WO2005083913A1 - Procede de traitement destinee a multiplexer une liaison d'anneaux a segments dans un reseau optique d'echange automatique - Google Patents

Procede de traitement destinee a multiplexer une liaison d'anneaux a segments dans un reseau optique d'echange automatique Download PDF

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Publication number
WO2005083913A1
WO2005083913A1 PCT/CN2004/001474 CN2004001474W WO2005083913A1 WO 2005083913 A1 WO2005083913 A1 WO 2005083913A1 CN 2004001474 W CN2004001474 W CN 2004001474W WO 2005083913 A1 WO2005083913 A1 WO 2005083913A1
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Prior art keywords
link
traffic engineering
node
identifier
channel
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PCT/CN2004/001474
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English (en)
Chinese (zh)
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Yongliang Xu
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Huawei Technologies Co., Ltd.
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Publication of WO2005083913A1 publication Critical patent/WO2005083913A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks

Definitions

  • the present invention relates to the technology of automatic switching optical network link management, in particular to a method for processing a multiplex segment ring link in an automatic switching optical network.
  • Optical networks usually include the Synchronous Digital System (SDH) formulated by the International Telecommunication Union (ITU-T), the Synchronous Optical Network (Sonet) in North America, and the wavelength network. They are traditionally a system based on centralized management. Initially, optical connections were established between network nodes using permanent connections. The creation, maintenance, and removal of optical connections required manual intervention. With the continuous increase in the types and number of services carried by the network, the optical network system consisting of only permanent connections can no longer meet the dynamic and flexible networking requirements.
  • SDH Synchronous Digital System
  • ITU-T International Telecommunication Union
  • Sonet Synchronous Optical Network
  • ASON Automatically Switched Optical Network
  • ASON's networking form is based on a mesh (MESH) network topology, which adds a control plane to the traditional optical network.
  • the optical network node first obtains the connection relationship between this node and other nodes through link local discovery technology; then In the control plane, the link state routing protocol is used to publish the node and link status in the network, and to receive the status of other network nodes in the network. Finally, each node in the optical network can get a description of the network
  • the "network map" of accurate topology, "network map” includes: nodes, links, resources and other information.
  • the information on the "network map" is used to combine with a certain routing algorithm to obtain a feasible path; then the nodes on the path are driven to establish a signaling protocol.
  • Cross-connect to the destination node to complete the dynamic establishment of the optical connection.
  • the corresponding optical network nodes also need to publish updated nodes and links in a timely manner. Status information to resynchronize the "network map".
  • ASON in order to solve the association relationship between the network control plane and the transmission plane when they are completely physically separated, ASON provides a 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 enables the establishment of control channel connections between adjacent network nodes and provides communication channels for other functions of link management. This process can be achieved through automatic discovery or configuration of the management plane; link connectivity verification can be achieved by sending in-band messages
  • SDH can check the connection relationship of the transmission links of adjacent network nodes by sending J0 bytes, and associate the link codes of the links for the network nodes at both ends of the link to find possible misconnections.
  • SRLG Shared Risk Link Group
  • the basic topology of traditional optical networks is usually based on rings.
  • the bidirectional multiplex segment protection ring (MSPRing) in SDH network and the bidirectional line switching ring (BLSR) in Sonet can carry more than other ring protection methods. Services have been widely used at various optical network levels.
  • the bidirectional multiplex section protection ring and the bidirectional line switching ring are collectively referred to as a multiplex section ring, and the data link (Data Link) on the multiplex section ring is referred to as a multiplex section ring link.
  • the multiplex segment ring usually needs to reserve half of the bandwidth resources for protection, but its advantage is that it can restore services in a short time after a network failure.
  • the automatic optical network introduces more intelligence to 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 50ms service recovery time requirement.
  • the current automatic switching optical network will also retain the ring structure in the network, thus facing a situation where a ring topology and a MESH topology coexist.
  • the physical topology of the network is based on the MESH.
  • multiple virtual rings have been established on this MESH topology.
  • this is a consideration of the shortcomings of the MESH network in terms of recovery time.
  • it is also a consideration of the smooth evolution of the network during the transition to ASON.
  • FIG. 1 This network structure in which MESH and multiplex segment ring coexist, as shown in FIG. 1.
  • the network node ABCDEF between two user equipments forms a MESH network.
  • node ABCDEF forms a virtual multiplex segment ring.
