Administrator Guide

You can also use route maps to change this and other BGP attributes. For example, you can include the second command in a
route map to specify the next hop address.
● Disable next hop processing and configure the router as the next hop for a BGP neighbor.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | peer-group-name} next-hop-self
● Sets the next hop address.
CONFIG-ROUTE-MAP mode
set next-hop ip-address
Changing the WEIGHT Attribute
To change how the WEIGHT attribute is used, enter the first command. You can also use route maps to change this and other
BGP attributes. For example, you can include the second command in a route map to specify the next hop address.
● Assign a weight to the neighbor connection.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | peer-group-name} weight weight
○ weight: the range is from 0 to 65535.
The default is 0.
● Sets weight for the route.
CONFIG-ROUTE-MAP mode
set weight weight
○ weight: the range is from 0 to 65535.
To view BGP configuration, use the show config command in CONFIGURATION ROUTER BGP mode or the show
running-config bgp command in EXEC Privilege mode.
Enabling Multipath
By default, the software allows one path to a destination. You can enable multipath to allow up to 64 parallel paths to a
destination.
NOTE: Dell Networking recommends not using multipath and add path simultaneously in a route reflector.
To allow more than one path, use the following command.
The show ip bgp network command includes multipath information for that network.
● Enable multiple parallel paths.
CONFIG-ROUTER-BGP mode
maximum-paths {ebgp | ibgp} number
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 Networking OS supports up to 255 characters in a set community statement inside a route map.
NOTE: With 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 Dell 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)
172
Border Gateway Protocol IPv4 (BGPv4)