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Enhancing Selective Inter-Domain VPWS with AII Aggregation for Improved Scalability

This document discusses the provisioning model for Selective Inter-Domain VPWS through the introduction of a new AII type. The proposed aggregation method aims to enhance scalability by summarizing multiple discrete AIIs into single or fewer aggregates, essential for supporting increasing demands on PE resources and management. Key topics include the implications of AII distribution, security concerns regarding PE learning, and the adaptability of AII numbering schemes to various addressing formats. The paper outlines the need for alignment with PWE3 signaling and the next steps in refining this approach.

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Enhancing Selective Inter-Domain VPWS with AII Aggregation for Improved Scalability

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  1. AII Types for Aggregationdraft-metz-aii-aggregate-00.txt Chris Metz, chmetz@cisco.com Luca Martini, lmartini@cisco.com Florin Balus, balus@nortel.com Jeff Sugimoto, sugimoto@nortel.com Paris IETF

  2. Scenario target PE set source PE • Provisioning Model: Selective Inter-Domain VPWS • provider triggers circuit (i.e. PW) signaling based on customer demand • PWE3 signaling must carry fully-qualified end-point identifier (i.e. TAI) U-PE4 C4 AS #2 AS #1 C1 U-PE5 U-PE1 S-PE2 S-PE3 U-PE6

  3. Issues Candidate Target AIIs source PE • Scalability: distributing O(# of candidate target AIIs) will stress AII distribution (e.g. MP-BGP) machinery and PE memory • Security: source U-PE1 is prohibited from learning IP addresses of candidate target PE set. Implication: can’t route PWE3 setups based on target U-PE IP address 1. AII Distribution U-PE4 AS #2 AS #1 U-PE5 U-PE1 S-PE2 S-PE3 U-PE6 2. Target PE /32 loopbacks

  4. What’s Needed • Define new AII Type: • enables many discrete AIIs to be summarized into a single or few AII aggregates (note: PW routing based on AII aggregates is needed) • option for global uniqueness • AII numbering flexibility – based on IPv4, IPv6, NSAP or other circuit addressing scheme • conformant with PWE3 FEC129 signaling semantics

  5. Short Prefix AII Type • Defined in Section 2.1 of draft • Multiple levels of aggregation possible (see draft for examples) • Affinity with IPv4 • e.g. auto-generate discrete AII values from PE /32 loopback • Optional Attachment Circuit ID (AC ID) included to further refine identification of a particular attachment circuit AC ID Length Prefix (32-bits) AII Type = 01 Global ID

  6. Long Prefix AII Type • Defined in Section 2.2 of draft • Hold longer prefixes (e.g. IPv6, NSAP or even IPv4) • e.g. useful if provider’s existing circuit-provisioning NMS uses NSAP addressing • AC ID not defined because there are enough bits in prefix field Length Prefix (256-bits) AII Type = 02 Global ID

  7. Final Comments • Selective VPWS provisioning model warrants AII aggregation for scalability • MS-PW is a signaling *AND* routing problem • when explicit paths not used or target U-PE address is not reachable, then PW routing must be based on something else • Next Steps: • Refinements: Use Route Distinguisher as Global ID? Both types needed? • Sync up with MS-PW signaling and routing efforts

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