session phase between the PCC and the PCE.

Optionally, the device further includes: a receiving module, configured to receive a role request message of the PCE after the notification module notifies the PCEP message to one or more of the PCEs, wherein the The role request message carries the priority attribute of the PCE; the allocation module is configured to assign a PCE role to the PCE according to the priority attribute.

Optionally, the allocation module includes: a comparison unit, configured to compare the priority attribute of the PCE with the priority attribute of the currently connected master PCE; a determination unit, configured to determine when the priority attribute of the PCE is higher than the current When the priority attribute of the connected master PCE is used, the PCE role of the PCE is assigned as the master PCE.

Optionally, the PCE roles include: a master PCE, a slave PCE, a parent PCE, and a child PCE.

Optionally, the device includes: a determining module, configured to determine that the session interruption between PCEs of the PCC is interrupted after the notification module notifies the PCEP message to one or more of the PCEs; An election module, configured to elect and determine a master PCE according to a preset priority; a processing module, configured to send a role request message to the master PCE, and switch the connection with the PCE to the master PCE.

Optionally, the determining module determining that the session interruption between the PCEs of the PCC includes at least one of the following: when the PCC receives the closing message of the PCE, determining that the session interruption between the PCEs of the PCC ; When the PCC does not receive the keep-alive message of the PCE within a predetermined time interval, it is determined that the session between the PCEs of the PCC is interrupted; when the transmission control protocol between the PCC and the PCE is detected When the TCP connection fails, it is determined that the session between the PCEs of the PCC is interrupted.

Optionally, the device further includes: a second election module, configured to elect and determine a slave PCE according to the preset priority after the first election module elects to determine the master PCE according to the preset priority; the sending module, It is used to send a role request message to the secondary PCE.

Optionally, the attribute information includes: an identification field carried in the Open message.

According to still another embodiment of the present invention, a storage medium is also provided. The storage medium is configured to store program code for performing the following steps:

Create a path computation unit protocol PCEP message at the path computation client PCC, wherein the PCEP message carries attribute information for representing that the PCC has multi-connection capability;

In the PCEP session phase between the PCC and the PCE, the PCEP message is notified to one or more of the PCEs.

Through the present invention, a path computation unit protocol PCEP message is created at the path computation client PCC, wherein the PCEP message carries attribute information for characterizing that the PCC has multi-connection capability; between the PCC and the path computation unit PCE In the PCEP session stage, the PCEP message is notified to one or more of the PCEs, and multiple PCEP session connections are established between the PCC and multiple PCEs by creating a PCEP message with multi-connection capability and notifying the PCE , can realize switching of PCE connections, guarantee service continuity, and solve the problem in the related art that the PCC cannot establish multiple PCEP session connections with multiple PCEs.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a flowchart of a method for announcing a connection capability according to an embodiment of the present invention;

FIG. 2 is a structural block diagram of an apparatus for notifying connection capabilities according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the PCE overall functional architecture of the present embodiment;

Fig. 4 is a multi-PCE connection network diagram of the present embodiment;

Fig. 5 is a format diagram of the Open object of the Open message of the present embodiment;

Fig. 6 is a MULTIPLE-PCE-CAPABILITY-TLV format diagram of the present embodiment;

FIG. 7 is a PCE-ROLE-TLV format diagram of this embodiment;

Fig. 8 is the initialization flowchart of the multiple PCE connection of this embodiment;

FIG. 9 is a flow chart of PCE handover initiated by the PCC in this embodiment;

FIG. 10 is a flow chart of the PCE handover initiated by the PCE in this embodiment;

FIG. 11 is a flow chart of PCE switching in the hierarchical PCE scenario of this embodiment.

Detailed ways

Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence.

Example 1

In this embodiment, a method for notifying a connection capability is provided. FIG. 1 is a flowchart of a method for notifying a connection capability according to an embodiment of the present invention. As shown in FIG. 1 , the process includes the following steps:

Step S102, creating a path computation unit protocol PCEP message at the path computation client PCC, wherein the PCEP message carries attribute information for indicating that the PCC has multi-connection capability;

In step S104, during the PCEP session phase between the PCC and the PCE, the PCEP message is notified to one or more PCEs.

