A、Autoroute causes the tunnel to be treated as a directly connected link to the head-end.

B、Autoroute causes the TE head-end to establish IGP adjacency with the tail-end over the tunnel.

C、Forwarding adjacency makes the TE head-end node advertise the Tunnel LSP into the IGP.

D、Forwarding adjacency supports unequal cost load balancing over multiple TE tunnels.