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Graceful Restart Mechanism for RSVP-TE Ping Pan

This mechanism ensures MPLS forwarding state is maintained during LSR control plane restarts. It allows for recovery of the control plane without disrupting the forwarding plane, terminating LSPs only necessary. Protocol includes capability advertisement through HELLO messages for quick recovery of labels, reducing refresh overhead. It is a useful, simple-to-implement feature that is backward compatible.

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Graceful Restart Mechanism for RSVP-TE Ping Pan

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  1. Graceful Restart Mechanism for RSVP-TE Ping Pan IETF 51, 8/6/2001

  2. Motivation • MPLS forwarding state is OK • IF… • LSR control plane restarts (e.g., due to crash, or s/w upgrade). • Control channel between LSR’s restarts. • THEN … • All LSP’s (at both control and forwarding level) are terminated… • Graceful Restart • Recover control plane • … while not disturb forwarding plane

  3. Operation: control plane restart Cap advertise Cap advertise LSP X LSP X LSP X A B C LSP X LSP X A B C State recovery State recovery LSP X LSP X LSP X A B C

  4. Operation: control channel restart Cap advertise Cap advertise LSP X LSP X LSP X A B C LSP X LSP X LSP X A B C State recovery LSP X LSP X LSP X A B C

  5. Protocol Issues • Capability Advertisement: • Use HELLO messages • RESTART_CAP object • Contain timing parameters • Recover labels • SUGGESTED_LABEL object [GMPLS] • Contain previously allocated labels • Refresh Reduction • Work as it is … • Will speed-up control-channel recovery

  6. Conclusions • Useful feature • Simple to implement • Backward compatible

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