RFC 2209 (rfc2209) - Page 2 of 25
Resource ReSerVation Protocol (RSVP) -- Version 1 Message Processing Rules
Alternative Format: Original Text Document
RFC 2209 RSVP-Message Processing September 1997 PSB contents include the following values from a PATH message: - Session - Sender_Template - Sender_Tspec - The previous hop IP address and the Logical Interface Handle (LIH) from a PHOP object - The remaining IP TTL - POLICY_DATA and/or ADSPEC objects (optional) - Non_RSVP flag - E_Police flag - Local_Only flag In addition, the PSB contains the following information provided by routing: OutInterface_list, which is the list of outgoing interfaces for this (sender, destination), and IncInterface, which is the expected incoming interface. For a unicast destination, OutInterface_list contains one entry and IncInterface is undefined. Note that there may be more than one PSB for the same (session, sender) pair but different incoming interfaces. At most one of these, which will have the Local_Only flag off, will be the PSB used for forwarding PATH messages downstream; we will refer to it as the "forwarding PSB" in the following. The other PSB's will have the Local_Only flag on and an empty OutInterface_list.h The Local_Only flag is needed to correctly match PSB's against RSB's, by the rules of [RFC 2205]. o RSB -- Reservation State Block Each RSB holds a reservation request that arrived in a particular RESV message, corresponding to the triple: (session, next hop, Filter_spec_list). Here "Filter_spec_list" may be a list of FILTER_SPECs (for SE style), a single FILTER_SPEC (FF style), or empty (WF style). We define the virtual object type "FILTER_SPEC*" for such a data structure. Braden & Zhang Informational
