Method, label switching router and system for generating forwarding-table item information

Abstract

The embodiment of the invention discloses a method, a label switching router and a system for generating forwarding-table item information. The method for generating the forwarding-table item information comprises that: a first label switching router establishes session with a second label switching router to receive label mapping information sent by the second label switching router; the first label switching router queries an adjacent body preset locally corresponding to the session receiving the label mapping information; and the first label switching router acquires a local interface indexin the adjacent body and an interface address of the second label switching router to generate an export interface index and a next-hop address in the forwarding-table item. The method can generate the export interface index and the next-hop address in the forwarding-table item flexibly as required under the trigger of the mapping information sent by any label switching router, without dependingon routing information.

Description

technical field [0001] The invention relates to communication technology, in particular to a method for generating forwarding entry information, a label switching router and a system. Background technique [0002] LDP (Label Distribution Protocol, label distribution protocol) is the most important protocol in MPLS (Multi-Protocol Label Switching, multi-protocol label switching), responsible for label binding and LSP (Label Switch path, label switching path) establishment and maintenance , mainly divided into the following three stages: [0003] 1. Use the neighbor discovery message of the LDP protocol to discover the existence of the peer; [0004] The LDP protocol has three types of messages: neighbor discovery messages, session-related messages, and signaling messages. The neighbor discovery messages use hello messages to discover the existence of LDP neighbors. The LSR (LabelSwitching Router, Label Switching Router) in the network periodically sends a Hello message in m...

AI Technical Summary

Problems solved by technology

[0020] In the P2P scenario, because the establishment of LSP depends on unicast routing, and the optimal downstream LSR is saved in the routing table; therefore, for the mapping message sent by the non-routing LSR, the LSR cannot generate the output information in the forwarding table entry. Interface index and next hop address

[0021] In the P2MP scenario, the FEC in the mapping message sent by the downstream LSR to the upstream LSR corresponds to the root node (the ingress node of the packet data flow), so the upstream LSR cannot use the unicast routing table in the P2P scenario to obtain the outgoing interface index and the method of the next hop address to obtain the outbound interface index and the next hop address

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