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Configuring an ISO System Identifier for the Router

For IS-IS to operate on the router, you can optionally configure a system identifier (system ID). The system identifier is commonly the media access control (MAC) address or the IP address expressed in binary-coded decimal (BCD).

If you do not statically map the hostname, the mapping is generated dynamically, based on the system host-name. If you omit the static-host-mapping hostname sysid statement, the IS-IS system ID is dynamically generated from the host portion of the ISO address configured on the loopback interface (lo0) and is mapped to the host-name statement configured at the [edit system] hierarchy level. Run the show isis hostname command to view the mappings.

To configure an International Organization for Standardization (ISO) system ID, include the sysid statement at the [edit system static-host-mapping hostname] hierarchy level:

hostname is the name specified by the host-name statement at the [edit system] hierarchy level.

system-identifier is the ISO system identifier. It is the 6-byte system ID portion of the IS-IS network service access point (NSAP). We recommend that you use the host’s IP address represented in BCD format. For example, the IP address is 1921.6800.1077 in BCD.