Changing The Weight Attribute; Enabling Multipath; Filtering Bgp Routes - Dell S4048T Configuration Manual

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.
Border Gateway Protocol IPv4 (BGPv4) 252