* node. So from the options above, updating the next_node of the adj to
* be drop will work, but it relies on each graph node v4/v6/mpls, rewrite/
* arp/midchain always be valid w.r.t. a mis-match of adj type and node type
* node. So from the options above, updating the next_node of the adj to
* be drop will work, but it relies on each graph node v4/v6/mpls, rewrite/
* arp/midchain always be valid w.r.t. a mis-match of adj type and node type