IS-IS Configuration Guidelines

To configure Intermediate System to Intermediate System (IS-IS), you include statements at the [edit protocols isis] hierarchy level of the configuration. For routing instances, include the statements at the [edit routing-instances routing-instance-name protocols isis]. You can 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; 

        }

        lsp-lifetime seconds;

        multicast-topology;

        no-authentication-check; 

        no-ipv4-routing;

        no-ipv6-routing;

        overload <timeout seconds>;

        reference-bandwidth reference-bandwidth;

        rib-group group-name;

        spf-delay milliseconds;

        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; 

            checksum;

            csnp-interval (seconds | disable);

            lsp-interval milliseconds; 

            mesh-group (value | blocked); 

            passive; 

            point-to-point;

            level level-number { 

                disable; 

                hello-authentication-key key;

                hello-authentication-type authentication;

                hello-interval seconds; 

                hold-time seconds; 

                metric metric; 

                passive;

                priority number; 

                te-metric metric;

            }

        }

    }

}

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

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

• Minimum IS-IS Configuration
• Configure IS-IS Authentication
• Configure Interface-Specific Properties
• Enable Checksum
• Configure the CSNP Interval
• Configure Mesh Groups
• Modify the Interface Metric
• Enable Wide Metrics for Traffic Engineering
• Configure Route Preferences
• Configure Prefix Export Limit
• Configure IS-IS Levels on an Interface
• Modify the LSP Interval
• Modify the LSP Lifetime
• Advertise Label-Switched Paths into IS-IS
• Configure the Router to Appear Overloaded
• Configure the SPF Delay
• Configure Graceful Restart
• IS-IS and Multipoint Configurations
• Configure Point-to-Point Interfaces
• Configure IS-IS Traffic Engineering Attributes
• Disable IS-IS on the Router
• Disable IPv4 Routing
• Disable IPv6 Routing
• Configure IS-IS Routing Policy
• Configure IS-IS Multicast Extensions
• Install Default Route To Nearest Level 1/Level 2 Router
• Trace IS-IS Protocol Traffic

See page "}" for an IS-IS configuration example.