Illustrated TCP/IP by Matthew G. Naugle Wiley Computer Publishing, John Wiley & Sons, Inc. ISBN: 0471196568   Pub Date: 11/01/98

Chapter 333
Disabling a Reservation

Reservations are removed by Teardown messages. This is not required, but is recommended. If a reservation is not removed by the application, it will eventually be removed by the routers—a Refresh message has not been received and within a certain amount of time, the reservation must be removed. There are two types of Teardown messages:

PathTear: Received by all receivers downstream (from the point of initiation, not necessarily the sender) and deletes the path state (in routers, for example) and all dependent reservation state in each node that receives this information.

ResvTear: Deletes reservation state and travels upstream towards all senders from its point of initiation (again, not necessarily the final receiver). This message specifies style and filters. Any flowspec is ignored.