Command Reference Guide

3Com Router 5000 Family and Router 6000 Family isis circuit-level ● 185
Command Reference
isis circuit-level
Purpose Use the isis circuit-level command to configure the link adjacency
relationship.
Use the undo isis circuit-level command to restore the default setting.
Syntax isis circuit-level [ level-1 | level-1-2 | level-2 ]
undo isis circuit-level
Parameters level-1
Configures only Level-1 adjacency instead of Level-2
one on the current interface.
level-1-2
Configures both Level-1 and Level-2 adjacency on the
current interface.
level-2
Configures only Level-2 adjacency on the current
interface.
Default By default, you can configure both Level-1 and Level-2 adjacency on the interface.
Example When interface serial1/0/0 is connected with a non-backbone router in the same
area, you can set this interface as Level-1, prohibiting the sending and receiving of
Level-2 hello messages.
[3Com ] interface serial1/0/0
[3Com -Serial1/0/0] isis enable
[3Com -Serial1/0/0] isis circuit-level level-1
View This command can be used in the following views:
■ Interface view
Description If the local router is a Level-1-2 router and it is required to establish a correlation with
the peer router on a certain level (Level-1 or Level-2), this command can specify the
interface to send and receive hello messages of this level. Certainly, only one type of
hello message is sent and received on the point-to-point link. In this way, excessive
processing is avoided, and the bandwidth is saved.
Only when system type of IS-IS is Level-1-2, can the circuit level take effect.
Otherwise, take the level defined via
is-level command as the standard.
Related Command is-level