Label update method, flow sending method and label switching router

Abstract

The invention discloses a label update method, a flow sending method and a label switching router. According to the label update method, the flow sending method and the label switching router, when a first LSR is adjacent equipment of a standby path, arriving an objective LSR, in a second LSR and the second LSR is adjacent equipment of a main path, arriving an objective LSR, in the first LSR, the first LSR generates a second label representing itself, the second label is used for replacing a first label in an LSP forwarding entry corresponding to standby paths, arriving the objective LSR, in the first LSR, and the first label in an LSP forwarding entry corresponding to the main path, arriving the objective LSR, in the first LSR is maintained unchanged; the first LSR sends the second label to the second LSR to inform the second LSR to use the second label to replace the first label in the LSP forwarding entry corresponding to the standby path, arriving the objective LSR, in the second LSR; the first label is a label which is distributed by an LDP and used for identifying the first LSR. The invention further discloses a flow sending method and the LSR.

Description

technical field [0001] The invention relates to the technical field of MPLS, in particular to a label updating method, a traffic sending method and a label switching router. Background technique [0002] Multiprotocol Label Switching (MPLS, Multiprotocol Label Switching) is a backbone network technology widely used at present. In an MPLS network, devices forward packets based on short and fixed-length labels, which saves the cumbersome process of searching the IP routing table and provides a high-speed and efficient way for data transmission in the backbone network. MPLS supports multi-layer labels and connection-oriented features, making it widely used in virtual private network (VPN, Virtual Private Network) and quality of service (QoS, Quality of Service); and because of its good scalability, it makes It is possible to provide customers with various services in a unified MPLS / IP basic network architecture, making MPLS increasingly the basis for large-scale network applic...

AI Technical Summary

Problems solved by technology

from figure 2 From the LSP forwarding path shown, it can be seen that LSR C is an adjacent device on the backup path of LSR A, and LSR A is an adjacent device on the primary path of LSR C; in this case, if LSR A and LSR If the link between B fails, the original traffic from LSR A to LSR B will be switched to LSR A’s backup path LSR A→LSR C→LSR B. However, when the traffic reaches LSR C, because LSR C reaches LSR The link LSR C → LSR A of the main path of B is normal, so LSR C will return the traffic to LSR A through the link LSR C → LSR A, thus forming a loop, and the traffic cannot be successfully sent to the destination. Generate a lot of traffic packet loss

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