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Example: Disabling IS-IS on a Level

On SONET/SDH interface so-0/0/0, enable IS-IS for Level 1 only. With this configuration, tracing messages periodically indicate that IS-IS is creating Level 2 link-state PDUs. However, because IS-IS for Level 2 is disabled, these link-state PDUs are never distributed to neighboring routers.

protocols {
isis {
traceoptions {
file isis size 1m files 10;
flag spf;
flag lsp;
flag error;
}
interface so-0/0/0 {
level 2 {
disable;
}
}
}
}

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