WO2008011771A1 - Procédé, équipement de réseau et système permettant d'établir une voie de commutation dans un réseau internet optique - Google Patents

Procédé, équipement de réseau et système permettant d'établir une voie de commutation dans un réseau internet optique Download PDF

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Publication number
WO2008011771A1
WO2008011771A1 PCT/CN2007/000997 CN2007000997W WO2008011771A1 WO 2008011771 A1 WO2008011771 A1 WO 2008011771A1 CN 2007000997 W CN2007000997 W CN 2007000997W WO 2008011771 A1 WO2008011771 A1 WO 2008011771A1
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Prior art keywords
switching path
network
segment
mpls
gmpls
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PCT/CN2007/000997
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English (en)
Chinese (zh)
Inventor
Lei Wang
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Huawei Technologies Co., Ltd.
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Publication of WO2008011771A1 publication Critical patent/WO2008011771A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • H04L45/502—Frame based
    • 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]
    • H04L12/46—Interconnection of networks
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0077—Labelling aspects, e.g. multiprotocol label switching [MPLS], G-MPLS, MPAS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0088—Signalling aspects

Definitions

  • the present invention relates to network interconnection technologies, and more particularly to a method, network device and system for establishing a switching path in an optical internet.
  • Multi- Protocol Label Switch is a switching technology that combines Layer 2 and Layer 3. It introduces a label-based mechanism that separates routing from data forwarding and specifies a packet by label. The path through the network.
  • the MPLS network consists of the core part of the Label Switch Router (LSR) and the edge part of the Label Edge Router (LER).
  • LSR Label Switch Router
  • LER Label Edge Router
  • the role of the LSR can be seen as the combination of an Asynchronous Transfer Mode (ATM) switch and a traditional router, consisting of a control unit and a switching unit.
  • ATM Asynchronous Transfer Mode
  • the role of the LER is to analyze the IP header to determine the corresponding transmission level and label switching.
  • Label Switch Path LSP
  • MPLS technology is currently widely used in IP networks.
  • MPLS-TE is an extended protocol for MPLS to support Traffic Engineer (TE).
  • PSC Packet Switch Capable
  • L2SC Layer 2 Switch Capable
  • Traffic engineering refers to the process of selecting paths based on data traffic in order to balance the traffic load on network links, routers, and switches.
  • the main goal of traffic engineering is to optimize network resource usage and communication performance with efficient and reliable network operations.
  • the core implementation of MPLS-TE is to use constrained routing to calculate explicit paths, use explicit paths to establish LSPs, and use LSPs for traffic distribution.
  • IP + Light technology that is, optical Internet or IP optimized optical Internet, is a core backbone data communication network composed of high-performance Wavelength Division Multiplexing (WDM) devices and T-bit routers.
  • IP technology and WDM-based optical network technology enable backbone routers to connect directly to the optical core network layer through WDM, enabling IP and optical layers Optimized configuration of traffic engineering, protection recovery, quality of service (QoS) and network management to form a simple and efficient network architecture.
  • IP+ optical the core problem in technology is the convergence of the existing IP/MPLS network and optical core network. This problem directly determines the final topology of the optical internet and the related equipment needs to be upgraded.
  • GMPLS General Multi- Protocol Label Switch
  • GMPLS provides a good idea for the integration of IP and optical network technologies.
  • GMPLS inherits the features and protocols of almost all MPLS and is an extension of MPLS to optical networks.
  • GMPLS also requires that the starting point and the ending point of an LSP be the same type of device.
  • the nodes on the LSP are also called labels.
  • Switch router LSR (although it may actually be a device that supports wavelength switching LSC).
  • GMPLS can manage multiple networks with different technologies by using a unified control plane, which provides an important guarantee for the network structure, network management cost reduction and network performance optimization.
  • FIG. 1 is a schematic structural diagram of an overlapping networking system of an optical internet network in the prior art, where 11 and 12 are IP/MPLS networks, and 10 is an optical core network.
  • the overlapping networking model is also called the client-server model, that is, the optical layer network acts as the server and the IP network layer acts as the client layer, and the two have independent control planes.
  • the characteristic is that the signaling, addressing, and routing establishment at the optical transmission level are different from the protocols used for the signaling, addressing, and routing establishment required by the switching layer of the services provided by the upper layer (mainly the IP/MPLS network).
