# isis circuit-type

#### Syntax

isis circuit-type [ level-1 | level-1-2 | level-2-only ]

no isis circuit-type

#### Release Information

Command introduced before JunosE Release 7.1.0.

#### Description

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.

#### Mode

Interface Configuration, Subinterface Configuration