Command Reference Guide

3Com Router 5000 Family and Router 6000 Family preference ● 251
Command Reference
preference
Purpose Use the preference command to configure the preference of IS-IS protocol.
Use the undo preference command to restore the default value.
Syntax preference value
undo preference
Parameters value
Specifies the preference. Valid values are 1 to 255.
If no value is specified, the default value is 15.
Example Configure the preference of IS-IS as 25.
[3Com -isis] preference 25
View This command can be used in the following views:
■ IS-IS view
Description Several dynamic routing protocols could run simultaneously on a router. In this case,
there is an issue of sharing and selecting the routing information among all the
routing protocols. The system sets a preference for each routing protocol. When
various routing protocols find the route to the same destination, the protocol with the
higher preference will take effect.