3Com 7757 Configuration Manual page 336

336 C 35: IS-IS C
HAPTER ONFIGURATION
n
Configuring Route
Filtering
n
Table 258 Configure route redistribution
Operation
Enter system view
Enter IS-IS view
Enable route
redistribution from
another routing protocol
For more information about route redistribution, refer to "IP Routing Policy
■
Configuration" on page 378.
The allow-ibgp keyword is used to redistribute iBGP routes. Because the
■
AS-PATH attribute of redistributed iBGP routes is discarded, routing loops may
occur. Therefore, use this keyword with caution.
IS-IS can filter received routes and advertised routes based on ACL numbers.
Configuring received route filtering
Table 259 Configure received route filtering
Operation
Enter system view
Enter IS-IS view
Set the policy for filtering
received routes
Configuring IS-IS to filter the routes advertised by other routing protocols
Table 260 Configure IS-IS to filter the routes advertised by other routing protocols
Operation
Enter system view
Enter IS-IS view
Set the policy for
filtering the routes
advertised by other
protocols
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.
Command
system-view
isis [ tag ]
import-route protocol [ allow-ibgp ] [ cost
value | type { external | internal } | [ level-1 |
level-1-2 | level-2 ] | route-policy
route-policy-name ]*
Command
system-view
isis [ tag ]
filter-policy acl-number import Required
Command
system-view
isis [ tag ]
filter-policy acl-number export
[ protocol ]
Description
-
Required
Optional
By default, no
route
redistribution is
configured.
Description
-
Required
By default, IS-IS does not filter
received routes.
Description
-
Required
Optional
By default, IS-IS does not
receive the routes advertised
by other routing protocols.