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Use Route Maps and Other Filters to Filter and Alter BGP and OSPF Routes | Page 19
BGP: Configuring AS Path Filters
Explicitly include
a neighbor
4. 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
5. Check that the IP route table does not have the BGP routes from the AlliedWare
neighbor in AS 34568 any more.
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
C 45.45.45.0/24 is directly connected, vlan1
C 64.0.0.0/4 is directly connected, vlan64
6. Add an entry to the an AS path access list that explicitly includes AS 34568.
awplus(config)#
ip as-path access-list list1 permit 34568
7. 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
8. Check that the IP route table has the BGP routes from the AlliedWare neighbor in
AS 34568 again.
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, 00:00:03
C 45.45.45.0/24 is directly connected, vlan1
B 52.0.0.0/8 [20/0] via 45.45.45.46, vlan1, 00:00:03
C 64.0.0.0/4 is directly connected, vlan64