I've been thinking about ways to enhance route failure detection since the asymmetric route failure detection doesn't do much for multi-hop configurations. The idea I had was to extend the lnet ping info to include route up/down status. This way peers could get route status of their next hop and use that information in selecting an appropriate next hop for future sends. Furthermore, in multi-hop configurations any bad hop on the route should eventually percolate to all peers that use that route. This isn't an ideal solution since it requires a wire protocol change, but I thought I would open this ticket to discuss further or maybe we can come up with another option.