  • the necessary information exchange between the two is performed through the User Network Interface (UNI) of the optical network, and the internal information of the network is not exchanged between the edge client layer device and the core network layer device (for example, the optical network topology) Information, etc.), implement independent routing.
  • UNI User Network Interface
  • the internal information of the network is not exchanged between the edge client layer device and the core network layer device (for example, the optical network topology) Information, etc.), implement independent routing.
  • the solution has better networking flexibility and can effectively utilize existing resources.
  • the IP router cannot obtain the resource information inside the optical core network, it cannot implement the calculation of the entire network traffic engineering required by the ' ⁇ + light' technology.
  • Separate control planes cause duplication of functions, so that service-level routing cannot effectively utilize the topological resources of the optical transport layer, resulting in waste of resources, and the establishment of an optimal LSP for the entire network end-to-end.
  • FIG. 2 is a schematic structural diagram of a peer-to-peer networking system of an optical internet network in the prior art, where 21 and 22 are IP/MPLS networks, and 20 is an optical core network. From the control point of view, the protocols used in the IP/MPLS network and the optical core network for addressing, signaling, and routing establishment are all based on GMPLS, that is, in the IP/MPLS network 21 and the optical core network. Between 20 and 22 IP/MPLS networks All end-to-end optical paths are established based on GMPLS signaling. 201 is the LSP calculated by the entire network TE. It is characterized in that the control intelligence of the optical transport layer is transferred to the IP layer, and the end-to-end control is implemented by the IP layer. At this point, the optical transport network and the IP network form an integrated network, and the unified control plane maintains a single topology. The optical switch and the IP router can freely exchange all information and run the same routing and signaling protocol to achieve integration. Management and traffic engineering.
  • the peer-to-peer networking solution can well complete the TE path calculation of the entire network, and can utilize the topology and resource information of the IP/MPLS network and the optical core network, it requires the routers of the entire network to support the GMPLS protocol. Peer relationship between nodes. This kind of networking scheme has a very large scope for the changes of the existing network, and it is difficult to implement. In addition, operators of optical core networks are often reluctant to disclose their internal network information (such as topology information) to customers. They want optical core networks to be as stable as possible, while peer-to-peer models make the topology and resources of optical core networks. Information is learned by all routers in the IP/MPLS network.
  • the present invention mainly provides a method for establishing a switching path in an optical Internet, and establishing an exchange path between an IP/MPLS network domain and a GMPLS network domain, especially an optical core network, in a case where only minor changes are made to the network, The need for MPLS domain and GMPLS domain convergence.
  • the present invention also provides a network device for establishing a switching path across an MPLS network domain and a GMPLS network domain to meet the requirements of MPLS network domain and GMPLS network domain convergence.
  • the present invention also provides an optical internet system in which a switching path is established across an MPLS network domain and a GMPLS network domain, with only minor changes to the network, to meet the needs of the fusion of the MPLS network domain and the GMPLS domain domain.
  • the method for establishing a switching path in an optical Internet includes the following steps: establishing a first segment switching path in a first metropolitan area network supporting MPLS technology;
  • the network device configured to establish a switching path, including a processor, a memory, and a plurality of ports, in the MPLS network domain and the GMPLS network domain, and further includes:
  • MPLS-TE functional interface for connecting to a domain based on MPLS technology
  • GMPLS function interface used to connect to the GMPLS technology-based domain.
  • the optical interconnection system provided by the embodiment of the present invention includes a first metropolitan area network supporting MPLS technology and an optical core network supporting GMPLS technology, where the first metropolitan area network is connected to the optical core network through a network device, where
  • the network equipment includes:
  • An MPLS-TE function interface configured to connect to the first metropolitan area network
  • a GMPLS function interface is configured to connect to the optical core network.
  • the network-wide traffic engineering TE across the MPLS network domain and the GMPLS network domain can be implemented under the condition that only a few network devices are upgraded. Establishing the end-to-end optimal switching path of the entire network, and ensuring that the GMPLS domain hides the topology and resource information of the network from the IP/MPLS network, and satisfies some of the GMPLS domains, especially the optical network operators. The need to hide resources.
