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Residence Time Measurement draft-mirsky-mpls-residence-time-02

Residence Time Measurement draft-mirsky-mpls-residence-time-02. Greg Mirsky gregory.mirsky@ericsson.com John Drake jdrake@juniper.net Stewart Bryant stbryant@cisco.com Alexander Vainshtein Alexander.Vainshtein@ecitele.com Stefano Ruffini stefano.ruffini@ericsson.com

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Residence Time Measurement draft-mirsky-mpls-residence-time-02

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  1. Residence Time Measurementdraft-mirsky-mpls-residence-time-02 Greg Mirsky gregory.mirsky@ericsson.com John Drake jdrake@juniper.net Stewart Bryant stbryant@cisco.com Alexander Vainshtein Alexander.Vainshtein@ecitele.com Stefano Ruffini stefano.ruffini@ericsson.com IETF90 July, 2014, Toronto

  2. Problem Statement • Residence Time – time it takes a packet to traverse a node • Clock synchronization protocols, i.e. IEEE-1588v2, may use residence time • MPLS Packet Delay Measurement RFC 6374 includes propagation delay – not useful

  3. Update in -02 • Welcome Stefano Ruffini • TLV to carry time synchronization protocol packet • Use cases: • RTM capable homogeneous environment • Residence time can be measured across LSPs instantiated by LDP • RSVP-TE LSP signaling and TTL “distance” calculation • To the next RTM-capable downstream LSR

  4. RSVP-TE Control plane • Initialize Record Route and RTM Set Objects in Path message • Resv message includes RRO and RTM Set Objects • The RTM-capable transit LSR: • Uses the first LSR ID in the RTM Set Object and its position in the RRO to calculate TTL distance to the next downstream RTM capable LSR on the LSP • Inserts its ID as the first ID into the RTM Set Object before forwarding the Resv message

  5. Data plane (updated) • New G-ACh – Residence Time Measurement • Scrath pad – 8 bytes (same size as Correction Field in IEEE 1588v2) • Mandatory TLV – new • Type indicates the payload, e.g. PTP packet unauthenticated • Each RTM capable LSR: • records RTM reception time • sets TTL in MPLS label stack element to expire on the next RTM capable downstream LSR on this LSP • records RTM transmission time, calculates node residence time and adds to the Scratch Pad • Egress LSR may use the Scratch Pad to perform time correction, e.g. update the PTP’s Correction Field 0 0 0 1 Version Residence Time Measurement Channel ID Reserved Scratch Pad (8 bytes) Length Type Value

  6. Next steps • IGP TE extensions: RTM Capability sub-TLV in Router Capabilities TLV for OSPF and IS-IS • Facilitates computation of RTM-capable LSPs by CSPF • Allows recognition of the special case when all LSRs are RTM-capable • RSVP-TE Extensions: Define RTM Set Object in RSVP-TE • Solicit comments & feedback from the WG

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