Cisco me 3400 Guia Do Programa

Beginning in privileged EXEC mode, follow these steps to apply a per-neighbor route map:

Use the no neighbor distribute-list command to remove the access list from the neighbor. Use the no 
neighbor route-map map-tag router configuration command to remove the route map from the 
neighbor.

Another method of filtering is to specify an access list filter on both incoming and outbound updates, 
based on the BGP autonomous system paths. Each filter is an access list based on regular expressions. 
(See the “Regular Expressions” appendix in the Cisco IOS Dial Technologies Command Reference, 
Release 12.2 for more information on forming regular expressions.) To use this method, define an 
autonomous system path access list, and apply it to updates to and from particular neighbors.

Beginning in privileged EXEC mode, follow these steps to configure BGP path filtering:

Enter global configuration mode.

router bgp autonomous-system

Enable a BGP routing process, assign it an AS number, and enter 
router configuration mode.

neighbor {ip-address | peer-group name} 
distribute-list {access-list-number | name} 
{in | out}

(Optional) Filter BGP routing updates to or from neighbors as 
specified in an access list. 

You can also use the neighbor prefix-list router 
configuration command to filter updates, but you cannot use 
both commands to configure the same BGP peer.

neighbor {ip-address | peer-group name} 
route-map map-tag {in | out}

(Optional) Apply a route map to filter an incoming or outgoing 
route.

end 

Return to privileged EXEC mode.

Verify the configuration.

(Optional) Save your entries in the configuration file.

Enter global configuration mode.

ip as-path access-list access-list-number 
{permit | deny} as-regular-expressions

Define a BGP-related access list.

router bgp autonomous-system

Enter BGP router configuration mode.

neighbor {ip-address | peer-group name} 
filter-list {access-list-number | name} {in | 
out | weight weight}

Establish a BGP filter based on an access list.

end 

Return to privileged EXEC mode.

show ip bgp neighbors [paths 
regular-expression]

Verify the configuration.

(Optional) Save your entries in the configuration file.