Through the above steps, the path computation client PCC creates a path computation unit protocol PCEP message, wherein, the PCEP message carries attribute information used to indicate that the PCC has multi-connection capability; during the PCEP session phase between the PCC and the path computation unit PCE, the The PCEP message is notified to one or more PCEs. By creating a PCEP message with multi-connection capability and notifying the PCE, multiple PCEP session connections can be established between the PCC and multiple PCEs, which can realize the switching of PCE connections and ensure business continuity, which solves the problem in the related art that the PCC cannot establish multiple PCEP session connections with multiple PCEs.

Optionally, the execution subject of the above steps may be the PCC, the control terminal of the PCC, etc., but is not limited thereto.

Optionally, the attribute information includes: an identification field carried in the Open message.

Optionally, after the PCEP message is notified to one or more PCEs, multiple PCEP session connections are established between the PCC and multiple PCEs. When a connection fails, it can be quickly switched to another connection to ensure Continuity of business. It can be active switching and passive switching.

In the scheme of passive switching, the method also includes:

S11. Receive a role request message from the PCE, where the role request message carries the priority attribute of the PCE;

S12. Allocate a PCE role to the PCE according to the priority attribute.

Optionally, assigning the PCE role to the PCE according to the priority attribute includes: comparing the priority attribute of the PCE with the priority attribute of the currently connected master PCE; the priority attribute of the PCE is higher than the priority attribute of the currently connected master PCE , assign the PCE role of the PCE as the master PCE. The priority attribute is pre-configured on the PCE side, and the PCC can obtain the priority attribute of the connected PCE.

In this embodiment, the PCE roles include: a master PCE, a slave PCE; a parent PCE, and a child PCE.

In an active handover scenario, methods include:

S21, determine the session interruption between the PCEs of the PCC;

S22, determine the primary PCE according to preset priority election;

S23. Send a role request message to the master PCE, and switch the connection with the PCE to the master PCE.

Optionally, after the master PCE is determined according to the preset priority election, the method further includes: determining the slave PCE according to the preset priority election; and sending a role request message to the slave PCE.

In this embodiment, it is determined that the session interruption between the PCEs of the PCC is triggered by the following scenarios: when the PCC receives the shutdown message of the PCE, it is determined that the session interruption between the PCEs of the PCC is not received within a predetermined time interval; When a keep-alive message from the PCE is received, it is determined that the session between the PCEs of the PCC is interrupted; when a fault is detected in the transmission control protocol TCP connection between the PCC and the PCE, it is determined that the session between the PCEs of the PCC is interrupted.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products are stored in a storage medium (such as ROM/RAM, disk, CD) contains several instructions to enable a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

Example 2

In this embodiment, a device for notifying connection capabilities is also provided, which is used to implement the above embodiments and preferred implementation modes, and what has already been described will not be repeated. As used below, the term "module" may be a combination of software and/or hardware that realizes a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.

Fig. 2 is a structural block diagram of a connection capability notification device according to an embodiment of the present invention. As shown in Fig. 2, the device includes:

The creation module 20 is used to create a PCEP message of the path calculation element protocol at the path calculation client PCC, wherein the PCEP message carries attribute information for indicating that the PCC has multi-connection capabilities;

The notification module 22 is configured to notify the PCEP message to one or more PCEs during the PCEP session phase between the PCC and the PCE.

Optionally, the attribute information includes: an identification field carried in the Open message.

In an optional implementation manner according to this embodiment, the device further includes: a receiving module, configured to receive a role request message of a PCE after the notification module notifies the PCEP message to one or more PCEs, wherein the role request message carries The priority attribute of the PCE; an allocation module, configured to assign a PCE role to the PCE according to the priority attribute.

Optionally, the allocation module includes: a comparison unit, used to compare the priority attribute of the PCE with the priority attribute of the currently connected main PCE; When the level attribute is specified, the PCE role of the PCE is assigned as the primary PCE.

The PCE roles in this embodiment include: a master PCE, a slave PCE; a parent PCE, and a child PCE.

In an optional implementation manner according to this embodiment, the device includes: a determining module, configured to determine that the session interruption between PCEs of the PCC is interrupted after the notification module notifies the PCEP message to one or more PCEs; the first election module , used to elect and determine the main PCE according to the preset priority; the processing module is used to send a role request message to the main PCE, and switch the connection with the PCE to the main PCE.

