Reference Guide

Defaults Not configured.
Command Modes ROUTER ISIS
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.12.0 Introduced on the S4810.
Version 8.3.11.1 Introduced on the Z9000.
Version 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.
S4820T
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.
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