Dell Force10 C150 Configuration Manual page 254

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
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
show ip bgp network
The
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
• AS-PATH ACLs (using
• route maps (using
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)
Command Mode
CONFIG-ROUTE-MAP
Command Mode
ebgp ibgp
{ | } number CONFIG-ROUTER-
BGP
command includes multipath information for that network.
neighbor distribute-list
neighbor filter-list
neighbor route-map
Purpose
Sets weight for the route.
• range: 0 to 65535
weight
Purpose
Enable multiple parallel paths.
• number range: 1 to 16
• Default is 1
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