Packet transmission method and device in multi-protocol label switching network

Abstract

The invention provides a packet transmission method and a device in multi-protocol label switching network (MPLS), wherein the method comprises the following steps: a PW label is distributed on a virtual connection (PW) head node, wherein the same PW label is distributed to mutual active-standby PWs; the PW head node stores the PW label in a sending label transmitting table entry corresponding toVPN bound by the PW; a PW tail node takes the PW label and the corresponding relation between the PW label and the VPN bound by the PW as a receiving label transmitting table and stores the receivinglabel transmitting table in a receiving label transmitting table corresponding to a tunnel loading the PW; after the PW head node receives a packet, the PW label in the sending label transmitting table entry corresponding to the VPN of the packet is searched; the PW label is added on the packet, and is sent to the PW tail node after being packaged by the current usable tunnel. The invention can conveniently realize flow switching and increase switching speed.

Description

technical field [0001] The invention relates to network communication technology, in particular to a packet transmission method and device in a multi-protocol label (MPLS) network. Background technique [0002] Multi-protocol label switching (MPLS) encapsulates network layer packets with short and fixed-length labels, and forwards them according to labels, avoiding complicated route lookup and forwarding. IP-based virtual private network (VPN) services can be easily implemented through MPLS technology, and can meet the needs of VPN scalability and management. [0003] In the MPLS technology, virtual connection (PW) technology can be used, that is, the operator's edge (PE) routers are connected to each other through PW, such as figure 1 As shown, taking the Virtual Private Wire (VPWS) architecture as an example, the PW is carried by a tunnel at the lower layer. The tunnel can be an MPLS LSP tunnel or a Generic Routing Encapsulation (GRE) tunnel. Thousands of entries. The l...

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Problems solved by technology

[0007] However, in the above two methods, since the sending labels corresponding to the active PW and the standby PW are not the same, it is necessary to store two sets of sending label forwarding tables at the forwarding level, and re-deliver the switched standby PW when the sending is switched. The sending tag forwarding table of the PW is obviously more troublesome to implement, and it also affects the switching speed

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