ECMP: Prefer local forwarding next-hops over remote next-hops

You can have equal cost multi-path (ECMP) traffic flows prefer local forwarding next-hops over remote ones. This feature supports BGP prefixes that are directly reachable with IPv4 MPLS ECMP next-hops. Use ecmp-local-bias to direct ECMP traffic towards local links, for example, to ensure that the overall load on the fabric is reduced.