340 CHAPTER 29: IS-IS CONFIGURATION
information in the extended fragments. Mode-2 is recommended in a network
where all the routers that are in the same area and at the same routing level
support LSP fragment extension.
Dynamic host name mapping mechanism
The dynamic host name mapping mechanism provides the mapping between the
host names and the system IDs for the IS-IS routers. The dynamic host name
information is announced in the dynamic host name CLV of an LSP.
This mechanism also provides the mapping between a host name and the DIS of a
broadcast network, which is announced in a dynamic host name TLV of a
pseudonode LSP.
A host name is intuitively easier to remember than a system ID. After enabling this
feature on the router, you can see the host names instead of system IDs using the
display command.
Protocols and Standards
■ ISO 10589 ISO IS-IS Routing Protocol
■ ISO 9542 ES-IS Routing Protocol
■ ISO 8348/Ad2 Network Services Access Points
■ RFC 1195 - Use of OSI IS-IS for Routing in TCP/IP and Dual Environments
■ RFC 2763 - Dynamic Hostname Exchange Mechanism for IS-IS
■ RFC 2966 - Domain-wide Prefix Distribution with Two-Level IS-IS
■ RFC 2973 - IS-IS Mesh Groups
■ RFC 3277 - IS-IS Transient Blackhole Avoidance
■ RFC 3358 - Optional Checksums in ISIS
■ RFC 3373 - Three-Way Handshake for IS-IS Point-to-Point Adjacencies
■ RFC 3567 - Intermediate System to Intermediate System (IS-IS) Cryptographic
Authentication
■ RFC 3719 - Recommendations for Interoperable Networks using IS-IS
■ RFC 3786 - Extending the Number of IS-IS LSP Fragments Beyond the 256 Limit
■ RFC 3787 - Recommendations for Interoperable IP Networks using IS-IS
■ RFC 3847 - Restart signaling for IS-IS
IS-IS Configuration
Task List
Complete the following tasks to configure IS-IS:
Task Remarks
“Configuring IS-IS Basic Functions” on page 341 Required
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