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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.

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 mulipath is supported globally at [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 multipath option for a group or a specific BGP neighbor.

Options

multiple-as—Disable the default check requiring that paths accepted by BGP multipath must have the same neighboring AS.

vpn-unequal-cost equal-external-internal—Enable load-balancing in a Layer 3 VPN with unequal cost paths.

Required Privilege Level

routing—To view this statement in the configuration.

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