3Com Switch 7750 Configuration Guide

336 CHAPTER 35: IS-IS CONFIGURATION
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■ 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.
Configuring Route
Filtering
IS-IS can filter received routes and advertised routes based on ACL numbers.
Configuring received route filtering
Configuring IS-IS to filter the routes advertised by other routing protocols
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■ 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.
Table 258 Configure route redistribution
Operation Command Description
Enter system view system-view -
Enter IS-IS view isis [ tag ] Required
Enable route
redistribution from
another routing protocol
import-route protocol [ allow-ibgp ] [ cost
value | type { external | internal } | [ level-1 |
level-1-2 | level-2 ] | route-policy
route-policy-name ]*
Optional
By default, no
route
redistribution is
configured.
Table 259 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.
Table 260 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.