An Abstract API for Multicast Address Allocation (RFC2771)
Original Publication Date: 2000-Feb-01
Included in the Prior Art Database: 2019-Feb-10
Internet Society Requests For Comment (RFCs)
This document describes the "abstract service interface" for the dynamic multicast address allocation service, as seen by applications. This memo provides information for the Internet community.
Network Working Group R. Finlayson Request for Comments: 2771 LIVE.COM Category: Informational February 2000
An Abstract API for Multicast Address Allocation
Status of this Memo
This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.
Copyright (C) The Internet Society (2000). All Rights Reserved.
This document describes the "abstract service interface" for the dynamic multicast address allocation service, as seen by applications. While it does not describe a concrete API (i.e., for a specific programming language), it describes - in abstract terms - the semantics of this service, including the guarantees that it makes to applications.
Additional documents (not necessarily products of the IETF) would describe concrete APIs for this service.
Applications are the customers of a multicast address allocation service, so a definition of this service should include not only the inter-node network protocols that are used to implement it, but also the ’protocol’ that applications use to access the service. While APIs ("application programming interfaces") for specific programming languages (or operating systems) are outside the domain of the IETF, it is appropriate for us to define - in abstract terms - the semantic interface that this service presents to applications. Specific APIs would then be based upon this abstract service interface.
Note that it is possible to implement the multicast address allocation service in at least two different ways. The first (and perhaps most common) way is for end nodes to allocate addresses by communicating with a separate "Address Allocation Server" node, using the "Host to Address Allocation Server" network protocol (MADCAP) . Alternatively, an "Address Allocation Server" implementation
Finlayson Informational [Page 1]
RFC 2771 Abstract API for Multicast Address Allocation February 2000
might be co-located (along with one or more applications) on an end node, in which case some other, internal, mechanism might be used to access the server. In either case, however, the abstract service interface (and, presumably, any specific APIs) would remain the same.
The remainder of this document describes the abstract interface.
Note that this interface is intended only for the allocation of dynamic multicast addresses, as used by the traditional multicast service model . Future multicast service models might allocate or assign multicast addresses in other ways, but this is outside the scope of this document.
2. Abstract Data Types
The interface described below uses the following abstract data types:
- AddressFamily: e.g., IPv4 or IPv6
- MulticastAddress: An actual multicast address (i.e., that could subsequently be used as the destination of a datagram)
- MulticastAddressSet: A set of "MulticastAddress"es
- LanguageTag: The code for a (human) language, as defined in