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Load balancing in shortest-path-bridging networks

A shortest path bridging and network technology, applied in the field of data communication network, can solve problems such as incompatibility

Active Publication Date: 2013-06-26
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This lack of support is a result of the need for consistency between unicast and multicast traffic, and because multicast is generally incompatible with ECMP

Method used

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  • Load balancing in shortest-path-bridging networks
  • Load balancing in shortest-path-bridging networks
  • Load balancing in shortest-path-bridging networks

Examples

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Embodiment Construction

[0026] It should be understood that the following description, while indicating several embodiments of the invention, is given by way of illustration only. Various changes and modifications within the scope of the invention as claimed will become apparent to those skilled in the art upon reading the following description and upon viewing the accompanying drawings.

[0027] The IEEE has developed the 802.1aq standard for shortest path bridging to provide logical Ethernet networks over native Ethernet infrastructure. 802.1aq-enabled nodes (SPB-capable bridges) advertise network topology and membership in logical networks using the Intermediate System-to-Intermediate System (ISIS) link-state protocol. This well-known routing protocol allows nodes in a network to automatically determine the shortest paths between nodes. In effect, each bridge advertises the nodes it knows to all other nodes, so that all bridges in the network end up having a similar view of the network. Each nod...

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Abstract

A flow classification process is used at the edge of the shortest path bridging network to determine a flow label (320) for attachment to a client frame (330) entering the network. Any of several flow labels (320) can be assigned to a client frame (330) traversing the network to a particular egress node, and the flow labels are used by forwarding nodes to select among multiple equal -cost paths. In several embodiments, the flow label is calculated as a function of the client frame contents, which provide an entropy source for randomizing the selection of the flow label. This entropy source comprises the Internet Protocol (IP) header in the client frame, in some embodiments, but may comprise other client frame content in other cases.

Description

[0001] related application [0002] This application claims priority under 35 U.S.C. $119(e) to Provisional Patent Application Serial No. 61 / 408037 filed October 29, 2010, and also claims provisional patent application Serial No. 61 / 408037 filed January 6, 2011 under 35 U.S.C. $119(e) Priority of application serial number 61 / 430281. The entire content of each of the provisional applications mentioned above is incorporated herein by reference. Background technique [0003] The present invention relates generally to data communications networks and, in particular, to techniques for facilitating load balancing in a data packet network backbone utilizing shortest path bridging. [0004] Load distribution or load distribution is a method of more efficiently utilizing data communication bandwidth and improving overall performance in a network. More specifically, Equal Cost Multipath (ECMP) is a common strategy for load distribution of unicast traffic in routed networks. In cases ...

Claims

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Application Information

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IPC IPC(8): H04L12/803H04L12/46H04L45/122H04L45/74H04L45/121H04L45/50
CPCH04L12/4625H04L45/38H04L45/745H04L47/125H04L45/12H04L45/121H04L45/122H04L45/123H04L47/2483H04L45/74H04L47/122
Inventor D.I.艾伦S.A.曼斯菲尔德E.格雷J.法卡斯
Owner TELEFON AB LM ERICSSON (PUBL)
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