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Routing & Switching · Advanced

BGP Multipath

Allowing BGP to install multiple equal paths for a prefix for load sharing.

Definition

BGP normally installs one best path. maximum-paths (eBGP) and maximum-paths ibgp allow multiple paths that tie on attributes through the IGP metric step. Paths from different neighboring ASes require bgp bestpath as-path multipath-relax.

Example

maximum-paths 4 ; maximum-paths ibgp 4

Exam tip

BGP multipath still selects one best path for advertisement; extra paths are only for forwarding.

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