  • the channel uses only part of the time slots for protection of the multiplex segment ring, and the other time slots are unprotected.
  • the channels of the links in the multiplex segment ring can be divided into three categories: protected, protected, unprotected and not preempted.
  • the multiplex segment ring usually has two fibers and four fibers. Each fiber of the two-fiber multiplex segment 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 segment ring link.
  • the link is divided into 16 channels according to time slots, of which the protection type of ⁇ 1-3, 5, and 8 channels are the protected channels. 9-11, 13, 16 channels are protection channels, and each channel sequentially protects the front protected channel, and the protection channel can carry additional services. When these services fail in the multiplex segment, the protected channel fails. Will be preempted; other channels 4, 6, 7, 12, 14, 15 are unprotected channels, and unprotected services can be loaded on unprotected channels.
  • the situation of four-fiber is similar to two-fiber, except that there are two fibers in each transmission direction.
  • the protection relationship of the channel is not that half of the channel under the two-fiber protects the other half of the channel, but that one fiber protects the other fiber, that is, the working port
  • the channel is protected, and the channel on the protection port is protected.
  • the two are completely channel-to-correspondence, where each data link can also have unprotected channels.
  • the main object of the present invention is to provide a method for processing a multiplex segment ring link in an automatic switched optical network, so that the multiplex segment ring and the automatic switched optical network can be well combined, while retaining the multiplex segment. Ring the original functions and characteristics, without the need to make excessive changes to the original protocol of the automatic switching optical network.
  • the invention provides a method for processing a multiplex segment ring link in an automatic switching optical network. It includes the following steps:
  • Each node on the multiplex segment ring binds the channels of different protection types in the connected multiplex segment ring link to more than one traffic engineering link with different protection attributes according to the protection type; b) Automatic switching The optical network publishes state information of each traffic engineering link obtained in step a).
  • the multiplex segment ring is a two-fiber bidirectional multiplex segment ring, and the multiplex segment ring includes a protected channel and a protection channel;
  • step a) the link channel binding process is specifically binding the protected channel in the multiplex segment ring link to a traffic engineering link with a protected attribute, and The protection channel is bound as a traffic engineering link with additional service attributes.
  • the protected attributes in this method are specifically shared protection attributes.
  • the multiplex section ring is a four-fiber Chinese-direction multiplex section ring.
  • One multiplex section ring link in one direction includes a protection channel, and the other multiplex section ring link in the same direction includes protection. aisle;
  • step a) the link channel binding process is specifically binding the protected channel in the first multiplex segment ring link as a traffic engineering link with a protected attribute; Bind the protection channel in the segment ring link as a traffic engineering link with additional service attributes.
  • the protected attributes in this method are specifically enhanced protection attributes.
  • the multiplex segment ring link further includes an unprotected unpreempted channel; then the step a) further includes binding the unprotected unpreempted channel of the multiplex segment ring link to have an unprotected attribute. Traffic engineering link.
  • steps a) and b) of the method further includes:
  • an end node of the multiplex segment ring link sends an association establishment request message of a traffic engineering link identifier to a peer node through an in-band control channel;
  • the peer node After receiving the association establishment request message, the peer node establishes the peer node locally An association between the identifier allocated for the current traffic engineering link and the identifier allocated for the current traffic engineering link by the sending node that sent the current association establishment request message, and returning a response message to the association node to the sending node;
  • the sending node After the sending node receives the response message, the association between the identifier allocated by the sending node for the current traffic engineering link and the identifier allocated by the opposite node for the current traffic engineering link is established locally.
  • the association establishment request message includes at least: the originating node identifier, the data link identifier, and an identifier allocated locally by the originating node to the traffic engineering link.
  • the in-band control channel in this method is the overhead J0 byte in the SDH frame structure. Between steps a) and b) of the method further includes:
  • 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;
  • the peer node of the traffic engineering link After receiving the binding relationship information, the peer node of the traffic engineering link judges the binding relationship and the received binding relationship of the traffic engineering link in the local corresponding link channel according to the binding relationship information. Whether the information is consistent, if yes, return a consistency check success response message to the originating node that sends the current binding relationship information; otherwise, return a response message that the consistency check fails to the originating node.
  • the binding relationship information between the traffic engineering link and the link channel in the method is sent through a link summary message
  • the consistency check failure response is sent through a link summary negative response message.
