Basic HTML version of Foils prepared 15 April 98

Foil 12 RSVP's Soft State

From Part II of RSVP Reservation Protocol CPS640 Internet and Multimedia Technologies -- Spring 98. by Marek Podgorny,Nancy McCracken


1 RSVP soft state is created and periodically refreshed by Path and Resv messages.
  • The state is deleted if no matching refresh messages arrive before the expiration of a "cleanup timeout" interval.
  • State may also be deleted by an explicit "teardown" message.
  • At the expiration of each "refresh timeout" period and after a state change, RSVP scans its state to build and forward Path and Resv refresh messages to succeeding hops.
  • When a route changes, the next Path message will initialize the path state on the new route, and future Resv messages will establish reservation state there
    • the state on the now-unused segment of the route will time out.

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