MPLS-based method and device for line speed mutual forwarding of two-layer VPN and three-layer VPN

Abstract

The invention discloses an MPLS-based method for line speed mutual forwarding of a two-layer VPN and a three-layer VPN. The MPLS-based method for line speed mutual forwarding of the two-layer VPN and the three-layer VPN comprises the following steps that a PE device conducts message finalization on a received L2VPN message, a VC label is expanded to be associated with VRF, mutual forwarding of the L2VPN message and an L3VPN message is achieved, routing lookup is conducted directly, and the packaged L3VPN message is forwarded. The invention further discloses an MPLS-based device for line speed mutual forwarding of the two-layer VPN and the three-layer VPN. The device comprises an L2VPN message finalization unit, a L2VPN / L3VPN associated unit and an L3VPN message forwarding unit. According to the MPLS-based method and device for line speed mutual forwarding of the two-layer VPN and the three-layer VPN, a route needs to be looked up only for one time, the finalization of the L2VPN message can be achieved, and the L2VPN message can be packaged to be the L3VPN message and is forwarded into an L3VPN network, so that logic of message forwarding is optimized, the message can be looked up only for one time and has no need to be returned and processed, occupied bandwidth amount is small, and the fact that line speed mutual forwarding of the two-layer VPN and the three-layer VPN is conducted on the PE device is achieved.

Description

technical field [0001] The invention relates to the field of network communication, in particular to an MPLS-based method and device for two-layer and three-layer VPN wire-speed mutual conversion. Background technique [0002] The virtual private local area network includes multiple provider edge routers (Provider Edge, PE) and user edge routers (Customer Edge, CE) interconnected with these PE devices. ) to transmit data frames, and a certain access link (Attachment Circuit, AC) is used to transmit data frames between the PE equipment and each CE equipment. [0003] With the development of network technology, especially the rise of MPLS VPN technology, the core equipment in the network needs to have the ability to exchange data between the L2VPN network and the L3VPN network. On a network processor (such as an ASIC or NP), see figure 1 as shown, figure 1 It is a schematic diagram of the existing L2VPN→L3VPN mutual transfer network, in which PE1-PE2-PE3 constitutes an L2VP...

AI Technical Summary

Problems solved by technology

This method of realizing mutual transfer of data between L2VPN network and L3VPN network requires two lookups. For the network processor, loopback processing is required, which occupies a large amount of bandwidth and cannot realize wire-speed mutual conversion.

Images