CN1661984A - Method for treating multiplexing segments of loop chain in automatic switching optical network - Google Patents

Abstract

The invention discloses a method for processing a link protected by a multiplex section ring in an automatic switching optical network, comprising: each node on the multiplex section ring assigns the connected multiplex section ring links to different protection types The link channel is bound into multiple traffic engineering links with different protection attributes according to the protection type; the obtained status information of each traffic engineering link is published in the network. The present invention solves the problems such as the processing and state publishing of multiplex section ring links within the framework of the existing automatic switching optical network, retains the original functions and characteristics of the multiplex section ring, and makes ring topology and MESH networking very Well combined.

Description

The Processing Method of Multiplex Section Ring Link in Automatic Switching Optical Network

technical field

The invention relates to an automatic switching optical network link management technology, in particular to a processing method for a multiplex section ring link in an automatic switching optical network.

Background technique

Optical networks usually include the Synchronous Digital Hierarchy (SDH) developed by the International Telecommunications Union (ITU-T), the Synchronous Optical Network (Sonet) in North America, and wavelength networks. Traditionally, they are systems based on centralized management. Initially, optical connections are established between network nodes using permanent connections, and manual intervention is required for the creation, maintenance, and removal of optical connections. With the continuous growth of the types and quantities of services carried by the network, the optical network system consisting only of permanent connections cannot meet the requirements of dynamic and flexible networking.

In order to solve this problem, ITU-T proposed the Automatically Switched Optical Network (ASON) architecture. The networking form of ASON is based on the mesh (MESH) network topology, which adds a control plane to the traditional optical network. The optical network node first obtains the connection relationship between the node and other nodes through the local link discovery technology; In the control plane, the link state routing protocol is used to publish the node and the link state in the network, and receive the state release of other network nodes in the network. Finally, each node in the optical network can get a description with accurate network information. The "network map" of the topology, the "network map" includes: nodes, links, resources and other information.

When a node in the optical network is required to establish a connection by the client device or the management system, use the information of the "network map" and combine a certain routing algorithm to obtain a feasible path; then drive the node on the path to establish through the signaling protocol Cross-connect until the destination node, thus completing the dynamic establishment of optical connections. When link resources change due to dynamic establishment, removal, or failure of network connections, the corresponding optical network nodes also need to release updated node and link status information in time to achieve resynchronization of the "network map".

In ASON, in order to solve the relationship between the network control plane and the transmission plane when they are completely physically separated, ASON provides the Link Management Protocol (LMP). The functions of the Link Management Protocol include: control channel management, Link connectivity verification, link attribute correlation, and fault management. Control channel management realizes the establishment of control channel connections between adjacent network nodes and provides communication channels for other functions of link management. This process can be realized through automatic discovery or configuration of the management plane; link connectivity is verified by sending in-band messages , such as: SDH can check the transmission link connection relationship of adjacent network nodes by sending J0 bytes, associate the codes of the link for the network nodes at both ends of the link, and find possible wrong connections; for two network nodes In the case of a large number of parallel link connections, these links can be bundled into a single "Traffic Engineering Link (TE Link)" in order to reduce the burden of the routing protocol that publishes the link state, and the link attribute related check link The nodes on both sides have the same binding relationship between the traffic engineering link and the transmission link; the fault management provides a mechanism for consistent fault location.

In addition, for the links sharing some physical resources in the automatic switching optical network, since once the shared resources fail, these links will also fail at the same time, so these links sharing the same physical resources are usually bundled into a shared risk chain Road group (SRLG, Shared Risk Link Group). When selecting routes for certain services, avoid selecting links in the same SRLG. For example, in network recovery and protection, the primary and backup routes should ensure the separation of physical resources. Therefore, during the selection of such services, attention should be paid to selecting links with different SRLGs.

The basic topology of traditional optical networks is usually based on rings, among which the bidirectional multiplex section protection ring (MSPRing) in SDH network and the bidirectional line switching ring (BLSR) in Sonet can carry more traffic than other ring protection methods. Therefore, it has been widely used in various optical network layers. In the present invention, for the convenience of description, the two-way multiplex section protection ring and the two-way line switching ring are collectively referred to as the multiplex section ring, and the data link (Data Link) on the multiplex section ring is called the multiplex section ring link .

