lsp fast-reroute using rsvp detours
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LSP Fast-Reroute Using LSP Fast-Reroute Using RSVP DetoursRSVP Detours
Ping Pan (presenter)
IETF 51, 8/6/2001
2
MotivationMotivation
• Flexible
• Protect user traffic from both link and node failure.
• Minimize user intervention and configuration.
3
OperationOperation
A B C ED
Fast-reroute Request
A B C ED
Detour Setup
A B C ED
Fast Reroute
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Operation (detour merging)Operation (detour merging)
A E
E G
B D
F
C
Detour Merging: Merging all detour reservations that come fromdifferent ingress, but have the same egress and next-hop.
Goal: To shrink the states.
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Protocol IssuesProtocol Issues
• Fast-Reroute RequestFast-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 independentlyProcess detour LSP’s independently
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SummarySummary
• Flexible and extensibleFlexible and extensible– Guarantee CoS and b/w per LSP.
• Single solution for both node and link Single solution for both node and link protection.protection.
• Adaptive:Adaptive:– Does not require all nodes to support it.
• Minimal user intervention.Minimal user intervention.• Operational.Operational.• Require IGP/TE and RRO support.Require IGP/TE and RRO support.
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ScalingScaling Issues Issues
• Designed to protect selective LSP’s.Designed to protect selective LSP’s.
• Support detour LSP merging to reduce Support detour LSP merging to reduce the total number of LSP’s.the total number of LSP’s.
• Refresh reduction helps!Refresh reduction helps!
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