DELL S50V User Manual

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Border Gateway Protocol IPv4 (BGPv4)

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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: 

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.

The 

 

 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. 

For inbound and outbound updates the order of preference is: 

•

prefix lists (using 

 command)

•

AS-PATH ACLs (using 

 command)

•

route maps (using 

 command)

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

 

CONFIG-ROUTE-MAP

Sets weight for the route.

•

 range: 0 to 65535

 {

 | 

} 

CONFIG-ROUTER-
BGP

Enable multiple parallel paths.

•

 range: 1 to 16

•

Default is 1

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 

 and 

 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.