Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 72)

44 Multi-Service IronWare Routing Configuration Guide
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Configuring BGP4 multipath load sharing
Syntax: [no] maximum-paths number | use-load-sharing
The number parameter specifies the maximum number of paths across which the device can
balance traffic to a given BGP4 destination. The number value range is 2 to 32 and the default is 1.
NOTE
The maximum number of paths supported by the BR-MLX-10Gx24-DM module is 16.
When the use-load-sharing option is used in place of the number variable, the maximum IP ECMP
path value is determined solely by the value configured using the ip load-sharing command.
Customizing BGP4 multipath load sharing
By default, when BGP4 Multipath load sharing is enabled, both IBGP and EBGP paths are eligible
for load sharing, while paths from different neighboring ASs 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 ASs.
To enable load sharing of IBGP paths only, enter the following command at the BGP4 configuration
level of the CLI.
Brocade(config-bgp)# multipath ibgp
To enable load sharing of EBGP paths only, enter the following command at the BGP4 configuration
level of the CLI.
Brocade(config-bgp)# multipath ebgp
To enable load sharing of paths from different neighboring ASs, enter the following command at the
BGP4 configuration level of the CLI.
Brocade(config-bgp)# 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 ASs.
By default, load sharing applies to EBGP and IBGP paths, and does not apply to paths from
different neighboring ASs.
Enhancements to BGP4 load sharing
Enhancements to BGP4 Load Sharing allows support for load sharing of BGP4 routes in IP ECMP
even if the BGP4 multipath load sharing feature is not enabled through the use-load-sharing option
to the maximum-paths command. Using the following commands, you can also set separate values
for IGMP and EGMP multipath load sharing.
To set the number of equal-cost multipath IBGP routes or paths that will be selected, enter
commands such as the following.
Brocade(config)# router bgp
Brocade(config-bgp)# maximum-paths ibgp
Syntax: [no] maximum-paths ibgp number