Configuration manual

As seen in the following example, the expressions are displayed when using the show commands. To
view the AS-PATH ACL configuration, use the show config command in CONFIGURATION AS-PATH
ACL mode and the
show ip as-path-access-list command in EXEC Privilege mode.
For more information about this command and route filtering, refer to Filtering BGP Routes.
The following example applies access list Eagle to routes inbound from BGP peer 10.5.5.2. Access list
Eagle uses a regular expression to deny routes originating in AS 32. The first lines shown in bold create
the access list and filter. The second lines shown in bold are the regular expression shown as part of the
access list filter.
Example of Using Regular Expression to Filter AS Paths
Dell(config)#router bgp 99
Dell(conf-router_bgp)#neigh AAA peer-group
Dell(conf-router_bgp)#neigh AAA no shut
Dell(conf-router_bgp)#show conf
!
router bgp 99
neighbor AAA peer-group
neighbor AAA no shutdown
neighbor 10.155.15.2 remote-as 32
neighbor 10.155.15.2 shutdown
Dell(conf-router_bgp)#neigh 10.155.15.2 filter-list 1 in
Dell(conf-router_bgp)#ex
Dell(conf)#ip as-path access-list Eagle
Dell(config-as-path)#deny 32$
Dell(config-as-path)#ex
Dell(conf)#router bgp 99
Dell(conf-router_bgp)#neighbor AAA filter-list Eagle in
Dell(conf-router_bgp)#show conf
!
router bgp 99
neighbor AAA peer-group
neighbor AAA filter-list Eaglein
neighbor AAA no shutdown
neighbor 10.155.15.2 remote-as 32
neighbor 10.155.15.2 filter-list 1 in
neighbor 10.155.15.2 shutdown
Dell(conf-router_bgp)#ex
Redistributing Routes
In addition to filtering routes, you can add routes from other routing instances or protocols to the BGP
process. With the redistribute command, you can include ISIS, OSPF, static, or directly connected
routes in the BGP process.
To add routes from other routing instances or protocols, use any of the following commands in ROUTER
BGP mode.
• Include, directly connected or user-configured (static) routes in BGP.
ROUTER BGP or CONF-ROUTER_BGPv6_ AF mode
redistribute {connected | static} [route-map map-name]
Configure the map-name parameter to specify the name of a configured route map.
• Include specific ISIS routes in BGP.
ROUTER BGP or CONF-ROUTER_BGPv6_ AF mode
Border Gateway Protocol IPv4 (BGPv4)
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