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Filtering BGP Routing Updates ▪ BGP can potentially receive a high number of routing updates. To optimize BGP configuration, route filtering may be applied. ▪ Filtering ludes: Filter lists Prefix lists Route maps Filtering BGP Routing Updates ▪ ing traffic are subject to prefix lists, filter-lists, and route maps before they will be accepted into the BGP table. ▪ Similarly, outgoing routes must pass the outgoing route- maps, filter list, and prefix list before they will be transmitted to the neighbor. Filtering BGP Routing Updates ▪ If redistributing from an IGP into BGP, the routes must successfully pass any prefix list or route map applied to the redistribution process before the route is injected into the BGP table. Apply a BGP Filter To Routes ▪ Apply a filter list to routes from or to a neighbor. Router(config-router)# neighbor {ip-address | peer-group-name} filter-list access-list-number {in | out} Parameter Description ip-address IP address of the BGP neighbor. peer-group-name Name of a BGP peer group. access-list- number Number of an AS-path access list. in Access list is applied to ing routes. out Access list is applied to outgoing routes. nning BGP Filtering Using Prefix Lists ▪ When nning BGP filter configuration using prefix lists, the following steps should be ed: Def he traffic filtering requirements, luding the following: Filtering updates Controlling redistribution Configure the ip prefix-list statements. Apply the prefix list to filter inbound or outbound updates using the neighbor prefix-list router configuration command. Configure a Prefix List ▪ Define a prefix list. Router(config)# ip prefix-list {list-name | list-number} [seq seq-value] {deny |