Method and device for forwarding virtual private network message

Abstract

A method and device for forwarding message of virtual private network. The method comprises: a Network Provider Edge Router(PE) carries out two-layer Virtual Private Network(VPN) conclusion on an uplink message received from a two-layer VPN and sends the uplink message subjected to the two-layer VPN conclusion to a port configured as a self loop; the PE receives the uplink message looped by the port configured as the self loop and subjected to the two-layer VPN conclusion and carries out three-layer VPN forwarding on the uplink message subjected to the two-layer VPN conclusion. According to the method and device, the two-layer VPN conclusion to the three-layer VPN forwarding is enabled by adopting a port trunking, uplink and downlink can be distinguished by only using one port trunking in a two-layer VPN and three-layer VPN networking, and therefore, the number of used networking equipment is decreased, the complexity of a networking is reduced, maintenance and management cost is saved and networking becomes more flexible.

Description

technical field [0001] The invention relates to the technical field of virtual private network (VPN), in particular to a method and device for forwarding virtual private network messages. Background technique [0002] At present, the MPLS (Multi-Protocol Label Switching) network is the development direction of the next-generation core network. Among the various VPN methods using MPLS technology, the most competitive ones are MPLS Layer 2 VPN and MPLS Layer 3 VPN. MPLS Layer 2 VPN is to transparently transmit the customer's Layer 2 data on the MPLS network. [0003] From the customer's point of view, the MPLS network is a Layer 2 switching network through which Layer 2 connections can be established between different nodes. MPLS Layer 2 VPN separates the management responsibilities of the network. The PE of the network operator (the edge equipment of the operator's backbone network) is only responsible for the connection and forwarding of the second layer between the custome...

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Problems solved by technology

[0007] The base station is connected to PE1 / 2 through a pseudowire. PE needs to provide Layer 2 VPN termination to Layer 3 VPN forwarding and reverse functions. Currently, ASCI (Application Specific Integrated Circuits) chips cannot continuously implement Layer 2 VPN termination to Layer 3 VPN. Layer VPN forwarding and Layer 3 VPN termination to Layer 2 VPN forwarding functions

[0008] At present, the functions of Layer 2 VPN termination to Layer 3 VPN forwarding and Layer 3 VPN termination to Layer 2 VPN forwarding are mainly realized through two devices, PE1 / 2 functions, one device performs Layer 2 VPN termination and forwarding functions, and another One device performs Layer 3 VPN forwarding and termination functions. This solution requires the use of two devices, and the cost is relatively high.

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