Users Guide

To establish adjacencies and establish dynamic routing, enable routing on one or more interfaces.
You can congure only one IS-IS routing process to perform Level 2 routing. A level-1-2 designation
performs Level 1 and Level 2 routing at the same time.
Related Commands
• net — congures an IS-IS network entity title (NET) for the routing process.
• is-type — assigns a type for a given area.
isis circuit-type
Congure the adjacency type on interfaces.
Syntax
isis circuit-type {level-1 | level-1-2 | level-2-only}
To return to the default values, use the no isis circuit-type command.
Parameters
level-1 You can form a Level 1 adjacency if there is at least one common area address
between this system and neighbors. You cannot form Level 2 adjacencies on this
interface.
level-1-2 You can form a Level 1 and Level 2 adjacencies when the neighbor is also
congured as Level-1-2 and there is at least one common area, if not, a Level 2
adjacency is established. This setting is the default.
level-2-only You can form a Level 2 adjacencies when other Level 2 or Level 1-2 routers and
their interfaces are congured for Level 1-2 or Level 2. Level 1 adjacencies cannot
be established on this interface.
Defaults level-1-2
Command Modes INTERFACE
Command History
This guide is platform-specic. For command information about other platforms, refer to the relevant Dell
Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.7(0.0) Introduced on the S6000-ON.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.12.0 Introduced on the S4810.
8.3.11.1 Introduced on the Z9000.
Usage Information
Because the default establishes Level 1 and Level 2 adjacencies, you do not need to congure this command.
Routers in an IS-IS system must be congured as a Level 1-only, Level 1-2, or Level 2-only system.
Intermediate System to Intermediate System (IS-IS)
871