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Dynamic Hostname Resolution

The system identifier of the NSAP address identifies a node in a network. System operators often find symbolic hostnames to be easier to use and remember than the system identifier. However, a static mapping of hostname to system identifier requires every router to maintain a table of the mappings; each table must contain the hostnames and system identifiers of every router in the network. The static mapping must be managed by router operators, and every change or addition of a mapping requires all the tables to be updated. Consequently, the static tables are likely to become rapidly outdated.

The router supports dynamic resolution of hostnames to system identifiers. You can use the clns host command to map the hostname to the NSAP address, and therefore to the system ID. This mapping is inserted in the dynamic hostname type-length-value tuple (TLV type 137), and subsequently advertised when LSPs are transmitted. The value field contains the hostname, preferably the fully qualified domain name (FQDN) of the host, or a subset of the FQDN. You can display the TLV by issuing the show isis database detail command.

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