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Attila Takacs (attila.takacs@ericsson) Francesco Fondelli (francesco.fondelli.ericsson)

RSVP-TE Recovery Extension for data plane initiated reversion, protection timer and SNC options signalling draft-takacs-ccamp-revertive-ps-07.txt. Attila Takacs (attila.takacs@ericsson.com) Francesco Fondelli (francesco.fondelli.ericsson.com)

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Attila Takacs (attila.takacs@ericsson) Francesco Fondelli (francesco.fondelli.ericsson)

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  1. RSVP-TE Recovery Extension for data plane initiated reversion, protection timer and SNC options signallingdraft-takacs-ccamp-revertive-ps-07.txt Attila Takacs (attila.takacs@ericsson.com) Francesco Fondelli (francesco.fondelli.ericsson.com) Benoit Tremblay (benoit.c.tremblay@ericsson.com) Zafar Ali (zali@cisco.com) - Presenter 85th IETF, CCAMP WG, Atlanta, GA (November 2012)

  2. Outline • Requirements • Solution • Next Steps

  3. Requirements • For successful establishment of a protected service, Ingress and Egress nodes need to agree on the following protection attributes: • Protection Revert Mode (i.e., revertive or non-revertive) [RFC4427] • Hold-off time (HOFF) [RFC4427] • Wait-to-Restore time (WTR) [RFC4427] • SNC Mode • Pre-configuration of these protection attributes on per LSP basis is neither desirable nor scalable. • Typically, these values are pre-configured to a default value. • Operators may need to tune WTR and HOFF timers on a per LSP basis to ensure best protection switching performance (e.g., to account for differential delays between worker and protection paths). • Currently RSVP-TE does not specify signalling of these protection attributes. • This requirement is identified in MPLS-TP Control Plane Framework Document.

  4. Solution • Update Protection Object format (a new C-Type) allowing sub-TLVs 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Length | Class-Num(37) | C-Type(2 IANA)| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |S|P|N|O| Reserved | LSP Flags | Reserved | Link Flags| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |I|R| Reserved | Seg.Flags | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ sub-TLVs ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ • Introduce WTR, HOFF and SNC-options sub-TLVs • If the WTR timer value is set to 0, the protection switching operation mode is assumed to be non-revertive (otherwise revertive).

  5. Next steps • Solution proposed in this draft has been identified in MPLS-TP Control Plane Framework as a (TP) requirement • Draft has been through various revisions and is quite stable • We would like to make this draft a WG Document

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