Dell Force10 S25N-S50N FTOS Configuration Guide FTOS 8.4.2.7 E-Series TeraScal - Page 254

www.dell.com | support.dell.com You can also use route maps to change this and other BGP attributes. For example, you can include the following command in a route map to specify the next hop address: Command Syntax set weight weight Command Mode CONFIG-ROUTE-MAP Purpose Sets weight for the route. • weight range: 0 to 65535 Enable multipath By default, the software allows one path to a destination. You can enable multipath to allow up to 16 parallel paths to a destination. Use the following command in the CONFIGURATION ROUTER BGP mode to allow more than one path. Command Syntax maximum-paths {ebgp | ibgp} number Command Mode CONFIG-ROUTERBGP Purpose Enable multiple parallel paths. • number range: 1 to 16 • Default is 1 The show ip bgp network command includes multipath information for that network. Filter BGP routes Filtering routes allows you to implement BGP policies. You can use either IP prefix lists, route maps, AS-PATH ACLs or IP Community lists (via a route map) to control which routes are accepted and advertised by the BGP neighbor or peer group. Prefix lists filter routes based on route and prefix length, while AS-Path ACLs filter routes based on the Autonomous System number. Route maps can filter and set conditions, change attributes, and assign update policies. Note: FTOS supports up to 255 characters in a set community statement inside a route map. Note: With FTOS, you can create inbound and outbound policies. Each of the commands used for filtering, has in and out parameters that must be applied. In FTOS, the order of preference varies depending on whether the attributes are applied for inbound updates or outbound updates. For inbound and outbound updates the order of preference is: • prefix lists (using neighbor distribute-list command) • AS-PATH ACLs (using neighbor filter-list command) • route maps (using neighbor route-map command) Prior to filtering BGP routes, you must create the prefix list, AS-PATH ACL, or route map to be used. 254 | Border Gateway Protocol IPv4 (BGPv4)