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Zafar Ali (zali@cisco) Jean Philippe Vasseur (jpv@cisco) Anca Zamfir (ancaz@cisco)

Graceful Shutdown in MPLS Traffic Engineering Networks draft-ietf-ccamp-mpls-graceful-shutdown-01.txt. Zafar Ali (zali@cisco.com) Jean Philippe Vasseur (jpv@cisco.com) Anca Zamfir (ancaz@cisco.com). Agenda. Changes from the last version.

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Zafar Ali (zali@cisco) Jean Philippe Vasseur (jpv@cisco) Anca Zamfir (ancaz@cisco)

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  1. Graceful Shutdown in MPLS Traffic Engineering Networksdraft-ietf-ccamp-mpls-graceful-shutdown-01.txt Zafar Ali (zali@cisco.com) Jean Philippe Vasseur (jpv@cisco.com) Anca Zamfir (ancaz@cisco.com)

  2. Agenda • Changes from the last version. • How review comments received on the list are addressed? 67th IETF, San Diego, November 2006

  3. Graceful Shutdown and Stitched LSP-es Area 0 ABR-1 • Component LSP segments are signaled as distinct TE LSPs in the control plane. In this example, the ABRs are responsible for "cross-connecting" the LSP segments. • Ingress LSR of each LSP segment performs make-before-break to move traffic from segment affected by GS of a node/ link, to a new segment avoiding node/ link under GS. • In this example, the ABR-1 performs make-before-break operation when GS-1 event is triggered. Area 1 Area 2 ABR-2 GS-1 LSP Segment 3 LSP Segment 1 LSP Segment 2 67th IETF, San Diego, November 2006

  4. Graceful Shutdown and FRR/ Segment Recovery • When PLR/ merge node receive a Path Error with Graceful Shutdown indication, • It MUST forward the Path Error to the Ingress node. • Based on a local decision, PLR/ merge node MAY trigger FRR/ segment recovery. 67th IETF, San Diego, November 2006

  5. Graceful Shutdown and Bundled Links • Local repair by using a different component link within the bundled TE link is NOT adapted. • If the local repair cannot be performed (due to lack of bandwidth), Ingress LSR is needed to move the traffic away from this bundled TE link. • It’s always a good practice to deal with exception cases using the same generic framework. 67th IETF, San Diego, November 2006

  6. Overloading error code from Loose Path Reoptimization Draft • Expected behavior of the Ingress LSR is exactly in the two drafts. • Both drafts require Ingress LSR to trigger Make-before-brake on the LSP affected by a Graceful showdown of a link/ node. • This ID inherits the Ingress behavior from draft-ietf-ccamp-loose-path-reopt-02.txt, which says- • “Upon receiving an RSVP PERR message with Error code 25 and Error sub- code 7 (Local link maintenance required) or 8 (Local node maintenance required), the Head-end LSR SHOULD perform a TE LSP reoptimization”. 67th IETF, San Diego, November 2006

  7. Next Steps • Addressed all outstanding comments. • Need to decide if this ID should be Informational or Standard’s Track. • The ID defines a new error sub-code for PathError. It also defines specific protocol behavior. • 9 (TBA) Local component link maintenance required. • After finalizing this debate and addressing any further comments, authors will do a quick a re-spin and request WG for the last call. 67th IETF, San Diego, November 2006

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