  • the binding relationship information between the traffic engineering link and the link channel includes at least: the originating node identifier, the identifier that the originating node locally allocates for the traffic engineering link, and the data to which the traffic engineering link belongs.
  • the consistency check success response message includes at least: the peer node identifier, The identifier assigned by the end node to the traffic engineering link and the identifier assigned by the originating node to the traffic engineering link;
  • the response message that the consistency check fails includes at least: an error code and an identifier allocated by the peer node to the traffic engineering link.
  • the binding relationship information between the traffic engineering link and the link channel further includes: protection attributes of the traffic engineering link.
  • step a) of the method further includes:
  • each node on the multiplex segment ring classifies the traffic engineering links belonging to the same data link into the same risk sharing link group;
  • each node sends registration information of the risk sharing link group to a directory server in the network;
  • the directory server determines whether the risk sharing link group is registered according to the received current registration information, and if so, returns the registered risk sharing link group identifier to the current node that sent the registration information, otherwise, it is The risk sharing link group allocates a new identity and returns the new identity to the current node.
  • the registration information of the method includes: a local node identifier of the current node, a local port identifier, an identifier allocated by a local terminal for a traffic engineering link in the risk sharing link group, and a current node's information about the risk sharing link group.
  • the step b) of the method specifically includes: 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: nodes at both ends of the traffic engineering link send status information of the traffic engineering link to a publishing device in the network, and the publishing device performs the status information of the traffic engineering link in the network release.
  • the state information of the traffic engineering release link includes at least: an identifier allocated by the local end of the publishing node to the traffic engineering link, and a peer node of the local node regarding the traffic engineering link being the traffic engineering link. The assigned identifier, the granularity of the traffic engineering link, the maximum bandwidth, the available bandwidth, and the identity of the risk sharing link group to which the traffic engineering link belongs.
  • 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.
  • the processing method of the multiplex segment ring link provided in the present invention in an automatic switched optical network is to divide the data link on the multiplex segment ring into multiple traffic projects according to its channel protection type. Link, so that each traffic engineering link corresponds to only one type of protection link channel set, so that each traffic engineering link can be given a single protection attribute to transmit a service.
  • the problems of processing and status release of the multiplex segment ring link are solved, and the original functions and characteristics of the multiplex segment ring are retained, so that the ring topology and the MESH networking is well integrated.
  • Figure 1 is a schematic diagram of a hybrid networking example of MESH and multiplex segment ring
  • Figure 2 is a schematic diagram of the protection status of each channel in the link on the two-fiber multiplex segment ring;
  • FIG. 4 is a schematic diagram of a "use channel collection" sub-object format in a DATA-LINK object in a preferred embodiment of the present invention.
  • the present invention is applied to an automatic switching optical network.
  • the topology of the network is a mixed MESH and a multiplex segment ring.
  • the multiplex segment ring may be a real network ring topology, or MESH topology is virtual.
  • the existing technology supports bundling multiple data links that are completely equivalent in routing in an automatic switched optical network into a traffic engineering link with a certain protection attribute.
  • Link protection attributes in the automatic switching optical network can be divided into: extra services, no protection, protected, dedicated 1: 1, dedicated 1 + 1, enhanced, etc.
  • the protected service can be supported on the protected channel, that is, the time slot, and additional services can be transmitted on the protected time slot.
  • the time slots of a data link in the multiplex segment ring are used to transmit services of a certain protection attribute, and other timeslots can transmit services of other protection attributes, it is difficult to attribute the multiplex segment ring link to Into any kind of traffic engineering link.
  • the solution of the invention is to split the data link on the multiplex segment ring into traffic engineering links with different protection attributes, and each traffic engineering link corresponds to a channel set of protection type, so that the automatic switching optical network can Conveniently adopt the link management protocol to process the multiplex segment ring link.
  • Step 301 After detecting that each network node in the multiplex section ring topology has a multiplex section ring topology, each network node binds a link channel of the same protection type in the multiplex section ring link. It is determined as a traffic engineering link with a protection attribute, so the data link on the multiplex segment ring is split into multiple traffic engineering links.
