Method for implement virtual leased line

Abstract

The present invention discloses a method for implementing the Virtual Leased Line. It can utilize fully the prior equipments, implement the automatic configuration and ensure the demands of the aspects of traffic engineering etc. When the encapsulation is simple and the cost is lower. The method for implementing the Virtual Leased Line comprises the steps: A) configuring the label stack of the VLAN based on the VLAN QinQ; B) setting the intercommunication between the VLAN QinQ switching equipment and the multi-protocol label switching equipment; C) expanding the label distribution protocol to encapsulate the VLAN label in order to distribute the VLAN label and make the expanded the label distribute protocol as the topological discovery protocol of the L2 VPN; D) setting the range of the VLAN label; E) implementing the Virtual Leased Line by constructing the switched path of VLAN, based on the the steps A, B, C and D.

Description

technical field [0001] The present invention relates to the realization of a virtual private network, in particular to the realization of a virtual leased line virtual private network. Background technique [0002] After more than 30 years of development, the Ethernet technology based on the Transmission Control Protocol / Internet Protocol (TCP / IP for short) has become an absolutely dominant LAN technology and has successfully entered the public network. The core network is rooted in the metropolitan area network and gradually penetrates into the public access network. For almost every application, Ethernet technology has become the de facto transmission protocol standard. Due to its simplicity, flexibility and low cost, its advantages have far exceeded some traditional technologies, such as Token Ring (Token Ring) ), fiber distributed data interface (Fiber Distributed Data Interface, referred to as "FDDI") and asynchronous transfer mode (Asynchronous Transfer Mode, referred...

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Problems solved by technology

[0021] In actual application, the above-mentioned scheme has the following problems: the VLL implementation scheme described in technical scheme one and technical scheme two has complex encapsulation protocols, and for the case of Ethernet metropolitan area network, the encapsulation overhead is relatively large; The QinQ implementation of VLL requires a lot of configuration and maintenance work when the network is large.

[0022] The main reason for this situation is that the VLL implementation methods described in technical solution 1 and technical solution 2 are based on MPLS label switching, the protocol is relatively complicated, and because there are two layers of MPLS labels and two Ethernet link layer frame headers , so the encapsulation overhead is high; the label of technical solution 3 is statically configured, so when the network is large, configuration and maintenance are more difficult, resulting in increased workload

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