Filtering Bgp Routes Using Route Maps; Filtering Bgp Routes Using As-Path Information - Dell S6100 Configuration Manual

• If none of the routes match any of the filters in the prefix list, the route is denied. This action is called an implicit deny. (If you want to
forward all routes that do not match the prefix list criteria, you must configure a prefix list filter to permit all routes. For example, you
could have the following filter as the last filter in your prefix list permit 0.0.0.0/0 le 32).
• After a route matches a filter, the filter's action is applied. No additional filters are applied to the route.
To view the BGP configuration, use the show config command in ROUTER BGP mode. To view a prefix list configuration, use the show
ip prefix-list detail or show ip prefix-list summary commands in EXEC Privilege mode.

Filtering BGP Routes Using Route Maps

To filter routes using a route map, use these commands.
1 Create a route map and assign it a name.
CONFIGURATION mode
route-map map-name [permit | deny] [sequence-number]
2 Create multiple route map filters with a match or set action.
CONFIG-ROUTE-MAP mode
{match | set}
For information about configuring route maps, see
3 Return to CONFIGURATION mode.
CONFIG-ROUTE-MAP mode
exit
4 Enter ROUTER BGP mode.
CONFIGURATION mode
router bgp as-number
5 Filter routes based on the criteria in the configured route map.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | peer-group-name} route-map map-name {in | out}
Configure the following parameters:
• ip-address or peer-group-name: enter the neighbor's IP address or the peer group's name.
• map-name: enter the name of a configured route map.
• in: apply the route map to inbound routes.
• out: apply the route map to outbound routes.
To view the BGP configuration, use the show config command in CONFIGURATION ROUTER BGP mode. To view a route map
configuration, use the show route-map command in EXEC Privilege mode.

Filtering BGP Routes Using AS-PATH Information

To filter routes based on AS-PATH information, use these commands.
1 Create a AS-PATH ACL and assign it a name.
CONFIGURATION mode
212 Border Gateway Protocol IPv4 (BGPv4)
Access Control Lists (ACLs).