MSRs generally need to reserve half of the bandwidth resources for protection, but its advantage is that services can be restored in a short time after a network failure occurs. Although the automatic optical network introduces more intelligence into the network nodes and requires less protection resources, the dynamic recovery time of the existing automatic optical network is still long, and it is difficult to meet the service recovery time requirement of 50 ms.

Therefore, the current automatic switching optical network will also retain the ring structure in the network, thus facing the coexistence of a ring topology and a MESH topology. During this transition period, the physical topology of the network is based on MESH, and multiple virtual rings are established on this MESH topology to support traditional multiplex section ring services. On the one hand, this is due to the consideration of the shortcomings of the recovery time of the MESH network, and on the other hand, it is also due to the consideration of the smooth evolution of the network during the transition to ASON.

This kind of network structure where MESH and multiplex section ring coexist is shown in Figure 1. The network nodes A-B-C-D-E-F between two user equipments form a MESH network, and nodes A-B-C-D-E-F form a virtual multiplex section ring. Only part of the time slots are used for the protection of the multiplex section ring, and other time slots are unprotected.

According to ITU-T recommendation G.841, the channels of the links in the multiplex section ring can be divided into three types: protected, protected, and unprotected without preemption. In addition, there are usually two types of multiplex section rings: two-fiber and four-fiber. Each fiber of the two-fiber multiplex section ring is used to carry service transmission in one direction. Figure 2 is an example of the protection status of each channel of a two-fiber multiplex section ring link. The link is divided into 16 channels by time slots, and the protection types of channels 1-3, 5, and 8 are protected channels , carrying protected services; channels 9-11, 13, and 16 are protection channels, each channel protects the previous protected channels in sequence, and additional services can be carried on the protection channel, and these services are when the protected channel of the multiplex section fails will be preempted; other channels 4, 6, 7, 12, 14, and 15 are unprotected channels, and unprotected services can be carried on the unprotected channels.

The situation of four-fiber is similar to that of two-fiber, except that there are two fibers in each transmission direction. The protection relationship of the channel is not that half of the channels under the two-fiber protect the other half of the channel, but one fiber protects the other fiber, that is, the one on the working port The channel is protected, and the channel on the protection port is protected. The two are completely corresponding to the channel, and each data link can also have an unprotected channel.

The existing ITU and IETF proposals and drafts on automatic switched optical networks do not impose special restrictions on the processing method of the multiplex section ring. According to the existing processing method, the multiplex section ring in the network is also treated as an ordinary MESH network. , losing the original functions and advantages of the MSR.

In addition, IETF's existing General Multiprotocol Labeling Protocol (GMPLS) deals with multiplex section rings, in Section 3.2 "Link Protection Type" in "Routing Extensions in Support of Generalized MPLS (draft 6)" The following link protection attributes are provided: extra service, no protection, shared protection, dedicated 1:1, dedicated 1+1, and enhanced, among which shared protection, dedicated 1:1, dedicated 1+1, and enhanced all belong to protected property. But the links on the existing multiplex section rings cannot be simply classified into any one of the links with protection attributes. If a new protection type of "multiplex section ring" is introduced for the multiplex section ring, this type also needs to carry the protection attribute table of the channel, which not only increases the traffic of the link state flooded by the routing protocol, but also requires Nodes that do not support ring topology also understand multiplex section rings, which increases the complexity of network protocol implementation.

In a word, there is no effective solution in the prior art to deal with the multiplex section ring in the automatic switching optical network.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for processing the MSP ring link in the Automatic Switching Optical Network, so that the MSP ring and the Automatic Switching Optical Network can be well combined, and both the multiplex section The original functions and characteristics of the ring do not need to be modified too much on the original protocol of the automatic switching optical network.

A method for processing multiplex section ring links in an automatic switching optical network provided by the present invention comprises the following steps:

a) Each node on the multiplex section ring binds channels of different protection types in the connected multiplex section ring links into more than one traffic engineering link with different protection attributes according to the protection type;

b) Publishing the state information of each traffic engineering link obtained in step a) in the automatic switched optical network.

The multiplex section ring described in the method is a two-fiber bidirectional multiplex section ring, and the multiplex section ring link includes a protected channel and a protection channel;

Then step a) the link channel binding process is specifically to bind the protected channel in the multiplex section ring link as a traffic engineering link with the protected attribute, and the multiplex section ring link Protection channels are bound as traffic engineering links with additional business attributes.

The protected attribute in this method is specifically a shared protection attribute.