Optionally, the determining module determines that the session interruption between the PCEs of the PCC includes at least one of the following: when the PCC receives the closing message of the PCE, it determines that the session interruption between the PCEs of the PCC; When a keep-alive message from the PCE is received, it is determined that the session between the PCEs of the PCC is interrupted; when a fault is detected in the transmission control protocol TCP connection between the PCC and the PCE, it is determined that the session between the PCEs of the PCC is interrupted.

Optionally, the device further includes: a second election module, configured to elect and determine a slave PCE according to a preset priority after the first election module elects to determine a master PCE according to a preset priority; a sending module, configured to send a message to the slave PCE Role request message.

It should be noted that the above-mentioned modules can be realized by software or hardware. For the latter, it can be realized by the following methods, but not limited to this: the above-mentioned modules are all located in the same processor; or, the above-mentioned modules can be combined in any combination The forms of are located in different processors.

Example 3

This embodiment is an optional embodiment according to the present invention, and is used to describe this application in detail in combination with specific scenarios:

This embodiment proposes a method for realizing PCEP multi-PCE control and connection. PCC establishes multiple PCEP session connections with multiple PCEs. When a connection fails, it can be quickly switched to another connection to ensure Continuity of business.

The method for realizing the multi-PCE connection of the PCEP protocol of the present embodiment includes: extending the PCEP protocol message to announce multi-PCE connection capability attribute information or role information, and the role information of the PCE includes master PCE (main PCE) and slave PCE (slave PCE) The multi-connection ability attribute information of the extended PCEP protocol includes the identification field that carries the multi-connection ability attribute in the Open message of the extended PCEP agreement; , PCE role request) message carries the role information of the PCE, and the PCrq message is sent by the PCE to the PCC to request its own role change. The extended PCEP protocol notification of PCE role information also includes the extended PCEP protocol newly added PCE Role Reply (PCRrp) message carrying the role information of the PCE, and the PCRrp message is sent by the PCC to the PCE to notify the current Master PCE.

FIG. 3 is a schematic diagram of the overall functional architecture of the PCE in this embodiment. The PCE is connected to a network management system (Network Management System, referred to as NMS), a plurality of nodes, and PCEs of other domain networks, including: Traffic Engineering Database (Traffic Engineering Database, referred to as NMS for short) TED), path calculation module, PCE communication module, etc. FIG. 4 is a multi-PCE connection network diagram of this embodiment, and the content of the specific implementation manner of the present invention will be described below as shown in FIG. 4 .

In FIG. 4, the path computation client PCC establishes PCEP sessions with multiple path computation elements PCE1, PCE2, and PCE3. Among them, PCE1 is the master (master) role, and PCE2 and PCE3 are slave (slave) roles. When the TCP connection or PCEP session between the PCC and PCE1 fails, the PCC selects PCE2 or PCE3 as the master, and the PCEP session is switched between the new master PCE and the PCC.

The method for multi-PCE connection of the present embodiment needs to expand the function of existing PCEP agreement to have:

Capability advertisement (E-C, C-E): PCC and PCE need to advertise the ability to have multiple PCE connections during the PCEP session phase

Role Request (Role Request) (E-C): The PCE sends a role request message to the PCC, and when the PCC receives the PCE's role request message, it selects the master PCE according to the parameters in the message.

Role Reply (C-E): The PCC sends a role response message to the PCE to notify the current MasterPCE.

FIG. 5 is a format diagram of the Open object of the Open message in this embodiment. The Open object is encapsulated in the Open message and sent between the PCC and the PCE by the Open message. The Ver field in the Open object is the version number of PCEP, the Flag field is the identification bit, the Keepalive field is the interval time for sending Keepalive messages from the PCEP peer, in seconds, and the Deadtimer field is the expiration time of the PCEP session, that is, when the Deadtimer is exceeded If the keepalive message from the peer is not received within a certain period of time, it is considered that the peer is faulty, and the PCEP session needs to be terminated. The SID field (PCEP session ID) is the identification number of the PCEP session. Optional TVLs are TLVs that may be carried in the Open object.

The capability announcement of the PCEP multi-PCE connection in this embodiment is carried in the optional TLV of the Open object by adding the MULTIPLE-PCE-CAPABILITY TLV through extension. The format definition of MULTIPLE-PCE-CAPABILITY of the present invention is as shown in Figure 6, and Figure 6 is the MULTIPLE-PCE-CAPABILITY-TLV format figure of this embodiment, and the description of each field is as follows:

The Type field indicates that this TLV is MULTIPLE-PCE-CAPABILITY TLV;

The Length field is the length of this TLV;

The Flag field is an identifier that may be used by this TLV, and currently no identifier is defined.

