maximum-paths {ebgp | ibgp} number
The show ip bgp network command includes multipath information for that network.
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: The Dell Networking OS supports up to 255 characters in a set community statement inside
a route map.
NOTE: With the Dell Networking OS, you can create inbound and outbound policies. Each of the
commands used for filtering has in and out parameters that you must apply. In the system, 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.
To filter routes using prefix lists, use the following commands.
1. Create a prefix list and assign it a name.
CONFIGURATION mode
ip prefix-list prefix-name
2. Create multiple prefix list filters with a deny or permit action.
CONFIG-PREFIX LIST mode
seq sequence-number {deny | permit} {any | ip-prefix [ge | le] }
•ge: minimum prefix length to be matched.
•le: maximum prefix length to be matched.
For information about configuring prefix lists, refer to Access Control Lists (ACLs).
3. Return to CONFIGURATION mode.
CONFIG-PREFIX LIST mode
exit
4. Enter ROUTER BGP mode.
218 Border Gateway Protocol IPv4 (BGPv4)