Method of phantom lines in multiple hops for building simulation of phantom line from end to end

Abstract

The method comprises: a) setting multi-jump PW (pseudo wire) parameters on the PW switch node; b) in term of the switching list item of multi-jump PW generated by said parameters, the PW switch node establishes the multi-jump PW; meanwhile the PW switch node can also establish multi-jump PW in term of switching list item generated by the information obtained from dynamical protocol. In the PWE3 services, the invention can ensure interconnection of the multi-jump PWE3 services in case of not running dynamical signaling LDP; beside, when the oscillation occurs in network, a great amount of signaling messages will not be produced.

Description

technical field [0001] The invention relates to end-to-end pseudowire emulation technology, in particular to a method for establishing end-to-end pseudowire emulation multi-hop pseudowire on a pseudowire switching node. Background technique [0002] Telecom operators initially provide enterprises with Layer 2 links in the form of leased lines to meet the needs of enterprise users. Because this method has the disadvantages of long construction time, unshareable lines, high price, and difficult management, it is not suitable for enterprise users with many branches and fast growth. Therefore, with the asynchronous transfer mode (ATM, Asychorize Transport Mode) Following the development of (FR, Frame Relay) technology, telecom operators began to use virtual circuits (Virtual Circuit) to provide customers with point-to-point layer-2 connections, on which enterprises build their own layer-3 networks to carry Internet Protocol (IP , Internet Protocol), Internet packet exchange con...

AI Technical Summary

Problems solved by technology

Because this method has the disadvantages of long construction time, unshareable lines, high price, and difficult management, it is not suitable for enterprise users with many branches and fast growth. Therefore, with the asynchronous transfer mode (ATM, Asychorize Transport Mode) Following the development of (FR, Frame Relay) technology, telecom operators began to use virtual circuits (Virtual Circuit) to provide customers with point-to-point layer-2 connections, on which enterprises build their own layer-3 networks to carry Internet Protocol (IP , Internet Protocol), Internet packet exchange control protocol (IPX, Internet Packet Exchange) and other data flows

Compared with the leased line, the virtual circuit method has the advantages of short service time and low price for operators, but it also has many disadvantages: it provides virtual private network (VPN, Virtual Private Network) on different types of networks, such as ATM and FR. ) business and Internet business, operators need to build and maintain a variety of independent networks, so the cost is still high; another disadvantage is that the rate is slow and the configuration is more complicated

[0005] The pseudowire switching technology solves the following three problems: (1) the edge equipment (PE, Provider Edge Device) of two service providers can be in different self-made system (AS) domains; (2) the PE of two service providers The network types are different, for example, one is MPLS network and the other is Layer 2 Tunneling Protocol Version 3 (L2TPv3, Layer 2 Tunneling Protocol, Version 3) network; (3) The PE performance of the service provider cannot meet the requirements, and the number of pseudowires is maintained Reduce the number of sessions carrying signaling under changing circumstances, and move up the aggregation of pseudowires

[0008] This method requires that all PE devices need to run dynamic protocols to negotiate parameters, and there are certain requirements for the performance of each device, and problems occur in a certain section of the MH-PW path, such as deleting configurations and interface status. Changes, tunnel or signaling session (Session) changes will cause the state of the entire MH-PW to change, resulting in a large number of signaling messages

Although PWE3 expands Notification to be used exclusively for notification messages of state changes, when the network flaps, this large amount of signaling overhead still seriously affects the performance of the network.

[0009] To sum up, although the existing technology adopts the fully dynamic protocol solution to complete the PW service, it has high requirements on the performance of the equipment. However, there are many types of access interfaces supported by PWE3, and the performance of each access equipment is required to meet the requirements. It is not realistic; and when the network fluctuates, the performance of the solution using the existing technology will be seriously affected

Images