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Relayed cspf computation for multiple areas and multiple autonomous systems

A technology of area and path calculation, applied in the field of networking, can solve problems such as complex methods

Inactive Publication Date: 2013-06-19
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, the method described in RFC 5441 enforces a PCEP (Path Computation Element Protocol) extension that understands Virtual Shortest Path Trees (VSPT), which further complicates the method

Method used

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  • Relayed cspf computation for multiple areas and multiple autonomous systems
  • Relayed cspf computation for multiple areas and multiple autonomous systems
  • Relayed cspf computation for multiple areas and multiple autonomous systems

Examples

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Embodiment Construction

[0021] In the following description, numerous specific details are set forth. It is understood, however, that these specific details may not be needed to practice the embodiments of the invention. In other instances, well-known circuits, structures and techniques have not been shown in detail in order not to obscure the understanding of this description. With the included description, one of ordinary skill in the art will be able to implement appropriate functionality without undue experimentation.

[0022] References in the specification to "one embodiment," "an embodiment," "an example embodiment," etc. indicate that the embodiments may include a particular feature, structure, or characteristic, but that each embodiment may not necessarily include the particular feature, structure, or structure. or characteristics. Additionally, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure or characteristic is describ...

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Abstract

Computing a constraint-based label switched path (LSP) that spans multiple areas is described. In one embodiment, a router in a first one of the multiple areas computes a path segment that meets a set of one or more constraints to at least one border router of the first area that lies in a path necessary to reach the destination. The router transmits a path computation request message to a path computation element (PCE) in a second one of the areas, which includes a set of one or more attributes for each computed path segment that are used by the PCE to compute one or more path segments towards the destination of the constraint-based LSP. The router receives a path computation reply message from the PCE that specifies a set of one or more computed path segments that meet the set of constraints and that were computed by one or more PCEs downstream from the router. The router stitches at least one of the set of computed path segments that are specified in the path computation reply message with the path segment computed by the router to form at least part of the constraint-based LSP.

Description

[0001] Related Application Cross Reference [0002] This application claims priority to US Provisional Patent Application 61 / 384774, filed September 21, 2010, which is incorporated herein by reference. technical field [0003] Embodiments of the present invention relate to the field of networking; and more particularly, to computing constraint-based Label Switched Paths (LSPs) across multiple areas and / or multiple autonomous systems. Background technique [0004] The need for the ability to compute Label Switched Paths (LPS) across multiple regions or multiple autonomous systems has evolved from an academic discussion to a feature request for operator networks. There are several solutions that have been proposed for computing constraint-based LSPs across multiple regions or multiple autonomous systems. [0005] In one proposed solution, a global TE (Trade Engineering) database is used. While the global TE database is a simple solution for computing LSPs across multiple are...

Claims

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Application Information

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IPC IPC(8): H04L12/723H04L45/50H04L45/122H04L45/42
CPCH04L45/04H04L45/42H04L45/50H04L45/20H10N70/20
Inventor 陆文虎S.基尼S.纳拉亚南
Owner TELEFON AB LM ERICSSON (PUBL)