Ecmp Considerations - Alcatel-Lucent 7450 Configuration Manual

Weighted Load Balancing IGP, BGP, and Static Route Prefix Packets over IGP Shortcut

ECMP Considerations

The weight assigned to an LSP impacts only the forwarding decision, not the routing decision. In
other words, it does not change the selection of the set of ECMP tunnel next-hops of a prefix when
more next-hops exist than the value of the router ecmp option. This selection continues to follow
the algorithm used in the IGP shortcut feature.
Once the set of tunnel next-hops is selected, the LSP weight is used to modulate the amount of
packets forwarded over each next-hop.
Page 56 7450 ESS Router Configuration Guide