The Priority field is the priority of the master PCE election. When the PCE sends the Open message to the PCC, it carries the priority of the PCE. In the Open message sent by the PCC, this field is filled with 0.

The format of the role request message of the present invention is as follows:

<PCRrq Message>::=<Common Header>

<Role>

The PCRrq message only includes the Role object, and the Role object includes the PCE-ROLE-TLV. FIG. 7 is a PCE-ROLE-TLV format diagram of this embodiment. As shown in FIG. 7, the role request message is sent from the PCE device to the PCC device.

The format of the role response message of the present invention is as follows:

<PCRrp Message>::=<Common Header>

<Role>

The PCRrp message also only includes the Role object, where the Role object includes the PCE-ROLE-TLV. The role response message is sent by the PCC to the PCE.

The PCE-ROLE-TLV format of the present invention is as shown in Figure 7, and the definition of field is as follows:

The Type field identifies this TLV as PCE-ROLE-TLV;

The Length field is the length of this TLV;

The PCE-ROLE field is the role of the PCE, which can be master or slave.

The Priority field is the master PCE election priority. When PCE-ROLE-TLV is carried in PCRrp and sent from PCC to PCE, this field is filled with the priority value of the current Master PCE; when PCE-ROLE-TLV is carried in PCRrq and sent from PCE to PCC, this field Filled with the priority value of this PCE.

The master-PCE-ID field is the router id of the master PCE, with a length of 32 bits. When PCE-ROLE-TLV is encapsulated in PCRrp message and sent from PCE to PCC, the value of this field is filled with the router ID of the PCE; when PCE-ROLE-TLV is encapsulated in PCRrp message and sent from PCC to PCE, the value of this field The value is filled with the router ID of the master PCE.

Specific embodiment one:

FIG. 8 is a flow chart of initialization of a multi-PCE connection in this embodiment, illustrating the initialization process of a multi-PCE connection in the present invention.

In FIG. 8 , PCC expects to establish PCEP sessions with PCE1 and PCE2 respectively, and PCE1 , PCE2 and PCC all need to announce in the Open message that they have the capability of multi-PCE connection. The initialization process with multiple PCE connections is as follows:

(1) PCC sends an Open message to PCE1, carrying the MULTIPLE-PCE-CAPABILITY TLV proposed by the present invention in the message, and announcing that the PCC has the ability to connect multiple PCEs;

(2) PCE1 also sends Open message to PCC, also carries the MULTIPLE-PCE-CAPABILITY TLV that the present invention proposes in the message, announces that PCE1 also has the ability of multi-PCE connection;

(3) Similarly, PCC and PCE2 also send Open messages carrying MULTIPLE-PCE-CAPABILITY TLV to each other, announcing that they have the ability to connect to multiple PCEs;

(4) After PCC receives the Open message of PCE1, it sends a keepalive message according to the time interval defined in the keepalive (keep alive) field in the Open message to keep alive the session of PCEP;

(5) After receiving the Open message from the PCC, PCE1 will also send a keepalive message at the time interval defined by the keepalive field in the Open message to keep the PCEP session alive.

(6) A keepalive message is similarly sent between PCC and PCE2 to keep the session alive.

Specific embodiment two:

FIG. 9 is a flow chart of PCE switching initiated by the PCC in this embodiment, illustrating the flow of PCE switching initiated by the PCC using the content of the present invention.

In Fig. 9, the PCC establishes a PCEP session with PCE1, PCE2, and PCE3, wherein PCE1 is the master PCE, and PCE2 and PCE3 are slave PCEs.

The following describes the process of switching the Master PCE to PCE2 when the session between the PCE1 and the PCC is interrupted.

