Signaling Standby States of PW Groups in H-VPLS draft-pdutta-l2vpn-hvpls-standby-00.txt

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Signaling Standby States of PW Groups in H-VPLS
draft-pdutta-l2vpn-hvpls-standby-00.txt
Pranjal Kumar Dutta Marc Lasserre John
Rigby Prashanth Ishwar
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H-VPLS Dual Homing

• Dual-homing defined in draft-ietf-l2vpn-vpls-ldp-0
  9.txt
• Active/Secondary PW status managed by MTU-s
• Traffic is blocked by MTUs
• Primary and secondary PEs forward BUM traffic to
  their MTUs
• Fast failover

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Problem Statement

• Shared PSN/link usage
• Unnecessary traffic on standy PW can affect other
  traffic streams
• Problem discussed in draft-ietf-l2vpn-vpls-bridge-
  interop-00.txt

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Solution

• Signal PW status to upstream PEs
• Use of LDP PW Status as defined in RFC4447
• New Status bit defined
• Standby
• Applicability
• H-VPLS dual homing
• Ring topologies

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Benefits

• Use of PW Grouping for scalability
• Optional mechanism
• Tradeoff between b/w usage failover time
• Applicability
• H-VPLS Dual Homing
• Other dual homing cases (e.g. PW redundancy, ring
  topologies)

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What is covered

• Signalling Standby state via LDP (RFC4447)
• Detailed State Machine
• Active/Standby state transitions
• Notification procedures
• Generic standby PWs
• MTU-PE Dual homing
• PE to PE

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Next steps

• Draft-muley-pwe3-redundancy described similar
  extensions for a different application
• Merge?
• Solicit comments on L2VPN list