RFC 3786 (rfc3786) - Page 1 of 14
Extending the Number of Intermediate System to Intermediate System (IS-IS) Link State PDU (LSP) Fragments Beyond the 256 Limit
Alternative Format: Original Text Document
Network Working Group A. Hermelin
Request for Comments: 3786 Montilio Inc.
Category: Informational S. Previdi
M. Shand
Cisco Systems
May 2004
Extending the Number of
Intermediate System to Intermediate System (IS-IS)
Link State PDU (LSP) Fragments Beyond the 256 Limit
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 (2004). All Rights Reserved.
Abstract
This document describes a mechanism that allows a system to originate
more than 256 Link State PDU (LSP) fragments, a limit set by the
original Intermediate System to Intermediate System (IS-IS) Routing
protocol, as described in ISO/IEC 10589. This mechanism can be used
in IP-only, OSI-only, and dual routers.
Table of Contents
1. Introduction ................................................. 2
1.1. Keywords ............................................... 2
1.2. Definitions of Commonly Used Terms ..................... 2
1.3. Operation Modes ........................................ 3
1.4. Overview ............................................... 4
2. IS Alias ID TLV (IS-A) ....................................... 5
3. Generating LSPs .............................................. 6
3.1. Both Operation Modes ................................... 6
3.2. Operation Mode 1 Additives ............................. 8
4. Purging Extended LSP Fragments ............................... 10
5. Modifications to LSP handling in SPF ......................... 10
6. Forming Adjacencies .......................................... 11
7. Interoperating between extension-capable and non-capable ISs . 11
8. Security Considerations ...................................... 12
9. Acknowledgements ............................................. 12
Hermelin, et al. Informational