Multipath load sharing
Unlike IGP, BGP does not perform multipath load sharing by default. Therefore, the
maximum number of paths across which BGP can balance the traffic is set to 1 by default.
You can change this value by using the
maximum-paths command.
By default, when BGP4 multipath load sharing is enabled, both iBGP and eBGP paths are eligible for load sharing, while paths from different neighboring autonomous systems 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 autonomous systems.