Defines a method to use IGP ECMP routing information.
route-balance method distributes a set of destination networks
that share the same BGP Next Hop among available ECMP routes.
Each BGP network has one route submitted to IP RTM.
traffic-balance uses all avaiable IGP ECMP routes. Each BGP
network submitted to IP RTM number of times equal to number
IGP ECMP routes to BGP Next Hop.
This parameter is similar to wfBgpIbgpEcmpMethod but
is applicable only to EBGP peer connections. IBGP
peer connection selects ECMP method according to
wfBgpIbgpEcmpMethod value.