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

Previous Table of Contents Next


Chapter 331
Reservation Style

In this reservation request is a set of options that are collectively known as the reservation style. These options allow for shared or unique (distinct) reservations. Examples of shared reservations are for those invoking the use of multicast. Video and audio apps that make use of multicast are great examples of this. Why have multiple reservations for these receivers when one guaranteed pipe will do? The distinct type of reservation is for one-on-one applications such as a small desktop-to-desktop videoconference or when some other type of high-priority, low-loss data stream is needed.

Reservation Style

•  RSVP uses several reservation “styles” to fit a variety of applications within Resv messages:
•  Styles are collective sets of options included in the Resv request message
•  One option concerns the treatment of reservations as distinct or shared
•  Another option controls the selection of senders, be that an explicit list or a wildcard implementation:
•  Wildcard-Filter (WF) style
•  Fixed-Filter (FF) style
•  Shared- Explicit (SE) style

A receiver may request a confirmation and will indicate this in the Resv message along with its address. One the reservation is confirmed either unique or merged, a confirmation message is sent.

The basic reservation is completed in one pass. This means that the Resv message is sent from one router to another in the reverse path to the sender. Each router along the way has the right to reject an Resv request.


Previous Table of Contents Next