Presentation on theme: "1 68th IETF, Prague, March 2007 Graceful Shutdown in MPLS Traffic Engineering Networks draft-ietf-ccamp-mpls-graceful-shutdown-02.txt Zafar Ali"— Presentation transcript:
1 68th IETF, Prague, March 2007 Graceful Shutdown in MPLS Traffic Engineering Networks draft-ietf-ccamp-mpls-graceful-shutdown-02.txt Zafar Ali Jean Philippe Vasseur Anca Zamfir
222 68th IETF, Prague, March 2007 Agenda How review comments received are addressed? Next Steps
333 68th IETF, Prague, March 2007 Graceful Shutdown and FRR/ Segment Recovery Graceful shutdown may be exercised using make- before-break or FRR/ segment recovery procedure. When PLR/ branch 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/ Branch Node MAY trigger FRR/ segment recovery.
444 68th IETF, Prague, March 2007 Graceful Shutdown and Stitched LSP-es 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 (S-LSP) performs make- before-break or triggers FRR/ segment protection 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 will be performing make-before-break or FRR/ segment protection operation when GS-1 event is triggered. Definition of the node that can perform GS procedure has been extended to include Ingress LSR of an S-LSP. Area 1 ABR-1 ABR-2 Area 2 Area 0 GS-1 LSP Segment 1 LSP Segment 2 LSP Segment 3
555 68th IETF, Prague, March 2007 Graceful Shutdown and Bundled Links Local repair by using a different component link within the bundled TE link. Based on a local decision, PLR/ branch node MAY trigger FRR/ segment recovery to recover from failure of a component link.
666 68th IETF, Prague, March 2007 Overloading error code from RFC 4736 This ID inherits the Ingress behavior from RFC 4736, 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”. This drafts relies on TE LSP reoptimization at Ingress but also extends the handling of this error code/ sub-code at PLR/ branch node (which includes the case where ingress node is PLR/ branch node).
777 68th IETF, Prague, March 2007 Next Steps Need to address a nit, which as received after the revision. Addressed all major outstanding comments. The ID has been quite stable since version 1 and authors would like to call for a last call (on a quick re-spin that will address the above-mentioned nit and any further comments).