Label information transmission method and device

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....

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

Images