RFC 2379 (rfc2379) - Page 2 of 8
RSVP over ATM Implementation Guidelines
Alternative Format: Original Text Document
RFC 2379 RSVP over ATM Implementation Guidelines August 1998 This document uses the same terms and assumption stated in [2]. Additionally, the key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [5]. 2. Implementation Recommendations This section provides implementation guidelines for implementation of RSVP over ATM. Several recommendations are common for all, RSVP sessions, both unicast and multicast. There are also recommendations that are unique to unicast and multicast session types. 2.1 RSVP Message VC Usage The general issues related to which VC should be used for RSVP messages is covered in [6]. It discussed several implementation options including: mixed control and data, single control VC per session, single control VC multiplexed among sessions, and multiple VCs multiplexed among sessions. QoS for control VCs was also discussed. The general discussion is not repeated here and [6] should be reviewed for detailed information. RSVP over ATM implementations SHOULD send RSVP control (messages) over the best effort data path, see figure 1. It is permissible to allow a user to override this behavior. The stated approach minimizes VC requirements since the best effort data path will need to exist in order for RSVP sessions to be established and in order for RSVP reservations to be initiated. The specific best effort paths that will be used by RSVP are: for unicast, the same VC used to reach the unicast destination; and for multicast, the same VC that is used for best effort traffic destined to the IP multicast group. Note that for multicast there may be another best effort VC that is used to carry session data traffic, i.e., for data that is both in the multicast group and matching a sessions protocol and port. Berger Best Current Practice
