Administrator Guide

Version Description
7.5.1.0 Introduced on the E-Series.
Usage Information
Configure a network entity title (the net command) to specify the area address and the router system ID.
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.
9.5(0.1) Introduced on the Z9500.
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 configure this command.
Routers in an IS-IS system must be configured as a Level 1-only, Level 1-2, or Level 2-only system.
Only configure interfaces as Level 1 or Level 2 on routers that are between areas (for example, a Level 1-2 router)
to prevent the software from sending unused hello packets and wasting bandwidth.
Intermediate System to Intermediate System (IS-IS) 799