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Labeled Unicast Routes

When BGP receives a labeled route from a directly connected peer, BGP uses the MPLS major interface that is next to the peer IP interface to resolve the route's BGP next hop. If the MPLS major interface exists and is up, then the next hop is reachable.

When the received labeled route is not from a directly connected peer, BGP attempts to resolve the BGP indirect next hop of the route in the IP tunnel routing table. When the BGP indirect next hop is reachable, BGP adds the route to both the IP routing table and to the IP tunnel routing table. The route is added as a U-T (unicast-tunnel-usable) route.

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