Brocade Communications Systems Layer 3 Routing Configuration ICX 6650 - Manual (Page 325)

Brocade ICX 6650 Layer 3 Routing Configuration Guide 307
53-1002603-01
Optional BGP4 configuration tasks
To change the maximum number of shared paths, enter commands such as the following.
Brocade(config)#router bgp
Brocade(config-bgp-router)#maximum-paths 4
Brocade(config-bgp-router)#write memory
Syntax: [no] maximum-paths num
The num parameter specifies the maximum number of paths across which the Layer 3 switch can
balance traffic to a given BGP4 destination. You can change the maximum number of paths to a
value from 2 through 4. The default is 1.
Customizing BGP4 load sharing
By default, when BGP4 load sharing is enabled, both IBGP and EBGP paths are eligible for load
sharing, while paths from different neighboring autonomous systems are not eligible. You can
change load sharing to apply only to IBGP or EBGP paths, or to support load sharing among paths
from different neighboring autonomous systems.
To enable load sharing of IBGP paths only, enter the following command at the BGP configuration
level of the CLI.
Brocade(config-bgp-router)#multipath ibgp
To enable load sharing of EBGP paths only, enter the following command at the BGP configuration
level of the CLI.
Brocade(config-bgp-router)#multipath ebgp
To enable load sharing of paths from different neighboring autonomous systems, enter the
following command at the BGP configuration level of the CLI.
Brocade(config-bgp-router)#multipath multi-as
Syntax: [no] multipath ebgp | ibgp | multi-as
The ebgp | ibgp | multi-as parameter specifies the change you are making to load sharing:
• ebgp – Load sharing applies only to EBGP paths. Load sharing is disabled for IBGP paths.
• ibgp – Load sharing applies only to IBGP paths. Load sharing is disabled for EBGP paths.
• multi-as – Load sharing is enabled for paths from different autonomous systems.
By default, load sharing applies to EBGP and IBGP paths, and does not apply to paths from
different neighboring autonomous systems.
Specifying a list of networks to advertise
By default, the router sends BGP4 routes only for the networks you identify using the network
command or that are redistributed into BGP4 from RIP or OSPF. You can specify up to 600
networks.
To specify a network to be advertised, use either of the following methods.
NOTE
The exact route must exist in the IP route table before the Layer 3 switch can create a local BGP
route.