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RSVP Reservation Styles
A reservation request includes options for specifying the reservation style. The reservation styles define how reservations for different senders within the same session are treated and how senders are selected.
Two options specify how reservations for different senders within the same session are treated:
- Distinct reservation—Each receiver establishes its own reservation with each upstream sender.
- Shared reservation—All receivers make a single reservation that is shared among many senders.
Two options specify how senders are selected:
- Explicit sender—List all selected senders.
- Wildcard sender—Select all senders, which then participate in the session.
The following reservation styles, formed by a combination of these four options, currently are defined:
- Fixed filter (FF)—This reservation style consists of distinct reservations among explicit senders. Examples of applications that use fixed-filter-style reservations are video applications and unicast applications, which both require flows that have a separate reservation for each sender. The fixed filter reservation style is enabled on RSVP LSPs by default.
- Wildcard filter (WF)—This reservation style consists of shared reservations among wildcard senders. This type of reservation reserves bandwidth for any and all senders, and propagates upstream toward all senders, automatically extending to new senders as they appear. A sample application for wildcard filter reservations is an audio application in which each sender transmits a distinct data stream. Typically, only a few senders are transmitting at any one time. Such a flow does not require a separate reservation for each sender; a single reservation is sufficient.
- Shared explicit (SE)—This reservation style consists of shared reservations among explicit senders. This type of reservation reserves bandwidth for a limited group of senders. A sample application is an audio application similar to that described for wildcard filter reservations.
