By default, a device can operate as both a Level 1 and Level 2 router. The following task changes the level supported from Level 1 and Level 2 to Level 1 for an IS-IS interface.
About this task
If you change the IS-IS type on an individual interface, the type you specify must also be specified globally. For example, if you globally set the type to Level 2 only, you cannot set the type on an individual interface to Level 1. The setting is accepted but does not take effect.
Procedure
-
Enter the
configure terminal command to access global configuration mode.
device# configure terminal
-
Enter the
interface ethernet command and specify an interface.
device(config)# interface ethernet 1/2
-
Enter the
isis circut-type command with the
level-1 parameter to configure a Level 1 adjacency for the interface.
device(config-if-e1000-1/2)# isis circut-type level-1
device(conf-if-eth-1/2)# isis circut-type level-1
Example
The following example configures a Level 1 adjacency on an IS-IS Ethernet interface.
device# configure terminal
device(config)# interface ethernet 1/2
device(conf-if-eth-1/2)# isis circut-type level-1
