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LSP Fast-Reroute Using RSVP Detours

Learn about the operation, protocol issues, and benefits of Fast Rerouting using Detours in network scenarios to minimize user intervention and configuration. Understand the detour merging process, protocol challenges, and scaling issues faced by this technique. It aims to protect user traffic from both link and node failures with minimal user intervention, guaranteeing Class of Service (CoS) and bandwidth per Label Switched Path (LSP).

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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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