RFC 2763 (rfc2763) - Page 3 of 5

Dynamic Hostname Exchange Mechanism for IS-IS

RFC 2763                    Dynamic Hostname               February 2000


   subset of it is strongly recommended. The content of this value is a
   domain name, see RFC 2181. The string is not null-terminated. The
   systemID of this router can be derived from the LSP identifier.

   If this TLV is present in a pseudo node LSP, then it should not be
   interpreted as the DNS hostname of the router.

4. Implementation

   The Dynamic Hostname TLV is optional. When originating an LSP, a
   router may decide to include this TLV in its LSP. Upon receipt of an
   LSP with the dynamic hostname TLV, a router may decide to ignore this
   TLV, or to install the symbolic name and systemID in its hostname
   mapping table.

   A router may also optionally insert this TLV in it's pseudo node LSP
   for the association of a symbolic name to a local LAN.

5. Security Considerations

   This document raises no new security issues for IS-IS. However, it is
   encouraged to use authentications for IS-IS routing protocol.  The
   authentication mechanism for IS-IS protocol is specified in [1] and
   it is being enhanced within IETF in [2].

6. Acknowledgments

   The authors would like to thank Enke Chen and Yakov Rekhter for their
   comments on this work.

7. References

   [1] ISO, "Intermediate system to Intermediate system routing
       information exchange protocol for use in conjunction with the
       Protocol for providing the Connectionless-mode Network Service
       (ISO 8473)," ISO/IEC 10589:1992.

   [2] Li, T., "IS-IS HMAC-MD5 Authentication", Work in Progress.













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