A method and device for vpws message passing through three-layer ip network

Abstract

A method and device for VPWS messages to traverse a three-layer IP network, consisting of a control plane and a forwarding plane, with a multi-core CPU as the core of the control plane, running multiple control plane protocols such as routing protocols, LDP protocols, GRE protocols, and ARP protocols, and The various table items needed to generate the forwarding plane to process data packets include routing tables, MPLS label tables, GRE session tables, and ARP tables; the forwarding plane is implemented by switching chips and FPGAs, which cooperate with each other to process VPWS data packets, and switching chips Responsible for receiving data packets, after corresponding processing, send the data packets to the FPGA, FPGA processes the data packets and then sends them to the switch chip, and the switch chip performs final processing on the data packets and sends them out; the present invention uses the CPU as the core of the control plane to forward Various forwarding entries related to VPWS and GRE are written on the surface, and the switch chip and FPGA are used as the forwarding plane to cooperate with each other to process VPWS packets through the IP network, which can realize the wire-speed forwarding of VPWS over GRE and ensure the forwarding performance of the device port.

Description

technical field [0001] The invention relates to the technical field of computer network data communication, in particular to a device and method for VPWS messages to traverse a three-layer IP network. Background technique [0002] VPWS (Virtual Private Wire Service), which refers to the infrastructure built on the mpls network, provides high-speed layer-2 transparent transmission between a pair of ports of two routers, and can transfer the original Ethernet packets of the local PE device Transparently transmitted to the remote PE device, it is a layer 2 VPN protocol. [0003] GRE (Generic Routing Encapsulation) is the general routing encapsulation protocol, which is the third layer tunneling protocol of VPN, that is, a technology called Tunnel (tunnel) is adopted between the protocol layers, and it is for some network layer protocols (such as IP, IPX, MPLS, etc.) datagrams are encapsulated so that these encapsulated datagrams can be transmitted in another network layer prot...

AI Technical Summary

Problems solved by technology

For this PW (Pseudo-Wire) over GRE data packet processing, the current mainstream switching chips in the industry, such as Broadcom or Marvel, can only perform PW label encapsulation or IP encapsulation on user packets, and cannot perform PW on user packets. After label encapsulation, IP encapsulation is performed again. Similarly, the switch chip cannot complete the action of stripping off the IP header and then stripping the PW label again for the PW over GRE data packet; for this kind of PW over GRE data packet processing, if Use CPU soft forwarding to process, although the code is flexible, but the forwarding ability is too poor, and the port cannot line speed

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