|
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
转自:杜松之家
|