Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide
Chapter 4 Integrated IS-IS Configuration Commands
3Com Corporation
4-18
Parameter
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.
Description
Use the isis circuit-level command to configure the link adjacency relationship.
Use the undo isis circuit-level command to restore the default setting.
By default, you can configure both Level-1 and Level-2 adjacency on the interface.
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.
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
4.1.21 isis cost
Syntax
isis cost value [ level-1 | level-2 ]
undo isis cost [ level-1 | level-2 ]
View
Interface view