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Graceful Restart Mechanism for RSVP-TE

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

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Graceful Restart Mechanism for RSVP-TE

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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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