(1) When the PCC receives the close message from PCE1, it needs to close the PCEP session between the PCC and PCE1, or the PCC does not receive the keepalive message from PCE1 within the Deadtimer interval, or the PCC detects a TCP connection with PCE1 When the connection fails, the PCC closes the PCEP session with PCE1 and starts the process of reselecting the Master PCE;

(2) The PCC elects a new master PCE according to the priority, assuming that PCE2 is elected as the masterPCE according to the priority;

(3) PCC sends a PCRrp message to PCE2, and the PCRrp message carries PCE-ROLE-TLV information. In this TLV, the value of the PCE-Role field is master, and the master-PCE-ID is the router ID of PCE2;

(4) PCC will also send a PCRrp message to PCE3, and the PCRrp message also carries PCE-ROLE-TLV information, wherein the value of the PCE-Role field is slave, and the value of master-PCE-ID is the router ID of PCE2;

The primary master of PCC is switched from PCE1 to PCE2.

Specific embodiment three:

FIG. 10 is a flow chart of the PCE handover initiated by the PCE in this embodiment. The embodiment of the present invention describes the PCE handover process initiated by the PCE by using the content of the present invention in conjunction with FIG. 10 .

The PCC establishes a PCEP session with PCE1, PCE2, and PCE3, where PCE1 is the master PCE, and PCE2 and PCE3 are slave PCEs. PCE2 hopes to replace PCE1 as the master PCE.

The following describes the switching process of the master PCE:

(1) PCE2 sends a PCRrq message to PCC, and the PCRrq message carries PCE-ROLE-TLV, wherein the PCE-role field is master, the priority is the priority of PCE2, and the master-PCE-ID is the router ID of PCE2;

(2) After the PCC receives the PCE's PCRrq message requesting to change the Role, it compares the priorities of PCE2 and the current Master PCE. If it finds that the priority of PCE2 is higher than that of the current master PCE, the PCC switches the current masterPCE to PCE2, and sends a PCRrp message to the PCE to notify the master PCE that it has changed;

(3) PCC sends a PCRrp message to PCE1, wherein the PCE-Role message is slave, the priority field is the priority of PCE2, and the master-PCE-ID is the router ID of PCE2;

(4) PCC also sends a PCRrp message to PCE2, wherein the PCE-Role message is master, the priority field is the priority of PCE2, and the master-PCE-ID is the router ID of PCE2;

(5) The PCC sends a PCRrp message to PCE3, wherein the PCE-Role message is slave, the priority field is the priority of PCE2, and the master-PCE-ID is the router ID of PCE2.

Specific embodiment four

FIG. 11 is a flow chart of PCE switching in a hierarchical PCE scenario in this embodiment. The embodiment of the present invention describes a method for PCE switching in a hierarchical PCE scenario using the content of the present invention in conjunction with FIG. 11 .

In Fig. 11, PCE1, PCE2, and PCE3 are child PCEs, which are managed and controlled by the parent PCE, PCE1 is the master PC, and PCE2 and PCE3 are slave PCEs. In the hierarchical PCE, only the master PCE needs to notify the parent PCE of link state data, and other slave PCEs only need to synchronize the state with the master PCE. When the master PCE is switched from PCE1 to PCE2 (whether initiated by the PCE or by the PCC), PCE2 replaces PCE1 to notify the parent PCE of link state data.

Example 4

The embodiment of the invention also provides a storage medium. Optionally, in this embodiment, the above-mentioned storage medium may be configured to store program codes for performing the following steps:

S1. Create a Path Computation Element Protocol PCEP message at the path calculation client PCC, where the PCEP message carries attribute information for indicating that the PCC has a multi-connection capability;

S2. Notifying one or more of the PCEs of the PCEP packet during the PCEP session phase between the PCC and the PCE.

Optionally, in this embodiment, the above-mentioned storage medium may include but not limited to: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk Various media that can store program codes such as discs or optical discs.

Optionally, in this embodiment, the processor executes, according to the program code stored in the storage medium, to create a path computation unit protocol PCEP packet at the path computation client PCC, where the PCEP packet carries a Attribute information of PCC with multi-connection capability;

Optionally, in this embodiment, the processor executes the PCEP session phase between the PCC and the path computation element PCE according to the program code stored in the storage medium, and notifies the PCEP message to one or more of the PCE.

