Method of transmitting and receiving message and a provider edge router

Abstract

The invention provides a method of transmitting and receiving message and a provider edge router (PE), wherein the method of transmitting and receiving message is applied to virtual private LAN service (VPLS) network, and in the VPLS network, at least one interface type of the interfaces between a second PE and a CE direct connected with the PE is non-Ethernet interface, and at least one interface type of the interfaces between a first PE and a CE direct connected with the PE is Ethernet interface. The method includes: a second PE exchanges private network tags with a first PE; the second PE receives an address resolution protocol (ARP) request from the resource CE that encapsulates the private network tags, and return a medium access control (MAC) address of the second PE to the resource CE; the second PE receives a Ethernet message encapsulated with the private network tags from the resource CE by the first PE, and re-encapsulates the Ethernet message according to the type of the non-Ethernet interface then transmits the message to destination CE. The invention can support various kinds of link interface between the PE and the CE and expand application flied of the VPLS network.

Description

technical field [0001] The present invention relates to the technical field of Virtual Private LAN Service (VPLS, Virtual Private LAN Service), in particular to a message sending and receiving method and a provider edge router (PE, ProviderEdge Router). Background technique [0002] VPLS is a technology that provides similar local area network (LAN, Local Area Network) connections for geographically isolated sites on a Multi-protocol Label Switching (MPLS, Multi-protocol Label Switching) network. Through VPLS, users can simultaneously access the network and visit each other from multiple geographically dispersed sites, and the connection effect of each site is the same as in a LAN. [0003] figure 1 It is a schematic diagram of a typical VPLS network structure in the prior art. The provider edge router (PE, Provider Edge Router) is connected with the user edge router (CE, Custom Edge Router), and is mainly responsible for service access. Mapping and forwarding from the pri...

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Problems solved by technology

[0005] In the current VPLS network structure stipulated in the agreement, the link interface type between CE and PE can only be Ethernet. However, there are Point-to-Point Protocol (PPP, Point to Point Protocol) and Frame Relay (FR , Frame Relay) and other Layer 2 protocols, the traditional VPLS networking method causes different Layer 2 protocol types of networks to be unable to communicate with each other, which brings great inconvenience to actual networking applications and largely limits The Development of VPLS and Its Deployment in Practical Applications

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