 |
|
When a resource reservation request is initiated, the request
is sent to the policy and admission control modules. The admission
control module will check to see if the node can satisfy the
request. The policy control module determines if the entity
requesting the reservation has the required privileges to do so. If
either of these checks is unsuccessful, the application will be
notified of the failure. If no failures occur, the classifier and
the packet scheduler establish the requested reservation. Multicast
membership is usually dynamic. Hosts can join or leave a multicast
group at any time. To accommodate the dynamic nature of multicast
data flows, RSVP will periodically send refresh messages along the
data flow path in order to maintain the established reservation.
When refresh messages stop being sent, the reservation will timeout,
releasing the resources back to the system. |
| |