Optionally, for specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments and optional implementation manners, and details are not repeated in this embodiment.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned present invention can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network formed by multiple computing devices Alternatively, they may be implemented in program code executable by a computing device so that they may be stored in a storage device to be executed by a computing device, and in some cases in an order different from that shown here The steps shown or described are carried out, or they are separately fabricated into individual integrated circuit modules, or multiple modules or steps among them are fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (16)

1. A method for announcing a connection capability, comprising: Create a path computation unit protocol PCEP message at the path computation client PCC, wherein the PCEP message carries attribute information for representing that the PCC has multi-connection capability; In the PCEP session phase between the PCC and the PCE, the PCEP message is notified to one or more of the PCEs. 2. The method according to claim 1, characterized in that, after the PCEP message is notified to one or more of the PCEs, the method further comprises: receiving the role request message of the PCE, where the role request message carries the priority attribute of the PCE; Allocating a PCE role to the PCE according to the priority attribute. 3. The method according to claim 2, wherein assigning a PCE role to the PCE according to the priority attribute comprises: Comparing the priority attribute of the PCE with the priority attribute of the currently connected main PCE; When the priority attribute of the PCE is higher than the priority attribute of the currently connected primary PCE, assign the PCE role of the PCE to the primary PCE. 4. The method according to claim 2, wherein the PCE roles include: a master PCE, a slave PCE, a parent PCE, and a child PCE. 5. The method according to claim 1, characterized in that, after the PCEP message is notified to one or more of the PCEs, the method comprises: determining a session interruption between PCEs of the PCC; Determine the main PCE according to the preset priority election; Sending a role request message to the master PCE, and switching the connection with the PCE to the master PCE. 6. The method according to claim 5, wherein determining that the session interruption between the PCEs of the PCC comprises at least one of the following: When the PCC receives the close message of the PCE, determine that the session between the PCEs of the PCC is interrupted; When the PCC does not receive the keep-alive message of the PCE within a predetermined time interval, determine that the session between the PCEs of the PCC is interrupted; When it is detected that the transmission control protocol TCP connection between the PCC and the PCE fails, it is determined that the session between the PCEs of the PCC is interrupted. 7. The method according to claim 5, characterized in that, after determining the primary PCE according to preset priority elections, the method further comprises: Determine the slave PCE according to the preset priority election; Send a role request message to the slave PCE. 8. The method according to claim 1, wherein the attribute information comprises: an identification field carried in an Open message. 9. A device for notifying connection capabilities, comprising: A creation module, configured to create a PCEP message of the path calculation element protocol at the PCC of the path calculation client, wherein the PCEP message carries attribute information used to indicate that the PCC has a multi-connection capability; The notification module is configured to notify one or more of the PCEs of the PCEP message during the PCEP session phase between the PCC and the PCE. 10. The device according to claim 9, further comprising: A receiving module, configured to receive a role request message of the PCE after the notification module notifies the PCEP message to one or more of the PCEs, wherein the role request message carries the priority of the PCE Attributes; An allocation module, configured to allocate a PCE role to the PCE according to the priority attribute. 11. The device according to claim 10, wherein the distribution module comprises: A comparison unit, configured to compare the priority attribute of the PCE with the priority attribute of the currently connected main PCE; A determining unit configured to assign the PCE role of the PCE as the master PCE when the priority attribute of the PCE is higher than the priority attribute of the currently connected master PCE. 12. The device according to claim 10, wherein the PCE roles include: a master PCE, a slave PCE, a parent PCE, and a child PCE. 13. The device of claim 9, wherein the device comprises: A determining module, configured to determine that the session interruption between the PCEs of the PCC is performed after the notification module notifies the PCEP message to one or more of the PCEs; The first election module is configured to elect and determine the primary PCE according to a preset priority; A processing module, configured to send a role request message to the master PCE, and switch the connection with the PCE to the master PCE. 14. The device according to claim 13, wherein the determining module determines that the session interruption between the PCEs of the PCC includes at least one of the following: When the PCC receives the close message of the PCE, determine that the session between the PCEs of the PCC is interrupted; When the PCC does not receive the keep-alive message of the PCE within a predetermined time interval, determine that the session between the PCEs of the PCC is interrupted; When it is detected that the transmission control protocol TCP connection between the PCC and the PCE fails, it is determined that the session between the PCEs of the PCC is interrupted. 15. The device according to claim 13, further comprising: The second election module is configured to determine the slave PCE according to the preset priority election after the first election module determines the master PCE according to the preset priority election; A sending module, configured to send a role request message to the secondary PCE. 16. The device according to claim 9, wherein the attribute information comprises: an identification field carried in an Open message.