The multiplex section ring described in the method is a four-fiber bidirectional multiplex section ring, one of the multiplex section ring links in one direction includes a protected channel, and another multiplex section ring link in the same direction includes a protected channel;

Then step a) the link channel binding process is specifically to bind the protected channel in the first multiplex section ring link as a traffic engineering link of the protected attribute; Use the protection channel in the segment ring link to bind it as a traffic engineering link with additional service attributes.

The protected attribute described in this method is specifically an enhanced protection attribute.

The multiplex section ring link in the method further includes an unprotected channel that cannot be preempted;

Then the step a) further includes binding the unprotected and non-preempted channel of the MSR link as a traffic engineering link with unprotected attribute.

The method further includes between steps a) and b):

a11) An end node of the multiplex section ring link sends an association establishment request message of the traffic engineering link identifier to the opposite end node through an in-band control channel;

a12) After receiving the association establishment request message, the peer node establishes between the identifier assigned by the current node for the traffic engineering link and the identifier assigned by the originating node sending the current association establishment request message for the same traffic engineering link Associating, returning a response message of an association establishment request to the originating node;

a13) After receiving the response message, the originating node establishes an association between the identifier assigned by the own node for the traffic engineering link and the identifier assigned by the peer node for the same traffic engineering link.

In this method, the association establishment request message at least includes: the originating node identifier, the data link identifier, and the identifier allocated locally by the originating node for the traffic engineering link.

The in-band control channel in the method is the overhead J0 byte in the SDH frame structure.

The method further includes between steps a) and b):

a21) The node at one end of the traffic engineering link sends the binding relationship information of the link channel in the local traffic engineering link to the peer node of the traffic engineering link;

a22) After the peer node of the traffic engineering link receives the binding relationship information, it judges whether there is a local traffic whose binding relationship of the link channel is consistent with the binding relationship information received according to the binding relationship information If it is an engineering link, return a consistency check success response message to the originating node that sent the current binding relationship information; otherwise, return a consistency check failure response message to the originating node.

In the method, the binding relationship information between the traffic engineering link and the link channel is sent through a link summary message;

The success response of the consistency check is sent through a link summary response message;

The consistency check failure response is sent through a link summary negative acknowledgment message.

In this method, the binding relationship information between the traffic engineering link and the link channel at least includes: the originating node identifier, the identifier locally assigned by the originating node to the traffic engineering link, and the data to which the traffic engineering link belongs. The identification of the link and the set of bound channel numbers;

The consistency check success response message at least includes: the peer node identifier, the identifier allocated by the peer node to the traffic engineering link, and the identifier allocated by the originating node to the traffic engineering link;

The response message of failure of the consistency check includes at least: an error code and an identifier assigned by the peer node to the traffic engineering link.

In the method, the binding relationship information between the traffic engineering link and the link channel further includes: the protection attribute of the traffic engineering link.

The method further comprises after step a):

a31) Each node on the multiplex section ring classifies the traffic engineering links belonging to the same data link into the same risk sharing link group;

a32) each node sends the registration information of the risk sharing link group to the directory server in the network;

a33) The directory server judges whether the risk-sharing link group has been registered according to the current registration information received, and if so, returns the registered risk-sharing link group identifier to the current node sending the registration information, otherwise, The risk sharing link group assigns a new identity and returns the new identity to the current node.

The registration information in this method includes: the current node’s own node identifier, the local port identifier, the identifier assigned by the local end to the traffic engineering link in the risk sharing link group, and the current node’s information about the risk sharing link group The identifier of the peer node, the identifier of the peer port, and the identifier allocated by the peer node to the traffic engineering link in the risk sharing link group.

The step b) of the method specifically includes: the nodes at both ends of the traffic engineering link publish the state information of the traffic engineering link to other nodes in the network through a link state routing protocol.

The step b) of the method specifically includes: the nodes at the two ends of the traffic engineering link send the status information of the traffic engineering link to a publishing device in the network, and the publishing device sends the status information of the traffic engineering link to the network publish in .

The traffic engineering link state information in the method at least includes: the identification assigned by the local end of the publishing node to the traffic engineering link, and the identification assigned by the peer node of the traffic engineering link to the traffic engineering link of the local node. The identifier of the traffic engineering link, the granularity of the traffic engineering link, the maximum bandwidth, the available bandwidth, and the identifier of the risk sharing link group to which the traffic engineering link belongs.

