RSVP soft state is created and periodically refreshed by Path and Resv messages.
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The state is deleted if no matching refresh messages arrive before the expiration of a "cleanup timeout" interval.
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State may also be deleted by an explicit "teardown" message.
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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.
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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
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the state on the now-unused segment of the route will time out.
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