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LSP Fast-Reroute Using RSVP Detours

LSP Fast-Reroute Using RSVP Detours. Ping Pan (presenter) IETF 51, 8/6/2001. Motivation. Flexible Protect user traffic from both link and node failure. Minimize user intervention and configuration. Operation. Fast-reroute Request. A. B. C. D. E. Detour Setup. A. B. C. D. E.

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LSP Fast-Reroute Using RSVP Detours

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  1. LSP Fast-Reroute Using RSVP Detours Ping Pan (presenter) IETF 51, 8/6/2001

  2. Motivation • Flexible • Protect user traffic from both link and node failure. • Minimize user intervention and configuration.

  3. Operation Fast-reroute Request A B C D E Detour Setup A B C D E Fast Reroute A B C D E

  4. Operation (detour merging) G E F A B C D E Detour Merging: Merging all detour reservations that come from different ingress, but have the same egress and next-hop. Goal: To shrink the states.

  5. Protocol Issues • Fast-Reroute Request • Inside Path messages • FAST-REROUTE object • Detour path parameters (e.g. bandwidth, etc.) • Detour Setup • Use IGP/TE to setup a new LSP • DETOUR object • Detour destination (learnt from RRO) • Process detour LSP’s independently

  6. Summary • Flexible and extensible • Guarantee CoS and b/w per LSP. • Single solution for both node and link protection. • Adaptive: • Does not require all nodes to support it. • Minimal user intervention. • Operational. • Require IGP/TE and RRO support.

  7. Scaling Issues • Designed to protect selective LSP’s. • Support detour LSP merging to reduce the total number of LSP’s. • Refresh reduction helps!

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