Method and apparatus for processing direct connected network route

Abstract

The invention relates to a straight connected network segment routing processing method and device in the technical field of MPLS VPN (multiprotocol label switch virtual private network), comprising: a receiving end receives message and generates ILM+FIB according to link information; as determining the message is a message in the straight connected network segment, adopts two-stage indexing method according to the ILM+FIB to transmit the message to destination address. And the invention implements fast and simple and convenient transmission of VPN messages in the straight connected network segment.

Description

technical field [0001] The invention relates to the technical field of MPLS (Multiprotocol Label Switching) VPN (Virtual Private Network), in particular to a routing processing method and device for directly connected network segments. Background technique [0002] BGP (Border Gateway Protocol) / MPLS VPN is a VPN solution based on RFC2547bis. The BGP / MPLS VPN allows service providers to use their own IP backbone network to provide VPN services to customers. It uses MP-BGP (Multiprotocol Extended Border Gateway Protocol) to exchange VPN routing information in the provider's backbone network, and forwards VPN traffic from one site to another via MPLS. Such as figure 1 As shown, the provider provides VPN transmission between Site1 and Site2, VPN transmission between Site3 and Site4, and IP isolation is implemented between the two VPNs. Shared LSP (Label Switching Path) tunnel, and has rich VPN policies. [0003] In the above transmission scheme, from the data forwarding plan...

AI Technical Summary

Problems solved by technology

[0007] 1) For devices that separate the control plane from the forwarding plane, this kind of forwarding brings serious efficiency problems and directly affects the forwarding rate of users;

[0008] 2) For a distributed device that realizes the independent distribution of the ingress interface board and the egress interface board, the ingress interface board connected to the MPLS side and the egress interface board connected to the CE side are designed to have different functions, and the ingress interface board often does not Save the user's private network routing information, so there are certain difficulties in the implementation of this solution

[0011] (1) Due to the need to assign labels for host routes, when the host needs to process many events, especially when the PE device is directly connected to the second-layer device, it will consume a lot of labels, which is equivalent to reducing the specifications supported by the device to a certain extent. For the local PE, the specification for supporting ILM entries is reduced, and for the remote PE, the specification for the number of supported private network routes is reduced;

[0012] (2) Since the host route is included in the private network route that BGP needs to publish, the processing of the BGP protocol is increased, and the processing efficiency will be affected, especially when the VPN topology changes and needs to be refreshed, it will bring a processing bottleneck

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