The multiplex section ring described in the method is a bidirectional multiplex section protection ring, or a bidirectional line switching ring, or a unidirectional multiplex section protection ring, or a unidirectional line switching ring.

As can be seen from the above, the processing method of the multiplex section ring link in the automatic switching optical network provided by the present invention divides the data link on the multiplex section ring into multiple flow engineering link, so that each traffic engineering link only corresponds to a set of link channels of one protection type, so that each traffic engineering link can be given a single protection attribute to transmit a service. Within the framework of the existing automatic switching optical network of ITU and IETF, the processing and status publishing of multiplex section ring links are solved, the original functions and characteristics of the multiplex section ring are retained, and the ring topology and MESH networking nice combination.

Description of drawings

Figure 1 is a schematic diagram of a mixed networking example of MESH and multiplex section ring;

Fig. 2 is a schematic diagram of the protection state of each channel in the link on the two-fiber multiplex section ring;

Fig. 3 is a flow chart of a preferred embodiment of the present invention;

Fig. 4 is a schematic diagram of the format of the sub-object "use channel set" in the DATA_LINK object in the preferred embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The invention is applied to the automatic switching optical network, and the topological shape of the network is a mixed MESH and multiplex section ring, and the multiplex section ring can be a real network ring topology, or virtualized on the MESH topology.

The prior art supports bundling multiple completely equivalent data links in routing selection into one traffic engineering link with a certain protection attribute in an automatic switching optical network. Link protection attributes in ASON can be classified into: extra service, unprotected, protected, dedicated 1:1, dedicated 1+1, enhanced, etc. Corresponding to the link on the multiplex section protection ring, the protected channel, that is, the slot can support the protected service, and the additional service can be transmitted on the protected time slot. However, since only part of the time slots of a data link in the multiplex section ring are used to transmit services of a certain protection attribute, and other time slots can transmit services of other protection attributes, it is difficult to classify the links of the multiplex section ring into any traffic engineering link.

The solution of the present invention is to split the data link on the multiplex section ring into traffic engineering links with different protection attributes, and each traffic engineering link corresponds to a channel set of a protection type, so that the automatic switching optical network can It is convenient to use the link management protocol to process the multiplex section ring links.

The following takes a two-fiber multiplex section ring as an example to describe a preferred embodiment of the present invention in detail, as shown in FIG. 3 .

Step 301, after each network node in the MSP ring topology detects that its link has a MSP ring topology, it binds the link channels of the same protection type in the MSP ring link as A traffic engineering link with a protection attribute, such that the data link on the multiplex section ring is split into multiple traffic engineering links.

Then the data link shown in Figure 2 can be split into three traffic engineering links, as shown in Table 1: Traffic engineering link ID protection attribute Bandwidth (in channels) Corresponding channel set 1 Protected 5 1-3, 5, 8 2 additional business 5 9-11, 13, 16 3 unprotected 6 4, 6, 7, 12, 14, 15

Table 1

The data link on the multiplex section ring is divided into: 1) The protected service traffic engineering link, the protection type of the data channel included is the protected channel, and the corresponding multiplex section ring protection attribute is protected. For two-fiber multiplexing For segment rings, it is best to use the shared protection attribute among the protected attributes; 2) Additional service traffic engineering links, including protection channels, corresponding to the multiplexing segment ring protection attribute is additional, which can carry additional services; 3) Unprotected traffic engineering Links, including unprotected channels that cannot be preempted, correspond to the MSP ring protection attribute of unprotected, and can carry unprotected services. In this way, link channels of each protection type are bound as a traffic engineering link of a protection attribute, and a traffic engineering link of each protection attribute carries a service of a protection type.

In addition, some two-fiber multiplex section ring links may not have unprotected channels. In this case, the data link in each direction of the two-fiber multiplex section ring will be divided into protected service traffic engineering links and Two additional business traffic engineering links.

After a new traffic engineering link is established, since the nodes at both ends of the data link on the MSP may assign different identifiers to the same traffic engineering link, it is usually necessary The association is established, thus, steps 302-303 should be included.

In step 302, one end node of the data link on the MSP sends an association establishment request message of the new traffic engineering link identifier to the opposite end node through the in-band control channel, for example, through the J0 byte.

The association establishment request message includes: the identifier of the originating node sending the association request, the identifier of the data link, and the identifiers locally allocated by the originating node to the three newly-built traffic engineering links.

