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Dell Configuration Guide for the S4048–ON System 9.14.2.6

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Filtering 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 (using a route map) to control which routes the BGP neighbor or peer group accepts and advertises. Prefix lists filter routes based on route and prefix length, while AS-Path ACLs filter routes based on the ASN. Route maps can filter and set conditions, change attributes, and assign update policies.
NOTE Dell EMC Networking OS supports up to 255 characters in a set community statement inside a route map.
NOTE You can create inbound and outbound policies. Each of the commands used for filtering has in and out parameters that you must apply. In Dell EMC Networking OS, 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 the neighbor distribute-list command)
  • AS-PATH ACLs (using the neighbor filter-list command)
  • route maps (using the neighbor route-map command)

Prior to filtering BGP routes, create the prefix list, AS-PATH ACL, or route map.

For configuration information about prefix lists, AS-PATH ACLs, and route maps, refer to Access Control Lists (ACLs).

NOTE When you configure a new set of BGP policies, to ensure the changes are made, always reset the neighbor or peer group by using the clear ip bgp command in EXEC Privilege mode.

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