RFC 1237 (rfc1237) - Page 1 of 49
Guidelines for OSI NSAP Allocation in the Internet
Alternative Format: Original Text Document
Network Working Group Richard Colella (NIST)
Request for Comments: 1237 Ella Gardner (Mitre)
Ross Callon (DEC)
July 1991
Guidelines for OSI NSAP Allocation in the Internet
Status of This Memo
This RFC specifies an IAB standards track protocol for the Internet
community, and requests discussion and suggestions for improvements.
Please refer to the current edition of the ``IAB Official Protocol
Standards'' for the standardization state and status of this protocol.
Distribution of this memo is unlimited.
Abstract
The Internet is moving towards a multi-protocol environment that
includes OSI. To support OSI in the Internet, an OSI lower layers
infrastructure is required. This infrastructure comprises the
connectionless network protocol (CLNP) and supporting routing
protocols. Also required as part of this infrastructure are guidelines
for network service access point (NSAP) address assignment. This paper
provides guidelines for allocating NSAPs in the Internet.
This document provides our current best judgment for the allocation
of NSAP addresses in the Internet. This is intended to guide initial
deployment of OSI 8473 (Connectionless Network Layer Protocol) in
the Internet, as well as to solicit comments. It is expected that
these guidelines may be further refined and this document updated as a
result of experience gained during this initial deployment.
RFC 1237 Guidelines for OSI NSAP Allocation in the Internet July 1991
Contents
1 Introduction 4
2 Scope 4
3 Background 6
3.1 OSI Routing Standards . . . . . . . . . . . . 7
3.2 Overview of DIS10589 . . . . . . . . . . . . 8
3.3 Requirements of DIS10589 on NSAPs . . . . . . . . 11
4 NSAP and Routing 13
5 NSAP Administration and Routing in the Internet 17
5.1 Administration at the Area . . . . . . . . . . 19
5.2 Administration at the Leaf Routing Domain . . . . . 21
5.3 Administration at the Transit Routing Domain . . . . 21
5.3.1 Regionals . . . . . . . . . . . . . . 22
5.3.2 Backbones . . . . . . . . . . . . . . 23
5.4 Multi-homed Routing Domains . . . . . . . . . . 24
5.5 Private Links . . . . . . . . . . . . . . . 29
5.6 Zero-Homed Routing Domains . . . . . . . . . . 30
5.7 Transition Issues . . . . . . . . . . . . . 31
6 Recommendations 34
6.1 Recommendations Specific to U.S. Parts of the Internet . 35
Colella, Gardner, & Callon