Brocade TurboIron 24X Series Configuration Guide - Manual (Page 718)

684 Brocade TurboIron 24X Series Configuration Guide
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Optional configuration tasks
If an IGP path used by a BGP4 next-hop route path installed in the IP route table changes, then the
BGP4 paths and IP paths are adjusted accordingly. For example, if one of the OSPF paths to reach
the BGP4 next hop goes down, the software removes this path from the BGP4 route table and the
IP route table. Similarly, if an additional OSPF path becomes available to reach the BGP4 next-hop
router for a particular destination, the software adds the additional path to the BGP4 route table
and the IP route table.
Changing the maximum number of shared BGP4 paths
When IP load sharing is enabled, BGP4 can balance traffic to a specific destination across up to
four equal paths. You can set the maximum number of paths to a value from 1 – 4. The default is 1.
NOTE
The maximum number of BGP4 load sharing paths cannot be greater than the maximum number of
IP load sharing paths. To increase the maximum number of IP load sharing paths, use the ip load
sharing <num> command at the global CONFIG level of the CLI.
To change the maximum number of shared paths, enter commands such as the following.
TurboIron(config)#router bgp
TurboIron(config-bgp-router)#maximum-paths 4
TurboIron(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 – 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 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 BGP configuration
level of the CLI.
TurboIron(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.
TurboIron(config-bgp-router)#multipath ebgp
To enable load sharing of paths from different neighboring ASs, enter the following command at the
BGP configuration level of the CLI.
TurboIron(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.