Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 228

www.dell.com | support.dell.com Regular Expressions as filters Regular expressions are used to filter AS paths or community lists. A regular expression is a special character used to define a pattern that is then compared with an input string. For an AS-path access list as shown in the commands above, if the AS path matches the regular expression in the access list, then the route matches the access list. 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. FTOS(config)#router bgp 99 FTOS(conf-router_bgp)#neigh AAA peer-group FTOS(conf-router_bgp)#neigh AAA no shut FTOS(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 FTOS(conf-router_bgp)#neigh 10.155.15.2 filter-list 1 in FTOS(conf-router_bgp)#ex FTOS(conf)#ip as-path access-list Eagle FTOS(config-as-path)#deny 32$ FTOS(config-as-path)#ex FTOS(conf)#router bgp 99 FTOS(conf-router_bgp)#neighbor AAA filter-list Eagle in FTOS(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 FTOS(conf-router_bgp)#ex FTOS(conf)#ex FTOS#show ip as-path-access-lists ip as-path access-list Eagle deny 32$ FTOS# 228 | Border Gateway Protocol IPv4 (BGPv4)