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GMPLS Constraint Considerations for CSPF Path Computation

This document addresses GMPLS CSPF path computation challenges and provides guidelines for considering constraint attributes at the source node for accurate path computation. It discusses the factors affecting path computation results in integrated transport environments and emphasizes the correct handling of TE attributes for creating GMPLS LSPs. Key considerations include switching capabilities and encoding types of links for creating LSPs.

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GMPLS Constraint Considerations for CSPF Path Computation

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  1. GMPLS constraints consideration for CSPF path computationdraft-otani-ccamp-gmpls-cspf-constraints-01.txt Tomohiro Otani otani@kddilabs.jp Kenichi Ogaki ogaki@kddilabs.jp Arthi Ayyangar arthi@juniper.net Rajiv Papneja rpapnefa@isocore.com 63rdIETF Paris August 2005

  2. Summary of draft • This draft fits to the following charter item • Definition of the mechanisms required to determine the route and properties of an established path (tunnel tracing). • This draft • states the problem of GMPLS CSPF path computation • Since these constraints vary and are differently understood among such an integrated environment (especially between optical and packet transport point of view), the path computation results are sometimes different. • tries to provide the guideline to consider GMPLS constraint attributes for CSPF path computation at a source node. • TE attributes must be dealt with correctly for creating GMPLS LSP in the CSPF path computation considering underlying physical and logical technologies of links as well as nodes. 63rdIETF Paris August 2005

  3. Considered network model Ingress Transit Egress +-----+ link1-2 +-----+ link2-3 +-----+ link3-4 +-----+ |Node1|------------>|Node2|------------>|Node3|------------>|Node4| | |<------------| |<------------| |<------------| | +-----+ link2-1 +-----+ link3-2 +-----+ link4-3 +-----+ • To correctly establish a GMPLS LSP from an ingress to an egress, a possible combination of GMPLS attributes is investigated. • Simple constraintconsiderations for creating LSP • Switching capabilities (SC) of outgoing links from the ingress and egress nodes must be consistent with each other • SC of all transit links should be consistent with the switching type of a LSP to be created. • Encoding-types of all transit links should be consistent with the encoding type of a LSP to be created. 63rdIETF Paris August 2005

  4. Changes in 01 version • Multiple matches of encoding-type and SC was incorporated considering hierarchy. • Encoding-type and SC may have multiple matches on transit TE links LSP encoding TE Link encoding • Packet Packet, SONET/SDH, Ethernet, Lambda, Fiber • SONET/SDH SONET/SDH, Lambda, Fiber • Ethernet Ethernet, Lambda, Fiber • Lambda Lambda, Fiber LSP switching-type TE Link SC • Lambda Lambda, Fiber • FA-LSP should be used for other hierarchical considerations • New co-author • Rajiv papneja (Isocore) 63rdIETF Paris August 2005

  5. Further issues & questions • We would like to cover all possible cases to create a concrete guideline of CSPF path computation in terms of GMPLS attributes. • Especially L2SC • Any feedback would be greatly appreciated. • Is this categorized as whether BCP or specification? Since it is not enough information to categorized as BCP (practice!), it may be as specification. 63rdIETF Paris August 2005

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