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PCE Traffic Engineering Database Requirements

PCE Traffic Engineering Database Requirements. draft-dugeon-pce-ted-reqs-01.txt O. Dugeon, J. Meuric (France Telecom / Orange) R. Douville (Alcatel-Lucent) R. Casellas (CTTC) O.D de Dios (TiD). Motivations. PCE architecture and path computation need Network Information

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PCE Traffic Engineering Database Requirements

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  1. PCE Traffic Engineering Database Requirements draft-dugeon-pce-ted-reqs-01.txt O. Dugeon, J. Meuric (France Telecom / Orange) R. Douville (Alcatel-Lucent) R. Casellas (CTTC) O.D de Dios (TiD)

  2. Motivations • PCE architecture and path computation need Network Information • The Traffic Engineering Database (TED) contains these pertinent and suitable information regarding the underlying networks • However: • No RFC specifies the detailed contents of the PCE TED • Only TED MIB specification are ongoing (CCAMP) • A PCE TED is not limited to the information disseminated by the IGP • The fulfillement method of PCE TED is not specified • Multi-Domain path computation suffer from a lack of information in the TED • Lead to a non optimal result or to some difficulties to deploy them • Collaborative PCEs would benefit from neighbouring context • Goal: Identify some TED requirements for the PCE: • identification of the specific information to be stored in the TED • and how it may be populated

  3. Inventory of TED elements • First inventory has been split between Intra (MPLS & GMPLS) and Inter domain • Intra-domain • Standard TE information exchange by the IGP-TE • Inter-domain • ASBR of the foreign domains • Inter-domain Links TE • Traffic Engineering performance between Border Nodes (n) • To give performance indication on foreign domain n • But only as an abstract view (to not divulgate details of the network) • PCE (i) peer address associated with the AS number of the domain (i)

  4. TED Population • Some mechanisms and protocols have been identified for Intra-domain population • Some efforts are necessary for the Inter-domain section • Intra-domain • IGP-TE (IS-IS-TE or OSPF-TE) are commonly used • RFC 5088 and RFC 5089 help to auto discover PCE • Inter-domain • RFC 5316 and RFC 5392 provide TE information on inter-domain links • BGP just provides reachability

  5. Inter-domain status for TED Population • But Inter-domain needs more effort to correctly populate the PCE TED • Ongoing identified solutions • Management plane • North bound distribution of Link-State and TE Information using BGP [I-D.gredler-idr-ls-distribution] • PCNtf message to convey, inside vendor attribute (but in a non standardized way), TE information of foreign domains • All are non standard • Candidate standardisation efforts • A hierarchical TE protocol to advertise abstract TE information at the AS level • A PCEP extension to convey such TE information (e.g. through standard PCNtf message)

  6. Next Steps • Get feedback from PCE WG • We are here for that • Release a 02 version that: • Take into account GMPLS stuff • Improve Inter-domain definition • Consider multi-area / multi-region / multi-layer as inter-domain and not only inter AS • Add analysis and best-current practice for Intra-domain solutions • Add analysis of Inter-domain solutions

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