ST2+ over ATM Protocol Specification - UNI 3.1 Version
RFC 2383
| Document | Type |
RFC - Informational
(August 1998; No errata)
Was draft-suzuki-st2-over-atm (individual)
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|---|---|---|---|
| Last updated | 2013-03-02 | ||
| Stream | Legacy | ||
| Formats | plain text pdf htmlized bibtex | ||
| Stream | Legacy state | (None) | |
| Consensus Boilerplate | Unknown | ||
| RFC Editor Note | (None) | ||
| IESG | IESG state | RFC 2383 (Informational) | |
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Network Working Group M. Suzuki
Request for Comments: 2383 NTT
Category: Informational August 1998
ST2+ over ATM
Protocol Specification - UNI 3.1 Version
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 Notice
Copyright (C) The Internet Society (1998). All Rights Reserved.
Abstract
This document specifies an ATM-based protocol for communication
between ST2+ agents. The ST2+ over ATM protocol supports the matching
of one hop in an ST2+ tree-structure stream with one ATM connection.
In this document, ATM is a subnet technology for the ST2+ stream.
The ST2+ over ATM protocol is designed to achieve resource-
reservation communications across ATM and non-ATM networks, to extend
the UNI 3.1/4.0 signaling functions, and to reduce the UNI 4.0 LIJ
signaling limitations.
The specifications of the ST2+ over ATM protocol consist of a
revision of RFC 1819 ST2+ and specifications of protocol interaction
between ST2+ and ATM on the user plane, management plane, and control
plane which correspond to the three planes of the B-ISDN protocol
reference model.
1. Introduction
1.1 Purpose of Document
The purpose of this document is to specify an ATM-based protocol for
communication between ST2+ agents.
The ST2+ over ATM protocol is designed to support the matching of one
hop in an ST2+ tree-structure stream with one ATM connection; it is
not designed to support an entire ST2+ tree-structure stream with a
point-to-multipoint ATM connection only.
Suzuki Informational [Page 1]
RFC 2383 ST2+ over ATM August 1998
Therefore, in this document, ATM is only a subnet technology for the
ST2+ stream. This specification is designed to enable resource-
reservation communications across ATM and non-ATM networks.
1.2 Features of ST2+ over ATM Protocol
o Enables resource-reservation communications across ATM and non-ATM
networks.
ATM native API supports resource-reservation communications only
within an ATM network; it cannot support interworking with non-ATM
networks. This is because
- ATM native API cannot connect terminals without an ATM interface.
- ATM native API does not support IP addressing and SAP (port)
addressing systems.
o Extends UNI 3.1/4.0 signaling functions.
ST2+ SCMP supports MTU-size negotiation at all hops in an ST2+
tree-structure stream. UNI 3.1/4.0 supports only max CPCS_SDU
(i.e., MTU) negotiation with the called party of a point-to-point
call or with the first leaf of a point-to-multipoint call.
o Reduces UNI 4.0 LIJ signaling limitations.
The ST2+ over ATM protocol supports UNI 4.0 LIJ Call Identifier
notification from the root to the leaf by using an ST2+ SCMP
extension. LIJ Call Identifier discovery at the leaf is one of the
major unsolved problems of UNI 4.0, and the ST2+ over ATM protocol
provides a solution.
Note: The UNI 3.1 version of the ST2+ over ATM protocol does not
support the above feature. It will be supported by the UNI 3.1/4.0
version.
1.3 Goals and Non-goals of ST2+ over ATM Protocol
The ST2+ over ATM protocol is designed to achieve the following
goals.
o Specify protocol interaction between ST2+ [4] and ATM on the ATM
Forum Private UNI 3.1/4.0 (Sb point) [10, 11].
Note: The UNI 3.1 version of the ST2+ over ATM protocol does not
support UNI 4.0. It will be supported by the UNI 3.1/4.0 version.
Suzuki Informational [Page 2]
RFC 2383 ST2+ over ATM August 1998
o Support ST2+ stream across ATM and non-ATM networks.
o Define one VC on the UNI corresponding to one ST2+ hop; this VC is
not shared with other ST2+ hops, and also this ST2+ hop is not
divided into multiple VCs.
o Support both SVC and PVC.
o Not require any ATM specification changes.
o Coexist with RFC 1483 [16] IPv4 encapsulation.
o Coexist with RFC 1577 [17] ATMarp.
o Coexist with RFC 1755 [18] ATM signaling for IPv4.
o Coexist with NHRP [19].
Because ST2+ is independent of both routing and IP address resolution
protocols, the ST2+ over ATM protocol does not specify the following
protocols.
o IP-ATM address resolution protocol
o Routing protocol
Because the ST2+ over ATM protocol is specified for the UNI, it is
independent of:
o NNI protocol
o Router/switch architecture
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RFC 2383 ST2+ over ATM August 1998
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