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Traffic engineered paths in a link state protocol controlled Ethernet network

A link state protocol and service engineering technology, applied in the field of Ethernet service routing protocols, which can solve problems such as node and/or link overloading

Inactive Publication Date: 2009-09-09
NORTEL NETWORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Additionally, in a Link State Protocol controlled Ethernet network, all traffic is sent on the shortest path through the network, which in certain circumstances can cause overloading of specific nodes and / or links on the network

Method used

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  • Traffic engineered paths in a link state protocol controlled Ethernet network
  • Traffic engineered paths in a link state protocol controlled Ethernet network
  • Traffic engineered paths in a link state protocol controlled Ethernet network

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Embodiment Construction

[0012] By adopting the shortest path forwarding without loop to provide more effective use of network capacity, and using link state protocol to control the Ethernet network, the Ethernet network can be upgraded from LAN space to WAN or provider network space. Instead of using the Spanning Tree Protocol (STP) algorithm combined with transparent bridging to utilize the learning network view on each node, the link state protocol controls the Ethernet network to form a mesh network bridge to exchange link state notifications , So that each node can have a synchronized view of the network topology. This is achieved via a fully understood mechanism of the link state routing system. The bridges in the network have a synchronized view of the network topology, understand the necessary unicast and multicast connectivity, can calculate the shortest path connectivity between any pair of bridges in the network, and can be individually based on the calculated view of the network Load its forwa...

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Abstract

Traffic Engineered (TE) paths may be created over a link state protocol controlled Ethernet network by causing explicit paths to be installed by network elements on the link state protocol controlled Ethernet network and used to forward traffic on the network. The network elements exchange routing information using link state advertisements to enable each node on the network to build a link state database that may be used to determine shortest paths through the network. The shortest paths are used as a default forwarding state for traffic that is not associated with one of the traffic engineered paths. The link state advertisements 'may also be used to carry the TE path definitions. Where the TE paths are to be used exclusive of other routes, forwarding state for particular service instances may be removed to prevent traffic from traversing the network other than over the TE path.

Description

[0001] Cross references to related applications [0001] This application claims the rights of U.S. Provisional Application 60 / 856275 filed on November 2, 2006 under the title "Combinging PLSB and PBT to Produce Engineerable ELAN Service", the content of which is incorporated herein by reference. Technical field [0001] The present invention relates to an Ethernet service routing protocol, and in particular, to a method and equipment for implementing an engineered path in a link state protocol controlled Ethernet network. Background technique [0002] In the Ethernet network architecture, devices connected to the network compete for the ability to use a shared remote communication path at any given time. Where multiple bridges or nodes are used to interconnect network segments, there are often multiple possible paths to the same destination. The beneficial effect of this architecture is that it provides path redundancy between bridges and allows capacity to be added to the network ...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L45/122
Inventor D·艾伦N·布拉格P·阿什伍德-史密斯
Owner NORTEL NETWORKS LTD
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