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IETF 70 Vancouver: draft-dolganow-ospf-pw3-ms-pw-ext-01

IETF 70 Vancouver: draft-dolganow-ospf-pw3-ms-pw-ext-01. authors: Alex Zinin, Andrew Dolganow, Dimitri Papadimitriou, Matthew Bocci, Mustapha Aissaoui – Alcatel-Lucent Luca Martini – Cisco Systems Frederic Jounay – France Telecom Yuji Kamite – NTT.

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IETF 70 Vancouver: draft-dolganow-ospf-pw3-ms-pw-ext-01

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  1. IETF 70 Vancouver:draft-dolganow-ospf-pw3-ms-pw-ext-01 authors: Alex Zinin, Andrew Dolganow, Dimitri Papadimitriou, Matthew Bocci, Mustapha Aissaoui – Alcatel-Lucent Luca Martini – Cisco Systems Frederic Jounay – France Telecom Yuji Kamite – NTT

  2. draft-dolganow-ospf-pw3-ms-pw-ext-01 • Motivation/Problem recap: • Need a method to dynamically establish MS-PW inside provider’s access, metro network • MP-BGP may not be deployed due to Opex/Capex constraints • Single OSPF AS in most cases • Draft so far: • First presented at IETF 68 in Prague • Comments received and incorporated in a new version • New co-authors added (Luca Martini)

  3. draft-dolganow-ospf-pw3-ms-pw-ext-01 • Changes from version 1.0 • Priority given to define consensus parts required for basic functionality: • Advertise AIIs required for placement of MS-PW using OSPF • Router does not necessarily need to have T-LDP or Tunnel to advertise PW Switching LSA • Opaque LSA mechanism used to flood the advertisements (both Area and AS scope are allowed) • Pseudo Wire switching LSAs carry AIIs attached at T-PEs / routable through S-PE using Exterior AII TLV. Routers learn which AIIs to advertise through: • Configuration • Advertisement • Interaction with exterior gateway protocols (BGP) • Full alignment with Dynamic Placement of Multi Segment Pseudo Wires

  4. draft-dolganow-ospf-pw3-ms-pw-ext-01 Area 1 S-PE C Area 10 Area 0 T-PE 2 Segment 2 Segment 1 Segment 3 S-PE B T-PE 1 S-PE A • Example: • Each S-PE and T-PE have their own L2 address (Global Id + prefix). • T-PE1 advertises its AIIs using an Exterior AII TLV in PW switching Opaque LSA flooded as per Opaque LSA procedures • S-PEs inject non-backbone AIIs into their backbone AII advertisement and vice-versa • Advertisements installed and used in PW routing DB at T-PE 2, which can now place Multi-Segment Pseudo Wires to T-PE 1’s AIIs

  5. draft-dolganow-ospf-pw3-ms-pw-ext-01 • Next steps • Adopt this draft as PWE3 WG draft (continue to work closely with OSPF group on any OSPF related topics) • Create an ISIS version

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