Method and system for establishing label switched path and network node

A label switching path and label technology, applied in the field of communication, can solve the problem of increasing network processing data packet processing requirements, and achieve the effect of avoiding data packet disorder and satisfying management and maintenance

Active Publication Date: 2010-06-16
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this solution is to first establish an ECMP path, query the IP protocol field or label stack of the data packet when forwarding, and apply the ECMP algorithm instead of taking the ECMP path. Packet Processing Requirements

Method used

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  • Method and system for establishing label switched path and network node
  • Method and system for establishing label switched path and network node
  • Method and system for establishing label switched path and network node

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] This embodiment illustrates the process of establishing an LSP by LDP in DoD mode. In the DoD mode, since the upstream LSR needs to request label mapping from the downstream LSR first, the downstream LSR sends the label mapping packet to the upstream LSR only after receiving the label request packet from the upstream LSR. Therefore, in the DoD mode, the initiation of the ECMP command or request is mainly completed by the ingress edge LSR (ingress) node, and the initiation method can be realized by configuring the ingress node through the network management.

[0138] figure 2 In the DoD mode provided in this embodiment, the establishment of the ECMP path topology diagram is avoided. like figure 2 As shown, assume that FEC5.5.5.5 is a specific FEC that does not need to establish ECMP. Configure the NO-ECMP (that is, do not establish ECMP) command about FEC5.5.5.5 on the ingress node, then the ingress node queries the routing table to determine the route that the FEC ...

Embodiment 2

[0157] In this embodiment, the process of establishing an LSP by LDP is described in DU mode. In the DU mode, the upstream node does not need to request a label from the downstream. After the LDP session is successfully established, the downstream LSR actively sends a label mapping message to the upstream. Therefore, in the DU mode, the command or request of whether to establish ECMP is initiated by the egress node, and the initiation method can be configured on the egress node through the network management.

[0158] For the DU mode, when the independent (independent) mode or the ordered (order) mode is adopted, the two differ in when the downstream LSR feeds back the label mapping message to the upstream LSR. In the DU order mode, the intermediate node receives After receiving the label mapping message sent by the downstream node, the label mapping message is sent to the upstream node; in the DU independent mode, the intermediate node may send the label mapping message to th...

Embodiment 3

[0175] This embodiment illustrates the process of establishing an LSP by LDP in an independent manner in the DU mode. In the DU mode, the upstream node does not need to request a label from the downstream. After the LDP session is successfully established, the downstream LSR actively sends a label mapping message to the upstream.

[0176] Image 6 In the DU independent mode provided for this embodiment, the establishment of the ECMP path topology diagram is avoided. like Image 6 As shown, let FEC5.5.5.9 be a specific FEC that does not need to establish ECMP. R1, R2, R3, R4, and R5 are used to identify five routers respectively; 1, 2, 3, and 4 are used to indicate the sending order of label mapping packets; 1024, 1025, 1026, and 1027 are used to indicate that label mapping packets are up The label value sent by the traveler; 5.5.5.9 identifies the egress router for FEC5.5.5.9, and can also indicate the destination address prefix of FEC5.5.5.9.

[0177] In this embodiment, ...

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Abstract

The invention discloses a method and a system for establishing a label switched path and a label switching router, and belongs to the field of communication. The method comprises the following steps: sending a label request message which carries attribute sign information of an equivalent multi-path router of an forwarding equivalence class to a downstream node by a node on the edge of an inlet, sending the label request message to a next hop node according to the attribute sign information by the downstream node receiving the label request message; and performing label mapping according to a path of the label request message by the node receiving the label request message, performing label binding for the forwarding equivalence class, and establishing the label switched path. The method avoids establishing the equivalent multi-path router for the forwarding equivalence class with a special requirement through the introduction of the attribute sign information for establishing the equivalent multi-path router or not in the process of establishing the label switched path, thereby contributing to network management and maintenance.

Description

technical field [0001] The invention relates to the communication field, in particular to a method, system and network node for establishing a label switching path. Background technique [0002] Multi-Protocol Label Switching (MPLS, Multi-Protocol Label Switching) belongs to the third-generation network architecture and is a new generation IP high-speed backbone network switching standard, proposed by the Internet Engineering Task Force (IETF, Internet Engineering Task Force). MPLS integrates IP routing technology and Layer 2 switching, adds the connection-oriented attribute of MPLS to the connectionless IP network, transplants the connectionless-oriented IP service to the connection-oriented label switching service, and realizes the routing selection layer Separated from the data forwarding layer. [0003] In the MPLS network, at the ingress Label Switch Router (LSR, Label Switch Router), the packets entering the network are divided into forwarding equivalence classes (FEC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L29/06H04L45/02H04L45/50
CPCH04L45/507H04L45/02H04L45/03
Inventor 曹玮国辛纯
Owner HUAWEI TECH CO LTD
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