Configures the type of adjacency desired for the
specified interface. The no version resets
the circuit type to level 1 and level 2.
Options
level-1—Establishes a level 1 adjacency if there
is at least one area address in common between this router and its
neighbors
level-1-2—(default) Establishes a level 1 and 2
adjacency if the neighbor is also configured as a level 1-2 router
and there is at least one area in common. If there is no area in common,
a level 2 adjacency is established.
level-2-only—Establishes a level 2 adjacency on
the circuit. If the neighboring router is a level 1 only router, no
adjacency will be established.
