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Use of OSI IS-IS for routing in TCP/IP and dual environments (RFC1195)

IP.com Disclosure Number: IPCOM000002008D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2003-Sep-11

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R.W. Callon: AUTHOR

Abstract

This RFC specifies an integrated routing protocol, based on the OSI Intra-Domain IS-IS Routing Protocol, which may be used as an interior gateway protocol (IGP) to support TCP/IP as well as OSI. This allows a single routing protocol to be used to support pure IP environments, pure OSI environments, and dual environments. This specification was developed by the IS-IS working group of the Internet Engineering Task Force.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 3% of the total text.

Network Working Working Group R. Callon

Request for Comments: 1195 Digital Equipment Corporation

December 1990

Use of OSI IS-IS for Routing in TCP/IP and Dual Environments

Status of this Memo

This RFC specifies a protocol on the IAB Standards Track 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.

This RFC is available in both postscript and text versions. Where

possible, use of the postscript version is recommended. For example,

this text version may have figures which are less informative or

missing.

Abstract

This RFC specifies an integrated routing protocol, based on the OSI

Intra-Domain IS-IS Routing Protocol, which may be used as an interior

gateway protocol (IGP) to support TCP/IP as well as OSI. This allows

a single routing protocol to be used to support pure IP environments,

pure OSI environments, and dual environments. This specification was

developed by the IS-IS working group of the Internet Engineering Task

Force.

The OSI IS-IS protocol has reached a mature state, and is ready for

implementation and operational use. The most recent version of the

OSI IS-IS protocol is contained in ISO DP 10589 [1]. The proposed

standard for using IS-IS for support of TCP/IP will therefore make

use of this version (with a minor bug correction, as discussed in

Annex B). We expect that future versions of this proposed standard

will upgrade to the final International Standard version of IS-IS

when available.

Comments should be sent to "isis@merit.edu".

Contents

1 Introduction: Overview of the Protocol

1.1 What the Integrated IS-IS offers

1.2 Overview of the ISO IS-IS Protocol

1.3 Overview of the Integrated IS-IS

1.4 Support of Mixed Routing Domains

Callon [Page 1]

RFC 1195 OSI ISIS for IP and Dual Environments December 1990

1.5 Advantages of Using Integrated IS-IS

2 Symbols and Abbreviations

3 Subnetwork Independent Functions

3.1 Exchange of Routing Information

3.2 Hierarchical Abbreviation of IP Reachability Information

3.3 Addressing Routers in IS-IS Packets

3.4 External Links

3.5 Type of Service Routing

3.6 Multiple LSPs and SNPs

3.7 IP-Only Operation

3.8 Encapsulation

3.9 Authentication

3.10 Order of Preference of Routes / Dijkstra Computation

4 Subnetwork Dependent Functions

4.1 Link Demultiplexing

4.2 Multiple IP Addresses per Interface

4.3 LANs, Designated Routers, and Pseudonodes

4.4 Maintaining Router Adjacencies

4.5 Forwarding to Incompatible Routers

5 Structure and Encoding of PDUs

5.1 Overview of IS-IS PDUs

5.2 Overview of IP-Specific Information for IS-IS

5.3 Encoding of IP-Specific Fields in IS-IS PDUs

6 Security Considerations

7 Author's Address

8 References

A Inter-Domain Routing Protocol Information

A.1 Inter-Domain Information Type

A.2 Encoding

B Encoding of Sequence Number Packets

B.1 Level 1 Complete Sequence Numbers PDU

B....