Step 303: After receiving the association establishment request message, the peer node establishes an association between the locally assigned ID and the ID assigned to the originating node for the same traffic engineering link, and then returns a response to the association establishment request to the originating node information.

The response message includes: the peer node identifier, the data link identifier, and the identifiers locally assigned by the peer node to the three traffic engineering links.

In step 304, after receiving the response message, the originating node also establishes an association between the identifiers of each traffic engineering link locally allocated to the originating node and the peer node.

After the traffic engineering link identification association is established, in order to ensure that the network nodes at both ends of the traffic engineering link have the same binding relationship for binding the link channel as the traffic engineering link, the consistency of the binding relationship is generally checked. Including steps 305-306.

Step 305, the network node at one end of the traffic engineering link initiates a link channel binding consistency check request of the traffic engineering link, and sends the local binding relationship information of the link channel in the traffic engineering link to the traffic engineering link peer node.

The binding relationship information includes at least: the identifier of the originating node that sends the information, the identifier locally assigned by the originating node to the traffic engineering link, the identifier of the data link to which the traffic engineering link belongs, and the bound channel A set of sequence numbers, and the binding relationship information may also include the protection attribute of the traffic engineering link.

Step 306, after the peer node of the traffic engineering link receives the binding relationship information, it compares it with the local link channel binding relationship, and judges whether there is a traffic engineering link locally, and the binding relationship of its link channel If it exists, the consistency check passes, and a consistency check success response is returned to the originating node; otherwise, a consistency check failure response is returned to the originating node.

The success response of the consistency check includes at least: the identity of the peer node, the flag allocated by the peer node to the traffic engineering link, and the identity allocated by the originating node to the traffic engineering link; the consistency failure response includes at least Including: error code, identifier assigned by the peer node to the traffic engineering link.

Since the three traffic engineering links established above are all related to the same data link and should belong to the same risk sharing link group (SRLG), this embodiment further divides the three traffic engineering links into the same SRLG, so that Avoid problems such as: multiple traffic engineering links on the same MSP ring link are selected at the same time during route selection. Therefore, steps 307-308 will also be included.

Step 307, the network node classifies the three traffic engineering links on the same data link in the multiplex section ring into the same risk sharing link group, and sends registration information to the directory server in the network, and the newly formed risk sharing link group road group to register.

Wherein, the registration information includes at least: the node identifier, the port identifier, the traffic engineering link identifier in the risk sharing link group, the peer node identifier at the other end of the risk sharing link group, the peer port identifier, and the peer allocation traffic engineering link ID. The directory server is a device set in the network for registration service, and the network nodes can centrally send the registration information to the directory server according to the IP address of the directory server.

Step 308, after receiving the registration information, the directory server determines whether there is already registration information about the risk sharing link group locally, and if it is found that there is already registration information about the risk sharing link group, then the registered risk sharing link group The link group identifier is returned to the current network node; otherwise, the registration information is recorded, and a new identifier is assigned to the risk sharing link group and returned to the current network node.

The existing registration information about the risk-sharing link group in the directory server mentioned here may be registered by the node at the other end of the risk-sharing link group.

In step 309, the network nodes at both ends of the traffic engineering link on the MSR publish the status information of the newly established traffic engineering link to other nodes in the network through a link state routing protocol.

In this way, each network node on the multiplex section ring publishes the established traffic engineering link status information in the network, and each node in the network updates its own "network map" according to the obtained information to realize Resynchronization of the "Web Map".

The traffic engineering link status information includes at least: the identity assigned by the publishing node's local end to the traffic engineering link, the identity assigned to the traffic engineering link by the peer node of the traffic engineering link, and the granularity of the traffic engineering link , maximum bandwidth, available bandwidth, SRLG identifier to which the traffic engineering link belongs, etc.

In addition, step 309 can also be replaced by the network nodes at both ends of the traffic engineering link sending the status information of the traffic engineering link to a publishing device in the network, and the publishing device uniformly publishes the status information of the traffic engineering link on the network publish in .

The originating node and peer node mentioned above are not specific, but are arbitrary regulations for the convenience of description. Any node on the multiplex section ring can be used as the originating node, so the node at the other end of the link is the peer node. .