  • FIG. 1 is a schematic structural diagram of an overlapping networking system of an optical internet network in the prior art
  • FIG. 2 is a schematic structural diagram of a peer-to-peer networking system of an optical internet network in the prior art
  • FIG. 3 is a flowchart of establishing an LSP in an optical internet according to an embodiment of the present invention.
  • FIG. 4 is a structural diagram of a backbone router according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of an optical internet system according to an embodiment of the present invention.
  • the embodiment of the invention provides an optical internet system model.
  • the metropolitan area network is connected to the optical core network serving as the backbone network through the backbone router.
  • the backbone router supports both the MPLS-TE function and the GMPLS function, and can determine the creation of the carrier network.
  • the LSP requests information, and when the upstream node and the downstream node are in different network segments respectively, the LSP creation process initiated by the upstream node is terminated by the egress node to form a segment LSP.
  • the backbone router is also capable of bonding the LSPs connected to the metropolitan area network side and the optical core network side to implement the convergence of the IP/MPLS network and the optical core network.
  • the method for establishing an LSP in the optical Internet uses the bone-throw router as a demarcation point to establish an optimal LSP for each network segment through the TE, wherein the carrier network segment is based on the MPLS that supports traffic engineering.
  • Optimum LSP establishes an optimal LSP based on GMPLS in the optical core network segment; the backbone router glues the LSPs connected to the metropolitan area network side and the optical core network side to implement the fusion of the IP/MPLS network node and the optical core network.
  • FIG. 3 is a flowchart of a method for establishing a switching path in an optical internet according to an embodiment of the present invention.
  • the method includes the following steps: Step 301: Establish a segment optimal optimal label switching path LSP1 of the network segment between the first metropolitan area network and the ingress backbone router located at the edge of the optical core network (serving the backbone network).
  • the first metropolitan area network is a network supporting MPLS technology
  • the interface of the ingress backbone router on the metropolitan area side is an interface supporting MPLS technology.
  • the step specifically includes: initiating a label allocation request for establishing an LSP by the label edge router LER1 located in the first metropolitan area network, where the request message includes a destination address, an input/output port, and the destination address of the request is a second city.
  • the label edge router LER2 of the domain network after receiving the label allocation request, the ingress backbone router performs node information judgment; the ingress backbone router finds that its downstream node is located in the optical core network, and decides to act as an egress node of the label allocation request;
  • the MPLS technology supporting traffic engineering establishes a segment-optimized label switching path LSP1 between the first metropolitan area network and the ingress backbone router.
  • Step 302 Establish a segment-optimized label switching path LSP2 between the ingress backbone router and the egress backbone router connected to the optical core network.
  • the ingress backbone router supports The interface of the GMPLS technology sends a label allocation request for establishing an LSP, and the egress backbone router receives the above request from an interface supporting the GMPLS technology.
  • the LSP2 establishment process of the network segment includes: The ingress backbone router does not forward the label allocation request sent by the LER1, and stores the label switching path LSP1 established between the LER1 and the LER1, and generates a label for establishing the LSP with the LER2 as the destination address.
  • the egress backbone router After receiving the above request, the egress backbone router determines that its downstream node is located in the second metropolitan area network; the egress backbone router decides to act as an egress node for the label allocation request on the optical core network; based on GMPLS technology in this network
  • the segment establishes a segment-optimized label switching path LSP2.
  • the foregoing process is similar to the first step. The difference is that the content of the label request message changes, mainly in the label allocation request message, such as the LSP type, the payload type, and the link protection mode.
  • Step 303 Establish a segment optimal optimal label switching path LSP3 of the network segment between the egress backbone router located at the edge of the optical core network and the second metropolitan area network.
  • the process of establishing the label switching path includes: the exit backbone router terminates the entrance bone After the label distribution request sent by the dry router and the label switching path LSP2 are established and stored by the ingress backbone router, a label allocation request for establishing an LSP with the LER2 as the destination address is generated; after receiving the label allocation request, the LER2 determines that it is The egress node; LER2 establishes a segment-optimized label switching path LSP3 of the network segment based on the MPLS technology supporting traffic engineering between itself and the egress backbone router.
  • the LSP3 and the LSP3 are bound to become a new label switching path LSP23, and the label switching path is sent to the egress backbone router for forwarding.
