IS-IS Configuration Guidelines

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



protocols {



isis {
clns-routing;

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;

max-areas seconds;
no-adjacency-holddown;

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-options {
delay milliseconds;
holddown milliseconds;
rapid-runs number;
}





topologies {
ipv4-multicast;
ipv6-multicast;
ipv6-unicast;
}





traffic-engineering {

disable;

ignore-lsp-metrics;



family inet;



shortcuts {

multicast-rpf-routes;
}


}





family inet6;

shortcuts;
}


}





traceoptions {
file filename <size size> <files number> <world-readable
| no-world-readable>;
flag flag <flag-modifier> <disable>;
}





interface (all | interface-name) {

disable;



bfd-liveness-detection {


detection-time {
threshold milliseconds;
}


minimum-interval milliseconds;
minimum-receive-interval milliseconds;
multiplier number;
no-adaptation;


transmit-interval {
threshold milliseconds;
minimum-interval milliseconds;
}


version (1 | automatic);
}



checksum;

csnp-interval (seconds | disable);

hello-padding (adaptive | loose | strict);



ldp-synchronization {
disable;
hold-time seconds;
}



lsp-interval milliseconds;

mesh-group (value | blocked);
no-adjacency-down-notification;

no-ipv4-multicast;

no-ipv6-multicast;

no-ipv6-unicast;

no-unicast-topology;

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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