Dell C9000 series, Reference Manual

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To establish adjacencies and establish dynamic routing, enable routing on one or more
interfaces.
You can configure 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 — configures an IS-IS network entity title (NET) for the routing process.
• is-type — assigns a type for a given area.
isis circuit-type
Configure the adjacency type on interfaces.
C9000 Series
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 configured 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 configured 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-specific. 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
9.9(0.0) Introduced on the C9010.
Intermediate System to Intermediate System (IS-IS) 1075