  • Floor After the LSP3 is successfully established, the LSP3 and the LSP3 are bound to become a new label switching path LSP23, and the label switching path is sent to the egress backbone router for forwarding. Floor.
  • the bonding process of the egress backbone router includes: the egress backbone router receives the label allocated by the LER2 of the second metropolitan area network, and determines that the LSP3 has been successfully established; the egress backbone router searches the local tag management library for the same purpose as the LSP3. In the embodiment, the egress backbone router finds the LSP2; the egress backbone router glues the LSP2 and the LSP3 into one of the tag management tables to form a new one.
  • the label switching path LSP23 is delivered to the forwarding layer of the egress backbone router.
  • Step 305 After the LSP2 and the LSP3 of the egress backbone router form an ingress backbone router to the label switching path LSP23 of the second metropolitan area network, generate an LSP notification message, and notify the ingress backbone router to bind LSP2 and LSP3 to form a new label switching path. LSP23.
  • the content of the LSP notification message mainly includes the destination address of the new label switching path LSP23, the input/output port information of the ingress backbone router at the egress backbone router, and the input label of the LSP2 in the egress backbone router, to uniquely identify the sticky The combined label switching path LSP23.
  • Step 306 The ingress backbone router receives the foregoing LSP notification message, and binds LSP1 and LSP23 to form a label switching path LSP13 of the first metropolitan area network to the second metropolitan area network.
  • the bonding process of the ingress backbone router includes: the ingress backbone router receives a message that the LSP 23 sent by the egress backbone router is successfully established; the ingress backbone router searches the local tag management table for the destination address with the LSP 23, and the output label thereof is In the present embodiment, the ingress backbone router finds LSP1; the ingress backbone router glues LSP23 and LSP1 into one of the label management tables to form the first metropolitan area network optical core network. The label switching path LSP13 of the second metropolitan area network is delivered to the forwarding layer of the ingress backbone router.
  • Step 307 After the ingress gateway routers LSP23 and LSP1 form the first metropolitan area network optical core network to the label switching path LSP13 of the second metropolitan area network, an LSP notification message is generated to notify the first metropolitan area network that the LSP13 has been generated.
  • the content of the LSP notification message mainly includes the destination address of the new label switching path LSP13, the input/output port of LER1 at the ingress backbone router, and the input label of the LSP1 at the ingress backbone router, to uniquely identify the glued label.
  • Label switching path LSP13 the optimal LSP between the first metropolitan area network and the second metropolitan area network is successfully established.
  • FIG. 4 is a structural diagram of a backbone router, that is, a network device according to an embodiment of the present invention, including:
  • the backbone router includes: an MPLS-TE function interface 41 and a GMPLS function interface 42.
  • the MPLS-TE function interface 41 is used to connect to the MPLS-based network domain;
  • the GMPLS function interface 42 is used to connect to the GMPLS-based network domain.
  • the node information judging module 401 and the switching path request message termination module 402 are configured to obtain the switching path received by the MPLS-TE function interface 41 and/or the GMPLS function interface 42.
  • the switching path request message termination module 402 terminates the request.
  • the backbone router is further provided with a switching path bonding module 404 for bonding two segment switching paths located on the metropolitan area network side and the optical core network side.
  • the end-to-end optimal LSP of the entire network TE is further provided with a switching path bonding module 404 for bonding two segment switching paths located on the metropolitan area network side and the optical core network side.
  • the backbone router further includes: a switching path request message generating module 403 and a switching path notification message generating module 405.
  • the switching path request message generating module 403 uses the network device as a starting node to generate a new switching path request message according to the destination address of the segment switching path. And sent out through the GMPLS function interface 42.
  • the switching path bonding module 404 bonds the segment switching paths located on the metropolitan area network side and the optical core network side of the network device
  • the switching path notification message generating module 405 generates an exchange path notification message and passes the MPLS-TE function interface 41. The upstream node is notified that the segment switching path of the adjacent network segment has been successfully established.
  • the node router After receiving the label allocation request message, the node router determines whether the downstream node and the upstream node are in the same network segment. If the downstream node and the upstream node are in the same network segment, the bone router continues to pass the upstream node to the downstream node. A tag allocation request sent;
  • the switching path request message termination module of the backbone router terminates the label allocation request sent by the upstream node, and uses itself as an egress node to establish a label switching path with the upstream node; then the backbone router
  • the exchange path request message generation module generates a new label allocation request and transmits it to the downstream node.
