ES-IS Configuration Guidelines

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End System-to-Intermediate System (ES-IS) provides the basic interaction between Connectionless Network Services (CLNS) hosts (end systems) and routers (intermediate systems). ES-IS allows hosts to advertise network services access point (NSAP) addresses to other routers and hosts attached to the network. Those routers can then advertise the address to the rest of the network using Intermediate System-to-Intermediate System (IS-IS). Routers use ES-IS to advertise their network entity title (NET) to hosts and routers attached to that network.

ES-IS routes are exported to Layer 1 Intermediate System-to-Intermediate System (IS-IS) by default. You can also export ES-IS routes into Layer 2 IS-IS by configuring a routing policy.

ES-IS is enabled only if either ES-IS or IS-IS is configured on the router. ES-IS must not be disabled. If ES-IS is not explicitly configured, the interface sends and receives only Intermediate System Hello (ISH) messages. If ES-IS is explicitly configured and disabled, the interface does not send or receive ES-IS packets. If ES-IS is explicitly configured and not disabled, the interface sends and receives ISH messages as well as ES-IS packets.

One of the interfaces configured for ES-IS must be configured with an ISO address used for hello messages. The ISO address family must be configured on an interface to support ES-IS on that interface.

For more information on configuring an address family on an interface, see the JUNOS Network Interfaces Configuration Guide.

To configure ES-IS properties on an interface, you include the following statements:



esis {

disable;



graceful-restart {
disable;
restart-duration seconds;
}





interface (interface-name | all) {

disable;

hello-interval seconds;

end-system-configuration-timer seconds;
}



preference preference;



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


}

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

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

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