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Use Route Maps and Other Filters to Filter and Alter BGP and OSPF Routes | Page 13
BGP: Configuring Distribute Filters
Filter out a range of prefix lengths
This example demonstrates the effect of the exact parameter in the ACL by discarding all
routes to 52.0.0.0 with prefix lengths of 4 or greater.
3. Renew the route exchange by shutting down the neighbor, then bring it up again.
awplus(config-router)#
neighbor 45.45.45.46 shutdown
awplus(config-router)#
neighbor 45.45.45.46 no shutdown
4. Check that the IP route table no longer includes 52.0.0.0/8.
awplus(config-router)#
do show ip route
Codes: C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
* - candidate default
B 45.0.0.0/8 [20/0] via 45.45.45.46, vlan1, 00:00:14
C 45.45.45.0/24 is directly connected, vlan1
C 64.0.0.0/4 is directly connected, vlan64
1. Remove the existing ACL..
awplus(config)#
no access-list standard list1
2. Shut down the neighbor, and then bring it up again.
awplus(config-router)#
neighbor 45.45.45.46 shutdown
awplus(config-router)#
neighbor 45.45.45.46 no shutdown