  • the switching path bonding module glues the segment label switching path of different network segments connected to form an end-to-end LSP, which is then generated by the switching path notification message generating module.
  • the path notification message is exchanged, and the upstream node is notified that the end-to-end LSP has been built.
  • FIG. 5 it is a structural diagram of an optical internet system according to an embodiment of the present invention.
  • the system includes: a metropolitan area network 51, 52 supporting MPLS technology, and an optical core network 50 supporting GMPLS technology.
  • the first metropolitan area network 51 is connected to the optical core network 50 through the ingress backbone router 501, and the optical core network 50 is passed through the egress backbone router.
  • the 502 is connected to the second metropolitan area network 52, and the ingress backbone router 501 and the egress backbone router 502 have the same structure, including: an MPLS-TE functional interface connecting the metropolitan area network and a GMPLS functional interface connecting the core network.
  • the backbone router can establish a segment label switching path of different network segments when the downstream node and the upstream node are respectively located in different types of network segments, and can be bonded to the metropolitan area network.
  • the segment label switching path LSP on the side and the optical core network side forms a cross-network label switching path.
  • the backbone router provided by the embodiment of the present invention can learn the topology of the entire network.
  • other routers in the metropolitan area network such as LER1 and LER2
  • routing devices in the optical core network such as Optical Cross Connect or OXC, can only be viewed.
  • OXC Optical Cross Connect
  • LER1 initiates a label allocation request with the LER2 as the destination address to the ingress backbone router.
  • the ingress backbone router receives the above label allocation request, and no longer sends the label allocation request to the optical cross-connector OXC in the optical core network, but uses itself as an egress node of the MPLS network, and LERl establishes a segment label switching path LSP1. Then, the ingress backbone router re-initiates the label allocation request in the optical core network with itself as the starting node.
  • the egress backbone router takes the same steps as the ingress backbone router to establish the segment label switching path LSP2 of the optical core network with the ingress backbone router. Then, the egress backbone router re-initiates a label allocation request with the LER as the destination address in the second metropolitan area network.
  • the LER2 and the egress backbone router establish a segmentation label switching path LSP3 of the second metropolitan area network according to the existing MPLS technology.
  • the egress backbone router receives the label allocated by the LER2, and determines that the LSP3 is successfully established.
  • the LSP2 and the LSP3 form a label switching path LSP23 across the optical core network and the second metropolitan area network, and send a notification message that the LSP23 is successfully established to the ingress backbone router.
  • the ingress LSP1 and the LSP23 form a label switching path LSP13 that connects the LER1 and the LER2 across the optical core network, and sends a notification message that the LSP13 is successfully established to the LER1.
  • LER1 After receiving the notification message from the ingress backbone router, LER1 transmits data to LER2.
  • the method and system provided by the embodiments of the present invention support the MPLS function and the GMPLS function by upgrading the backbone router at the edge of the optical core network, respectively establishing an optimal label path LSP for each network segment, and bonding the LSPs to each segment.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

La présente invention concerne un procédé permettant d'établir une voie de commutation dans un réseau Internet optique. Ce procédé consiste à établir la première voie de commutation de sous-paragraphe dans le premier MAN dont le support est assuré par une technologie MPLS, à établir la seconde voie de commutation de sous-paragraphe dans le réseau central optique dont le support est assuré par une technologie GMPLS, à réunir la première voie de commutation de sous-paragraphe et la seconde voie de commutation de sous-paragraphe et à former la voie de commutation de réseau central de premier MAN. Cette invention concerne également un système Internet optique et un équipement de réseau. Selon cette invention, la voie de commutation optimale de bout en bout par TE sur les réseaux à domaine MPLS et GMPLS est établie et il n'est pas nécessaire d'effectuer des modifications à grande échelle pour améliorer difficilement tous les routeurs du réseau afin qu'ils supportent GMPLS dans le réseau.
PCT/CN2007/000997 2006-07-19 2007-03-28 Procédé, équipement de réseau et système permettant d'établir une voie de commutation dans un réseau internet optique WO2008011771A1 (fr)

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