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Label information transmission method and device

A technology of tag information and transmission method, which is applied in transmission systems, digital transmission systems, electrical components, etc., can solve the problems of wasting transmission resources, BGPUpdate message waste, discarding, etc., to reduce the number of transmissions, reduce equipment burden and network burden Effect

Active Publication Date: 2013-07-17
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the above implementation, the PE device needs to notify the label information of all local VPN instances to the peer PE device through the BGP Update message, which will cause a waste of BGP Update messages; figure 1 As shown, all VPN instances on PE1 are VPN1 (Export route target is 100:1) and VPN2 (Export route target is 200:1), and the VPN instance on PE2 is VPN1 (Import route target is 100:1); based on this, like figure 2 As shown, PE1 needs to send the label information of the VPN1 instance and the label information of the VPN2 instance to PE2 respectively through two BGP Update packets, and the RT attributes carried in the two BGP Update packets are 100:1 and 200 respectively: 1. After receiving the two BGP Update packets, PE2 will accept the BGP Update packet with the RT attribute of 100:1 by comparing the Import route target (100:1) with the RT attribute carried in the BGP Update packet. And the BGP Update message whose RT attribute is 200:1 will be discarded. Obviously, the transmission of the BGP Update message whose RT attribute is 200:1 wastes transmission resources

Method used

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  • Label information transmission method and device

Examples

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Embodiment Construction

[0041] Aiming at the problems existing in the prior art, the embodiment of the present invention provides a label information transmission method, which is applied to an MPLS L2VPN network including a first PE device and a second PE device that are BGP neighbors to each other (the MPLS L2VPN network Specifically, it can be an MPLS L2VPN network in the Kompella mode), with figure 1 The application scenario shown is an example. The first PE device is PE1, and the second PE device is PE2; or, the first PE device is PE2, and the second PE device is PE1; The device is PE2 as an example for illustration.

[0042] Based on the above application scenarios, such as image 3 As shown, the method includes the following steps:

[0043] Step 301, after the second PE device successfully establishes a BGP neighbor relationship with the first PE device (that is, the BGP neighbor state machine is in the ESTABLISHED (established) state), the second PE device collects the Import RT attributes ...

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PUM

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Abstract

The invention discloses a label information transmission method and device. The label information transmission method includes that a first PE (Provider Edge) device receives Import RT (Route Target) attribute information from a second PE device; the first PE device confirms VPN (Virtual Private Network) cases which are corresponding to the Import RT attribute information in all VPN cases; and the first PE device sends label information of the VPN cases which are corresponding to the Import RT attribute information to the second PE device through a BGP (Border Gateway Protocol) Update message. The label information transmission method and system has the advantages of avoiding transmitting unnecessary BGP Update messages and reducing the transmission number of the BGP Update messages.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and equipment for transmitting label information. Background technique [0002] MPLS (Multiprotocol Label Switching, Multiprotocol Label Switching) L2VPN (Layer 2Virtual Private Network, Layer 2 Virtual Private Network) is used to establish Layer 2 connections between different user nodes; based on MPLS L2VPN technology, operators The backbone network transparently transmits Layer 2 data of different data link layers, so that data link layer services can be transmitted across the MPLS or IP backbone network. Among them, MPLS L2VPN includes VPWS (Virtual Private Wire Service, Virtual Private Office Line Service) and VPLS (Virtual Private LAN Service, Virtual Private LAN Service). [0003] VPWS is a point-to-point MPLS L2VPN service provided in the public network. From the user's point of view, the MPLS or IP backbone network is a Layer 2 switching network....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/723H04L12/947H04L45/50
Inventor 田钧宇
Owner NEW H3C TECH CO LTD
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