distribution method, asbr, pe and distribution system

Abstract

The invention provides a VPN route label distribution method, ASBR, PE and a distribution system, the method comprising: receiving a VPN route update message; judging whether to assign a label for a new VPN route according to the VPN route update message; if necessary, assigning a new VPN route Label. Through the implementation of the present invention, after receiving the VPN route update message, it is first judged whether a label needs to be allocated for the new VPN route, and only when necessary, the label is allocated, which is different from the prior art after receiving the VPN route update message. Compared with assigning labels for VPN routes, the number of labels for VPN routes can be reduced, which relieves the pressure on ASBRs.

Description

technical field [0001] The invention relates to the field of network communication, in particular to a virtual private network VPN routing label distribution method, ASBR, PE and a distribution system. Background technique [0002] The private private network built using the public network is called a virtual private network (VPN, Virtual Private Network). Sites belonging to a VPN may be connected to different PEs. In order to ensure the connectivity of the VPN, we must exchange VPNs between PEs. routing information. In networking applications, multiple Sites of user VPNs may be connected to different AS (Application Server, Application Server) domains of multiple ISPs (Internet Service Providers, Internet Service Providers). This application method is called cross-domain VPN. [0003] Cross-domain VPN to solve the problem that LSP (Label Switched Path, Label Switched Path) cannot cross domains, the key lies in the configuration of ASBR (Autonomous System Boundy Router, Au...

AI Technical Summary

Problems solved by technology

[0004] In the MP-EBGP network, all the private network routes of the local domain and other domains must be maintained on the ASBR, and the ASBR must assign a label to each VPNv4 route. As the number of labels on ASBR increases, the number of labels on ASBR can easily exceed the scale, and forwarding table entries will occupy a large amount of memory. Adding or deleting VPNv4 routes needs to be broadcast to each forwarding board, which increases the burden on the ASBR system.

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