3Com Switch 7750 Configuration Guide Guide

322 CHAPTER 35: IS-IS CONFIGURATION
Configuring received route filtering
Configuring IS-IS to filter the routes advertised by other routing protocols
n
■ The filter-policy import command filters only the IS-IS routes received from
neighbors. The routes that cannot pass the filtering will not be added to the
routing table.
■ The filter-policy export command only applies to the routes imported with
the import-route command. The filter-policy export command will not work
if you do not configure the import-route command to import non-IS-IS
routes.
■ If you do not specify which type of routes are to be filtered with the
filter-policy export command, all the routes imported with the import-route
command will be filtered.
Configuring Route
Leaking
Through route leaking, a Level-2 router can send the Level-1 area routing
information and Level-2 area routing information that it knows to a Level-1 router.
Configuring Route
Summarization
You can configure the routes having the same IP prefix as one summarized route.
Tabl e 242 Configure received route filtering
Operation Command Description
Enter system view system-view -
Enter IS-IS view isis [ tag ] Required
Set the policy for filtering
received routes
filter-policy acl-number
import
Required
By default, IS-IS does not filter
received routes.
Tabl e 243 Configure IS-IS to filter the routes advertised by other routing protocols
Operation Command Description
Enter system view system-view -
Enter IS-IS view isis [ tag ] Required
Set the policy for filtering the
routes advertised by other
protocols
filter-policy acl-number
export [ protocol ]
Optional
By default, IS-IS does not
receive the routes advertised
by other routing protocols.
Tabl e 244 Configure route leaking
Operation Command Description
Enter system view system-view -
Enter IS-IS view isis [ tag ] Required
Enable route leaking
import-route isis level-2
into level-1 [ acl acl-number
]
Optional
By default, a Level-2 router
sends no routing information
to a Level-1 area.