Configuring interface parameters

There are no interfaces associated with IS-IS by default. An interface belongs to all areas configured on a router. Interfaces cannot belong to separate areas. There are no default interfaces applied to the router IS-IS instance. You must configure at least one IS-IS interface in order for IS-IS to work.

To enable IS-IS on an interface, first configure an IP interface in the config>router> interface context. Then, apply the interface in the config>router>isis>interface context.

You can configure both the Level 1 parameters and the Level 2 parameters on an interface. The level-capability value determines which level values are used.

Note:

For point-to-point interfaces, only the values configured under Level 1 are used regardless of the operational level of the interface.

Example: Modified interface parameters

config>router# isis
    config>router>isis# level 1
    config>router>isis>level# wide-metrics-only
    config>router>isis>level# exit
    config>router>isis# level 2
    config>router>isis>level# wide-metrics-only
    config>router>isis>level# exit
    config>router>isis# interface ALA-1-2
    config>router>isis>if# level-capability level-2
    config>router>isis>if# mesh-group 85
    config>router>isis>if# exit
    config>router>isis# interface ALA-1-3
    config>router>isis>if# level-capability level-1
    config>router>isis>if# interface-type point-to-point
    config>router>isis>if# mesh-group 101
    config>router>isis>if# exit
    config>router>isis# interface ALA-1-5
    config>router>isis>if# level-capability level-1
    config>router>isis>if# interface-type point-to-point
    config>router>isis>if# mesh-group 85
    config>router>isis>if# exit
    config>router>isis# interface to-103
    config>router>isis>if# level-capability level-1/2
    config>router>isis>if# mesh-group 101
    config>router>isis>if# exit
    config>router>isis#

Example: Global and interface-level configuration output

A:ALA-A>config>router>isis# info
----------------------------------------------
        level-capability level-2
        area-id 49.0180.0001
        area-id 49.0180.0002
        area-id 49.0180.0003
        authentication-key "H5KBAWrAAQU" hash
        authentication-type password
        traffic-engineering
        level 1
            wide-metrics-only
        exit
        level 2
            wide-metrics-only
        exit
        interface "system"
        exit
        interface "ALA-1-2"
            level-capability level-2
            mesh-group 85
        exit
        interface "ALA-1-3"
            level-capability level-1
            interface-type point-to-point
            mesh-group 101
        exit
        interface "ALA-1-5"
            level-capability level-1
            interface-type point-to-point
            mesh-group 85
        exit
        interface "to-103"
            mesh-group 101
        exit
----------------------------------------------
A:ALA-A>config>router>isis#