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IS-IS Configuration Guidelines

To configure Intermediate System-to-Intermediate System (IS-IS), you include the following statements in the configuration: 

protocols {

    isis {

        disable;

        ignore-attached-bit;

        graceful-restart {

            disable;

            helper-disable;

            restart-duration seconds;

        }

        label-switched-path name level level metric metric;

        level level-number { 

            authentication-key key;

            authentication-type authentication;

            external-preference preference; 

            no-csnp-authentication;

            no-hello-authentication;

            no-psnp-authentication;

            preference preference; 

            prefix-export-limit number;

            wide-metrics-only; 

        }

        loose-authentication-check;

        lsp-lifetime seconds;

        no-authentication-check; 

        no-ipv4-routing;

        no-ipv6-routing;

        overload {

            advertise-high-metrics;

            <timeout seconds>;

        }

        reference-bandwidth reference-bandwidth;

        rib-group {

            inet group-name;

            inet6 group-name;

        }

        spf-delay milliseconds;

        topologies {

            ipv4-multicast;

            ipv6-multicast;

            ipv6-unicast;

        }

        traffic-engineering {

            disable;

            shortcuts;

        }

        traceoptions {

            file name <replace> <size size> <files number> <no-stamp> 

                <(world-readable | no-world-readable)>;

            flag flag <flag-modifier> <disable>; 

        }

        interface interface-name {

            disable; 

            bfd-liveness-detection {

                minimum-interval milliseconds;

                minimum-receive-interval milliseconds;

                minimum-transmit-interval milliseconds;

                multiplier number;

            }

            checksum;

            csnp-interval (seconds | disable);

            lsp-interval milliseconds; 

            mesh-group (value | blocked); 

            no-ipv4-multicast;

            no-ipv6-unicast;

            passive; 

            point-to-point;

            level level-number { 

                disable; 

                hello-authentication-key key;

                hello-authentication-type authentication;

                hello-interval seconds; 

                hold-time seconds; 

                ipv4-multicast-metric number;

                ipv6-multicast-metric number;

                ipv6-unicast-metric number;

                metric metric; 

                passive;

                priority number; 

                te-metric metric;

            }

        }

    }

}

For a list of hierarchy levels at which you can configure these statements, see the statement summary sections for these statements.

By default, IS-IS is enabled for Level 1 and Level 2 routers on all interfaces on which an International Standards Organization (ISO) address is configured.

This chapter discusses the following topics that provide information about configuring IS-IS:

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