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multipath (Protocols BGP)

 

Syntax

Hierarchy Level

Release Information

Statement introduced before Junos OS Release 7.4.

Statement introduced in Junos OS Release 9.0 for EX Series switches.

Statement introduced in Junos OS Release 11.3 for the QFX Series.

disable option introduced in Junos OS Release 18.1R1.

allow-protection option introduced in Junos OS Release 18.4R1.

Description

Allow load sharing among multiple EBGP paths and multiple IBGP paths. A path is considered a BGP equal-cost path (and will be used for forwarding) if a tie-break is performed. The tie-break is performed after the BGP route path selection step that chooses the next-hop path that is resolved through the IGP route with the lowest metric. All paths with the same neighboring AS, learned by a multipath-enabled BGP neighbor, are considered.

Note

BGP multiple path options must be consistent for all routes forming a BGP multiple path. If BGP multiple path options differ, the multiple path feature chooses a preference, and the multiple path feature might not function as intended.

Note

Starting in Junos OS Release 18.1, BGP multipath is supported globally at the [edit protocols bgp] hierarchy level. You can selectively disable multipath on some BGP groups and neighbors. Include disable at [edit protocols bgp group group-name multipath] hierarchy level to disable the multipath option for a group or a specific BGP neighbor.

Options

allow-protection Allows BGP multipath and protection to co-exist. When allow-protection is configured there may be a change in show route output: N+1 nexthop formation (N ecmp plus 1 backup paths).
disable Disable the multipath option either at the global level for BGP or for a specific group or neighbor and still allow multipath for other groups or neighbors. Before disabling multipath for specific groups or neighbors, ensure that you have enabled multipath at the global level, by configuring the multipath statement at the [edit protocols bgp] hierarchy level.
multiple-as Disable the default check requiring that paths accepted by BGP multipath must have the same neighboring AS.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.