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A mechanism to support the multicast needs of layer 3 protocols in general, and IP in particular, over UNI 3.0/3.1 based ATM networks has been described in draft-ietf-ipatm-ipmc-12.txt. Two basic approaches exist for the intra-subnet (intra-cluster) multicasting of IP packets. One makes use of a mesh of point to multipoint VCs (the 'VC Mesh' approach), while the other uses a shared point to multipoint tree rooted on a Multicast Server (MCS). This memo provides details on the design and implementation of an MCS, building on the core mechanisms defined in draft-ietf-ipatm-ipmc-12.txt. INTERNET-DRAFT !draft-talpade-ipatm-marsmcs-01.txt? March 20, 1996 1 Introduction A solution to the problem of mapping layer 3 multicast service over the connection-oriented ATM service provided by UNI 3.0/3.1, has been presented in [GA96]. A Multicast Address Resolution Server (MARS) is used to maintain a mapping of layer 3 group addresses to ATM addresses in that architecture. It can be considered to be...

This specification defines the new UPDATE method for the Session Initiation Protocol (SIP). UPDATE allows a client to update parameters of a session (such as the set of media streams and their codecs) but has no impact on the state of a dialog. In that sense, it is like a re-INVITE, but unlike re-INVITE, it can be sent before the initial INVITE has been completed. This makes it very useful for updating session parameters within early dialogs.

This document describes a method for distributing a MARS service within a LIS[1]. This method uses the Server Cache Synchronization Protocol (SCSP)[2] to synchronize the MARS Server databases within a LIS. When SCSP is used to synchronize the caches of MARS Servers in a LIS, the LIS defines the boundary of an SCSP Server Group (SG).

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