IETF%2070%20Vancouver:%20draft-dolganow-ospf-pw3-ms-pw-ext-01

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IETF 70 Vancouverdraft-dolganow-ospf-pw3-ms-pw-e
xt-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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draft-dolganow-ospf-pw3-ms-pw-ext-01

• Motivation/Problem recap
• Need a method to dynamically establish MS-PW
  inside providers 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)

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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

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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 1s AIIs

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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