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The Resource Reservation Protocol for Traffic Engineering (RSVP-TE) must recover its state after a control plane failure so that the established connections in the data plane continue to be provided full services, are not disrupted by new connection setup requests, and survive any data plane failures. The authors outline the RSVP-TE Graceful Restart (GR) mechanism defined by the IETF. In this paper, they provide a comprehensive survey of the information that may be carried by RSVP-TE signaling messages when a connection is to be established and the state information that is stored in an RSVP-TE signaling module. They, then propose an enhancement for RSVP-TE GR to alleviate the requirement of local recovery of the data plane state.
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