Dell S3048-ON, Configuration Manual

Page: 205 / 1036

If you do not use the
all
keyword, the next hop of only eBGP-learned routes is updated by the route reflector. If you use the
all
keyword, the next hop of both eBGP- and iBGP-learned routes are updated by the route reflector.
• Sets the next hop address.
CONFIG-ROUTE-MAP mode
set next-hop ip-address
If the
set next-hop
command is applied on the out-bound interface using a route map, it takes precedence over the
neighbor
next-hop-self
command.
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) 205