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Establishing pseudowires in packet switching networks

A technology of packet switching network and pseudowire, which is applied in the field of communication network, and can solve problems such as the inability to dynamically establish pseudowires and PE system parameter exchange failures.

Inactive Publication Date: 2011-06-15
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when part of the PSN tunnel is statically configured, there is no input and output FEC table associated with the SDP of the statically configured part, which leads to failure of parameter exchange between PE systems
This failure prevents dynamic establishment of pseudowires when the portion of the PSN tunnel used by the pseudowire is statically configured, such as a TDM pseudowire

Method used

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  • Establishing pseudowires in packet switching networks
  • Establishing pseudowires in packet switching networks
  • Establishing pseudowires in packet switching networks

Examples

Experimental program
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Embodiment Construction

[0020] refer to figure 1 , a Packet Switched Network (PSN) 10, which in this case is an MPLS network, provides Circuit Emulation Service (CES) between a first Customer Edge (CE) system 12 and a second CE system 14 . The first CE system is connected to a first Provider Edge (PE) system 16 via a first additional circuit 18, which in this case is a TDM circuit. The second CE system 14 is connected to the second PE system 20 through a second additional circuit 22, wherein the second additional circuit is also a TDM circuit. The first PE system 16 and the second PE system 20 are label switching routers. TDM pseudowires 24 deployed between PE systems 16 and 20 provide local telecommunications services, such as T1 leased lines, over a packet-switched network. As mentioned above, according to the prior art, PE systems 16 and 20 provide encapsulation, decapsulation, timing and sequencing functions to communication protocol data units (PDUs) of local telecommunications services over T...

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Abstract

Embodiments of the invention enable a pseudowire to be dynamically established over a PSN tunnel when the tunnel includes both statically configured segments and dynamically configured segments. Advantageously, these embodiments enable a network node that supports only static tunnel and pseudowire configuration to be included in dynamically configured pseudowires.

Description

technical field [0001] The present invention relates to communication networks and in particular to establishing a pseudowire (PW) using a tunnel connection having a statically configured part and a dynamically configured part. Background technique [0002] A pseudowire is a mechanism for carrying local telecommunication services (eg T1 leased lines, frame relay, Ethernet) over packet-switched networks in a transparent manner that emulates a wired connection. Specifically, the PSN uses Internet Protocol (IP) or Multiprotocol Label Switching (MPLS) packet forwarding. Protocol data units (PDUs) for local services are communicated between two customer edge (CE) systems, where each CE system initiates or terminates local services. Specifically, the CE system participates in two-way communication by using local services carried by pseudowires. [0003] Each CE system is connected to various Provider Edge (PE) systems through additional circuits. Pseudowires are provided betwee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/46H04L12/56
CPCH04L12/4633H04L45/68H04L45/50H04L12/64
Inventor S·皮尔巴伊C·E·特拉德尔A·菲尼克斯
Owner ALCATEL LUCENT SAS