3Com 4007R Implementation Guide - Page 608
RSVP Terminology, Reservation Style
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608 CHAPTER 22: QOS AND RSVP RSVP Terminology Familiarize yourself with the following RSVP terms: s RSVP Flow - A data stream that operates in simplex, going one way from the origin to multiple destinations. The flows go from a set of senders to a set of receivers. s Reservation Style - The types of multicast flows that RSVP installs: s Fixed Filter (distinct) Style - A flow that originates from one sender only (for example, a video application). This style requires a separate reservation per sender on each transmission type. s Shared Explicit - A shared-reservation flow that originates from a limited number of senders (for example, an audio application). This style identifies the flows for specific network resources. A single reservation can be applied to all senders in the set. s Wildcard Filter - A shared-reservation flow from all senders. s Total reservable bandwidth percentage - Controls the admission control policy. RSVP begins to refuse reservations when the requested bandwidth on an output link exceeds the total reservable bandwidth. You specify a percentage of the output link (a value of from 0 through 200, with 50 as the default). This percentage is the amount of bandwidth that you allow RSVP to reserve in the Multilayer Switching Module. You can over-subscribe (over 100) and specify a value up to 200. s Maximum per-reservation bandwidth - The largest reservation that RSVP attempts to install. Specify this bandwidth using a percentage of the output link (a value of from 0 through 100; 50 is the default). s Policing options - Ensure that an RSVP session uses only as much bandwidth as it requested. The policing options mandate when to drop nonconforming excess packets. You configure the Multilayer Switching Module to observe one of these policing options: s Edge - Causes nonconforming excess packets to be dropped only at the edge (that is, when the traffic has not yet passed through any network device that has already performed policing for that flow). The Multilayer Switching Module polices the flow when RSVP requests it. Edge is the default policing option. The RSVP protocol knows how to detect what is edge and what is not when it polices. s Always - The Multilayer Switching Module always polices the flow.
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