Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 239

Use these commands in the following sequence, starting in the CONFIGURATION mode to filter routes using prefix lists. Step Command Syntax Command Mode Purpose 1 ip prefix-list prefix-name CONFIGURATION Create a prefix list and assign it a name. 2 seq sequence-number {deny | CONFIG-PREFIX LIST Create multiple prefix list filters with a deny permit} {any | ip-prefix [ge | le]} or permit action. ge: Minimum prefix length to be matched le: maximum prefix length to me matched Refer to the IP Access Control Lists (ACL), Prefix Lists, and Route-maps chapter for information on configuring prefix lists. 3 exit CONFIG-PREFIX LIST Return to the CONFIGURATION mode. 4 router bgp as-number CONFIGURATION Enter ROUTER BGP mode. 5 neighbor {ip-address | CONFIG-ROUTER-BGP Filter routes based on the criteria in the peer-group-name} configured prefix list. Configure the distribute-list prefix-list-name following parameters: {in | out} • ip-address or peer-group-name: enter the neighbor's IP address or the peer group's name. • prefix-list-name: enter the name of a configured prefix list. • in: apply the prefix list to inbound routes. • out: apply the prefix list to outbound routes. As a reminder, below are some rules concerning prefix lists: • If the prefix list contains no filters, all routes are permitted. • 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). • Once 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 the 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. Use these commands in the following sequence, starting in the CONFIGURATION mode to filter routes using a route map. Step Command Syntax Command Mode 1 route-map map-name [permit | CONFIGURATION deny] [sequence-number] Purpose Create a route map and assign it a name. Border Gateway Protocol IPv4 (BGPv4) | 239