This task explains
how to enable logging of adjacency state changes, alter the timers for IS-IS
adjacency packets, and display various aspects of adjacency state. Tuning your
IS-IS adjacencies increases network stability when links are congested. This
task is optional.
links, IS-IS sends only a single hello for Level 1 and Level 2, which means
that the level modifiers are meaningless on point-to-point links. To modify
hello parameters for a point-to-point interface, omit the specification of the
configurable in the interface submode apply only to that interface. By default,
the values are applied to both Level 1 and Level 2.
hello-password command can be used to prevent
adjacency formation with unauthorized or undesired routers. This ability is
particularly useful on a LAN, where connections to routers with which you have
no desire to establish adjacencies are commonly found.