A method and system for optimizing resources for establishing pseudo-wires in a multiprotocol label switching network

Abstract

A method for establishing a pseudo-wire connection between first and second switches in a packet switched network, the method comprising: sending a label mapping message to the second switch requesting that the pseudo-wire connection be established with the first switch; reserving resources for the pseudo-wire connection at the first switch; receiving a label withdraw message from the second switch if the second switch has insufficient resources for the pseudo-wire connection and, in response to the label withdraw message, releasing the resources for the pseudo- wire connection at the first switch; and, activating the pseudo-wire connection if the second switch has sufficient resources for the pseudo-wire connection, thereby optimizing resources for establishing pseudo-wire connections of each of the first and second switches.

Description

technical field [0001] The present invention relates to the field of network management and service provision, in particular to a method and system for optimizing resources for establishing pseudowires in a multi-protocol label switching network. Background technique [0002] Multiprotocol Label Switching (MPLS) provides a mechanism for designing network traffic patterns in which shorter labels are assigned to network packets that describe how the packets are forwarded through the network. In an MPLS network, an MPLS-capable node, switch or router is usually called a Label Switching Router (LSR) and an LSR located at the edge (ingress or egress) of the MPLS network is usually called a Label Edge Router (LER). [0003] Typically, a data frame of a connectionless network layer protocol, such as the Internet Protocol (IP), travels from one node to the next in a network as it travels from a source node to a destination node. Each node makes an independent forwarding decision fo...

AI Technical Summary

Problems solved by technology

This can be problematic because a PW that cannot be established due to a failed request for a resource in one direction can hold a lock on the resource on the opposite end

This is inefficient because if locked resources were available, they might already be able to be used to allow successful establishment of a bidirectional PW or another type of connection (e.g. LSP) competing for resources to be established

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