  • the data link in Figure 2 can be split into three traffic engineering links, as shown in Table 1:
  • the data link on the multiplex segment ring is divided into: 1) the protected service traffic engineering link, the data channel protection type included is the protected channel, the corresponding multiplex segment ring protection attribute is protected, and for two-fiber multiplexing
  • the segment ring is preferably the shared protection attribute among the protected attributes; 2) engineering links for additional service traffic, including protection channels, corresponding to the multiplex segment ring protection attribute is an additional service, which can carry additional services; 3) unprotected traffic
  • the engineering link includes unprotected and unpreempted channels, and the corresponding multiplex segment ring protection attribute is unprotected, which can carry unprotected services. In this way, each link channel of protection type is bound to a traffic engineering link of a protection attribute, and the traffic engineering link of each protection attribute carries a service of a protection type.
  • some two-fiber multiplex segment ring links may not have unprotected channels.
  • the data link in each direction of the two-fiber multiplex segment ring is specifically divided into protected service traffic engineering links and Two additional business traffic engineering links.
  • steps 302-303 should be included.
  • Step 302 An end node of a data link on the multiplex segment ring passes an in-band control channel, for example, sends an association establishment request message for creating a new traffic engineering link identifier to a peer node through a J0 byte.
  • the association establishment request message includes: the originating node identifier, the data link identifier, and the identifier that the originating node locally allocates for the three newly created traffic engineering links of the association request.
  • Step 303 After receiving the association establishment request message, the opposite node establishes an association between the identifier allocated locally for the same traffic engineering link and the identifier allocated by the originating node, and then returns a response to the association establishment request to the originating node. Message.
  • the response message includes: the peer node identifier, the data link identifier, and the peer node The ID assigned by the local point to the three traffic engineering links.
  • Step 304 After receiving the response message, the originating node also establishes an association between each traffic engineering link identifier allocated locally to the originating node and the peer node.
  • a consistency check of the binding relationship is generally performed. Include steps 305-306.
  • Step 305 A network node at one end of the traffic engineering link initiates a link channel binding relationship consistency check request of the traffic engineering link, and sends 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 identity of the originating node that sent the information, the identity that the originating node locally allocated to the traffic engineering link, the identity of the data link to which the traffic engineering link belongs, and the bound channel
  • the sequence number set, and the binding relationship information may further include protection attributes 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 channel link binding relationship of the traffic engineering link to determine the binding of the corresponding link channel. Whether the relationship and the received binding relationship information are completely consistent. If they are consistent, the consistency check is passed, 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 consistency check success response includes at least: the peer node identifier, the identifier assigned by the peer node to the traffic engineering link, and the identifier assigned by the originating node for the traffic engineering link; at least in the consistency failure response Including: error code, identification assigned by the peer node to the traffic engineering link.
  • this embodiment further divides the three traffic engineering links into the same SRLG. Avoid such as: Put the same multiplex segment on the ring link When selecting multiple traffic engineering links, they are selected at the same time. Therefore, steps 307-308 will also be included.
  • Step 307 The network node classifies three traffic engineering links on the same data link in the multiplex segment ring into the same risk sharing link group, and sends registration information to a directory server in the network to the newly formed risk sharing chain. Road group for registration.
  • the registration information includes at least: a local node identifier, a port identifier, a traffic engineering link identifier in the risk sharing link group, a peer node identifier at the other end of the risk sharing link group, a peer port identifier, and a peer allocation.
  • Traffic Engineering Link ID The directory server is a device provided for registration service in a network, and a network node may send 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 judges whether the registration information about the risk sharing link group already exists locally. If the registration information of the risk sharing link group is found, the registered risk sharing chain will be registered. The group ID is returned to the current network node; No, J, records the registration information, and assigns a new identifier to the risk sharing link group to return to the current network node.
  • the registration information about the risk sharing link group already existing in the directory server mentioned here may be registered by a node on the other end of the risk sharing link group.
  • Step 309 The network nodes at both ends of the traffic engineering link on the multiplex segment ring publish the state information of the newly established traffic engineering link to other nodes in the network through a link state routing protocol.
  • each network node on the multiplex segment ring publishes the established traffic engineering link state information in the network, and each node in the network then updates its own “network map” according to the obtained information, Resynchronization of "Network Map".
  • the traffic engineering link state information includes at least: an identification of the local end of the issuing node for the traffic engineering link, and a peer node of the traffic engineering link for the traffic engineering link. Identification, the granularity of the traffic engineering link, the maximum bandwidth, the available bandwidth, the SRLG identity to which the traffic engineering link belongs, and so on.
