TCP/IP Tutorial and Technical Overview - IBM Redbooks

The RSVP Resv messages looks similar to the path message. Figure 8-12
shows the objects used for reservation messages.
Figure 8-12 RSVP Resv message format
As in the path message, the Integrity object must follow the common header if it
is used. Another restriction applies for the Style object and the following flow
descriptor list. They must occur at the end of the message. The order of the other
objects follows the recommendation from the RFC.
For a detailed description of the RSVP message structure and the handling of
the different reservation styles in reservation messages, consult RFC 2205.
8.2.5 Integrated Services outlook
Integrated Services is designed to provide end-to-end quality of service (QoS) to
applications over heterogeneous networks. This means that Integrated Services
has to be supported by several different network types and devices. It also
means that elements within the network, such as routers, need information to
provide the requested service for an end-to-end QoS flow. This information setup
in routers is done by the Resource Reservation Protocol (RSVP). RSVP is a
signaling protocol that can carry Integrated Services information.
308 TCP/IP Tutorial and Technical Overview
Common Header
(Integrity)
Session
RSVP_Hop
Time_Values
(Reso_Confirm)
(Scope)
Style
Flow Descriptor List