Basic IS-IS configuration

For IS-IS to operate on routers, IS-IS must be explicitly enabled, and at least one area address and interface must be configured. If IS-IS is enabled but no area address or interface is defined, the protocol is enabled but no routes are exchanged. When at least one area address and interface are configured, then adjacencies can be formed and routes exchanged.

To configure IS-IS, perform the following tasks:

Enable IS-IS (specifying the instance ID of multi-instance IS-IS is to be enabled).
If necessary, modify the level capability on the global level (default is level-1/2).
Define area addresses.
Configure IS-IS interfaces.

Example: IS-IS default values configuration output


A:Dut-A>config>router>isis$ info detail
----------------------------------------------
        level-capability level-1/2
        no graceful-restart
        area-id 01
        no authentication-key
        no authentication-type
        authentication-check
        csnp-authentication
        lsp-lifetime 1200
        no export
        hello-authentication
        psnp-authentication
        traffic-engineering
        no reference-bandwidth
        no disable-ldp-sync
        ipv4-routing
spf-wait 10 1000 1000
lsp-wait 5 0 1
        level 1
            no authentication-key
            no authentication-type
            csnp-authentication
            external-preference 160
            hello-authentication
            preference 15
            psnp-authentication
            no wide-metrics-only
        exit
        level 2
            no authentication-key
            no authentication-type
            csnp-authentication
            external-preference 165
            hello-authentication
            preference 18
            psnp-authentication
            no wide-metrics-only
        exit
        no shutdown
----------------------------------------------
A:Dut-A>config>router>isis$