Since there is no mechanism for splitting a link into multiple traffic engineering links in the existing IETF link management protocol (draft), to solve this problem, only need to modify the "link attribute" in the link management protocol Related" function. It involves the adaptation of the link summary message (LinkSummary). Traditionally, the LinkSummary message is generally used to carry information about traffic engineering links bundled by multiple data links. The message consists of a TE_LINK object and at least one DATA_LINK object. The TE_LINK carries the traffic engineering link identifier, representing a Traffic engineering link. In the present invention, in order to enable the message to represent the traffic engineering link obtained by splitting the data link, it is necessary to add a sub-object "used channel set" to the DATA_LINK object to carry the channel set information used by the traffic engineering link.

The sub-object format of "use channel collection" in the DATA_LINK object is shown in Figure 4, where "protection type" includes 1 byte long, which is the type of this sub-object; "length" includes 1 byte long, which is byte-based The length of the sub-object in units; the "number of channels" includes 2 bytes, which is the number of channels used by the traffic engineering link for this data link; followed by a list of channel numbers, and each channel number list includes a length of 2 bytes. In this way, if it is necessary to send traffic engineering link information during the above-mentioned interaction process between nodes or between nodes and network devices, the modified LinkSummary message can be used.

In addition, in the process of verifying the consistency of the binding relationship described in step 306, if the peer node judges the binding relationship information carried in the LinkSummary message sent by the originating node, verify the consistency of the binding relationship of the traffic engineering link If passed, return a link summary acknowledgment message (LinkSummaryAck) to the originating node to notify the originating node that the traffic engineering link has been added successfully; otherwise, send a link summary negative acknowledgment message (LinkSummaryNack) to notify the originating node that the traffic engineering link has failed to increase , and at the same time send a warning message to the network management system.

The processing of the four-fiber multiplex section ring link is similar to that of the two-fiber one.

When there is no unprotected channel in the four-fiber multiplex section ring link, among the two data links in each transmission direction, one data link has only the protected channel, and the other data link in the same direction There is only a protection channel in the link. At this time, the former is used as a protected service traffic engineering link, and its protection attribute is protected, and it is better to have an enhanced protection attribute. The latter, as an additional service traffic engineering link, its protection attribute is additional.

If each data link of the four-fiber multiplex section ring link also includes an unprotected non-preempted channel, bind the unprotected non-preempted channel in each data link as an unprotected traffic engineering link, Its protection attribute is Unprotected.

For the case of a four-fiber multiplex section ring, the traffic engineering links on one data link are also bound into a risk-sharing link group.

The data link mentioned in the embodiment of the present invention generally corresponds to one optical fiber, but the technical solution of the present invention can also be applied to situations where each optical fiber contains multiple data links, such as: in the case of wavelength division multiplexing , each wavelength channel in the fiber can be used as a data link.

The multiplex section ring mentioned in the embodiment of the present invention refers to a bidirectional multiplex section protection ring or a bidirectional line switching ring, and the technical solution of the present invention is also applicable to the case of a unidirectional multiplex section protection ring or a link switching ring.

The processing method of the scheme of the invention is simple and effective, and lays a foundation for the combination of the multiplexing section ring and the automatic switching optical network.

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

Claims (19)

