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Multiple Active Routes
The interior gateway protocols (IGPs) compute equal-cost
multipath next hops, and internal BGP (IBGP) picks up these next hops.
When there are multiple, equal-cost next hops associated with a route,
the routing protocol process installs only one of the next hops in
the forwarding path with each route, randomly selecting which next
hop to install. For example, if there are 3 equal-cost paths to an
exit router and 900 routes leaving through that router, each path
ends up with about 300 routes pointing at it. This mechanism provides
load distribution among the paths while maintaining
packet ordering per destination.
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