  • step 309 may also be replaced by the network nodes at both ends of the traffic engineering link sending the state information of the traffic engineering link to a publishing device in the network, and the publishing device uniformly sends the state information of the traffic engineering link on the network. For publishing.
  • the originating node and the peer node mentioned above are not specific, but are for the convenience of description. Any node on the multiplex segment ring can be used as the originating node, so that the node on the other end of the link is the peer node. .
  • LinkSummary link summary message
  • the message consists of a traffic engineering link (TE_LINK) object and at least one data link (DATAJJNK) object.
  • TE_LINK traffic engineering link
  • DATAJJNK data link
  • the LINK carries a traffic engineering link identifier, which represents a traffic engineering link.
  • the "use channel collection" sub-object format in the DATA-LINK object is shown in Fig. 4, where "protection type” includes a 1-byte length and is a sub-object type; "length” includes a 1-byte length and is a word The length of this sub-object in units of sections; "Number of channels” includes a 2-byte length, which is the number of channels used by the traffic engineering link for this data link; the channel number list follows, and each channel number list includes a 2-byte length. In this way, during the interaction between the nodes and the nodes, or between the nodes and the network equipment, information of the traffic engineering link needs to be sent, and the modified LinkSummary message can be used.
  • step 306 if the peer node judges the binding relationship information carried in the LinkSummary message sent by the sending node, it verifies the binding relationship consistency of the traffic engineering link. If passed, a link summary response message (LinkSummaryAck) is returned to the originating node to notify the originating node that the traffic engineering link is added successfully; otherwise, a link summary negative response message (LinkSummaryNack) is sent to notify the originating node that the traffic engineering link has failed to increase , And send a warning message to the network management system at the same time.
  • LinkSummaryAck link summary response message
  • LinkSummaryNack link summary negative response message
  • the processing of a four-fiber multiplex segment ring link is similar to that of a two-fiber one.
  • each data link of the four-fiber multiplex segment ring link also includes an unprotected unpreempted channel, bind the unprotected unpreempted channel in each data link to an unprotected traffic engineering link Its protection attribute is unprotected.
  • the traffic engineering link on a data link is also bound to 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 the case where each optical fiber includes multiple data links, for example, in the case of wavelength division multiplexing Each wavelength channel in the fiber can be used as a data link.
  • the multiplex segment ring mentioned in the embodiment of the present invention refers to a bidirectional multiplex segment protection ring or a bidirectional line switching ring.
  • the technical solution of the present invention is also applicable to the case of a unidirectional multiplex segment protection ring or a link switching ring.
  • the processing method of the solution of the present invention is simple and effective, and is suitable for the multiplex segment ring and the automatic switching optical network.
  • the combination laid the foundation.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention concerne un procédé de traitement destiné à multiplexer une liaison de protection d'anneaux à segments dans un réseau optique d'échange automatique. Chaque noeud d'un anneau à segments est lié à des canaux de liaison appartenant à différents types de protection dans la liaison de protection d'anneaux à segments de multiplexage qui se raccorde au noeud en plusieurs liaisons d'ingéniérie de trafic présentant différentes propriétés de protection conformes aux types de protection. Les informations d'état obtenues de chaque liaison d'ingéniérie de trafic dans le réseau sont annoncées. La technique de l'invention règle les problèmes de traitement et d'annonce d'états et analogues pour des liaisons d'anneaux à segments de multiplexage dans le cadre du présent réseau optique d'échange automatique; préserve les fonctions et caractéristiques initiales d'un anneau à segments de multiplexage; et intègre harmonieusement la topologie annulaire et la configuration de réseau maillé.
PCT/CN2004/001474 2004-02-25 2004-12-20 Procede de traitement destinee a multiplexer une liaison d'anneaux a segments dans un reseau optique d'echange automatique WO2005083913A1 (fr)

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CN1295397A (zh) * 1999-11-04 2001-05-16 深圳市中兴通讯股份有限公司 高速率sdh环路上的自动保护倒换方法及装置
CN1416234A (zh) * 2001-10-29 2003-05-07 上海贝尔有限公司 用于波分复用光网的双纤双向通道/复用段倒换环系统

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010124355A1 (fr) * 2009-05-01 2010-11-04 Nortel Networks Limited Support de protection ethernet par anneau de protection partagé ethernet (e-spring)
US9042395B2 (en) 2009-05-01 2015-05-26 Ciena Corporation E-spring support of Ethernet protection

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