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Inter-AS PCE discovery

Inter-AS PCE discovery. Authors : Vijayanand HCL technologies Somen Bhattacharya Prasanna Nagabhushan Avici Systems. Motivation.

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Inter-AS PCE discovery

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  1. Inter-AS PCE discovery Authors: Vijayanand HCL technologies Somen Bhattacharya Prasanna Nagabhushan Avici Systems Avici Systems

  2. Motivation * Inter-AS TE paths require PCE to PCE communication across AS for relaying path computation requests through PCECP. * Dynamic discovery helps PCE to discover suitable PCE for PCECP across AS for the path computation. * Using MP-BGP new afi/safi extensions to facilitate the exchange of PCE information across AS domains. * BGP inherent protocol security, scalability, policy based filtering can be used for propagation of PCE information. * Interoperability between BGP and IGP by maintaining the same PCE TLV discovery structure defined in IGP. * Defined unused PCE TLV capability bits to specify new Inter AS specific PCE capabilities. Avici Systems

  3. MP BGP extensions * The PCE discovery TLV and PCE Status TLV will be carried in the MP-Reach NLRI of BGP update messages. BGP speakers shall encode this in a new <AFI,SAFI> value <TBD,TBD>. * The path computation capability PATH-COMP-CAP sub-TLV is carried in the PCE discovery TLV. This is used to advertise path computation specific capabilities of the PCE. 7 DRA bit: Capability to compute inter-area diverse paths 8 DAS bit: Capability to compute intra-AS diverse paths 9 DRS bit: Capability to compute inter-AS diverse paths 10 C bit : Capability to handle inter-AS policy constraints 11 T bit : Capability to handle diff-serv aware TE requests 9-31 : Reserved for future use. * The ALTERNATE-PCES sub-TLV specifies the set of PCEs as an alternate to a given primary PCE for path computation purposes. One or more alternate PCE can be selected when the given primary PCE fails. Avici Systems

  4. Use case scenario pce-igp-disc/ pce-mp-ibgp Inter-AS LSP pce-mp-ebgp AS 100 AS 200 PCE PCE ASBR ASBR PCC PCC ASBR • PCE stores discovery information and updates the received capability and congestion status to choose suitable PCE for setting up PCECP • Discovery information needs to traverse only few (neighboring ?) ASes, BGP Policy can be used to achieve this Avici Systems

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