RFC 2907 (rfc2907) - Page 1 of 13

MADCAP Multicast Scope Nesting State Option

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Network Working Group                                         R. Kermode
Request for Comments: 2907                                      Motorola
Category: Standards Track                                 September 2000


              MADCAP Multicast Scope Nesting State Option

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2000).  All Rights Reserved.

Abstract

   This document defines a new option to the Multicast Address Dynamic
   Client Allocation Protocol (MADCAP) to support nested scoping. The
   new option's purpose is to allow clients to learn which scopes nest
   inside each other, and hence it may be used for expanding scope
   searches or hierarchical multicast transport.

Table of Contents

   1.  Introduction. . . . . . . . . . . . . . . . . . . . .    2
        1.1 Time-To-Live (TTL) Scoping Split Horizon Effect.    2
        1.2 Eliminating the Split Horizon Effect with
            Administrative Scoping . . . . . . . . . . . . .    3
        1.3 Terminology. . . . . . . . . . . . . . . . . . .    4
   2.  Multicast Nested Scoping State. . . . . . . . . . . .    5
   3.  Multicast Scope Nesting State Option. . . . . . . . .    5
        3.1 Multicast Scope List Option  . . . . . . . . . .    5
        3.2 Representing the Multicast Scope Nesting State .    6
        3.3 Multicast Scope Nesting State Option Usage . . .    7
   4.  Managing Dynamic Nested Scopes. . . . . . . . . . . .    8
        4.1 MADCAP Server processing of MZAP messages. . . .    9
        4.2 Updating State for Dynamic Nested Scopes due to
                Timer Expiration . . . . . . . . . . . . . .    9
   5.  Multicast Scope Nesting State Option Format . . . . .    9
   6.  Constants . . . . . . . . . . . . . . . . . . . . . .   10
   7.  Security Considerations . . . . . . . . . . . . . . .   11
   8.  IANA Considerations . . . . . . . . . . . . . . . . .   11
   9.  Acknowledgements. . . . . . . . . . . . . . . . . . .   11



Kermode                     Standards Track
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