1, a kind of processing method of multiplexing section ring link in automatic switching optical network, is characterized in that, comprises the following steps: a) Each node on the multiplex section ring binds channels of different protection types in the connected multiplex section ring links into more than one traffic engineering link with different protection attributes according to the protection type; b) Publishing the state information of each traffic engineering link obtained in step a) in the automatic switched optical network. 2. The method according to claim 1, wherein the multiplex section ring is a two-fiber bidirectional multiplex section ring, and the multiplex section ring links include protected channels and protection channels; Then step a) the link channel binding process is specifically to bind the protected channel in the multiplex section ring link as a traffic engineering link with the protected attribute, and the multiplex section ring link Protection channels are bound as traffic engineering links with additional business attributes. 3. The method according to claim 2, wherein the protected attribute is specifically a shared protection attribute. 4. The method according to claim 1, wherein the multiplex section ring is a four-fiber bidirectional multiplex section ring, one of the multiplex section ring links in one direction includes a protected channel, and one of the multiplex section ring links in the same direction Another MSP ring link includes a protection channel; Then step a) the link channel binding process is specifically to bind the protected channel in the first multiplex section ring link as a traffic engineering link of the protected attribute; Use the protection channel in the segment ring link to bind it as a traffic engineering link with additional service attributes. 5. The method according to claim 4, wherein the protected attribute is specifically an enhanced protection attribute. 6. The method according to claim 2 or 4, characterized in that the multiplex section ring link further includes an unprotected channel that cannot be preempted; Then the step a) further includes binding the unprotected and non-preempted channel of the MSR link as a traffic engineering link with unprotected attribute. 7. The method according to claim 1, characterized in that, between steps a) and b), further comprising: a11) An end node of the multiplex section ring link sends an association establishment request message of the traffic engineering link identifier to the opposite end node through an in-band control channel; a12) After receiving the association establishment request message, the peer node establishes between the identifier assigned by the current node for the traffic engineering link and the identifier assigned by the originating node sending the current association establishment request message for the same traffic engineering link Associating, returning a response message of an association establishment request to the originating node; a13) After receiving the response message, the originating node establishes an association between the identifier assigned by the own node for the traffic engineering link and the identifier assigned by the peer node for the same traffic engineering link. 8. The method according to claim 7, wherein the association establishment request message at least includes: the originating node identifier, the data link identifier, and the identifier allocated locally by the originating node for the traffic engineering link. 9. The method according to claim 7, wherein the in-band control channel is an overhead J0 byte in the SDH frame structure. 10. The method according to claim 1, characterized in that, between steps a) and b), further comprising: a21) The node at one end of the traffic engineering link sends the binding relationship information of the link channel in the local traffic engineering link to the peer node of the traffic engineering link; a22) After the peer node of the traffic engineering link receives the binding relationship information, it judges whether there is a local traffic whose binding relationship of the link channel is consistent with the binding relationship information received according to the binding relationship information If it is an engineering link, return a consistency check success response message to the originating node that sent the current binding relationship information; otherwise, return a consistency check failure response message to the originating node. 11. The method according to claim 10, wherein the binding relationship information between the traffic engineering link and the link channel is sent through a link summary message; The success response of the consistency check is sent through a link summary response message; The consistency check failure response is sent through a link summary negative acknowledgment message. 12. The method according to claim 10, wherein the binding relationship information between the traffic engineering link and the link channel at least includes: the identity of the originating node, the identity of the originating node locally as the traffic engineering The identification of the link allocation, the identification of the data link to which the traffic engineering link belongs, and the set of bound channel serial numbers; The consistency check success response message at least includes: the peer node identifier, the identifier allocated by the peer node to the traffic engineering link, and the identifier allocated by the originating node to the traffic engineering link; The response message of failure of the consistency check includes at least: an error code and an identifier assigned by the peer node to the traffic engineering link. 13. The method according to claim 12, wherein the binding relationship information between the traffic engineering link and the link channel further includes: the protection attribute of the traffic engineering link. 14. The method according to claim 1, characterized in that, between steps a) and b), further comprising: a31) Each node on the multiplex section ring classifies the traffic engineering links belonging to the same data link into the same risk sharing link group; a32) each node sends the registration information of the risk sharing link group to the directory server in the network; a33) The directory server judges whether the risk-sharing link group has been registered according to the current registration information received, and if so, returns the registered risk-sharing link group identifier to the current node sending the registration information, otherwise, The risk sharing link group assigns a new identity and returns the new identity to the current node. 15. The method according to claim 14, wherein the registration information includes: the local node ID of the current node, the port ID of the local end, and the allocation of traffic engineering links in the risk sharing link group by the local end. ID of the current node, the peer node ID of the risk sharing link group, the peer port ID, and the ID assigned by the peer node to the traffic engineering link in the risk sharing link group. 16. The method according to claim 1, wherein the step b) specifically comprises: the nodes at both ends of the traffic engineering link publish the state information of the traffic engineering link to other nodes in the network. 17. The method according to claim 1, wherein the step b) specifically comprises: the nodes at both ends of the traffic engineering link send the status information of the traffic engineering link to the publishing device in the network, and the The publishing device publishes the state information of the traffic engineering link in the network. 18. The method according to claim 1, wherein the state information of the traffic engineering link at least includes: the identity assigned by the local end of the issuing node to the traffic engineering link, the information about the traffic engineering link of the local node The identifier assigned by the peer node of the link to the traffic engineering link, the granularity of the traffic engineering link, the maximum bandwidth, the available bandwidth, and the identifier of the risk sharing link group to which the traffic engineering link belongs. 19. The method according to claim 1, wherein the multiplex section ring is a bidirectional multiplex section protection ring, or a bidirectional line switching ring, or a unidirectional multiplex section protection ring, or a unidirectional line switching ring .

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