I do not see what all this tracerouting has to do with ToS/DSCP but I can add that we have full support for ToS/DSCP in our local net and it works beautifully. We use the top 3 bits of the ToS/DSCP to split the traffic in 8 queues in a Queue Tree (MikroTik feature) on links with a defined bandwidth, and it is used in WiFi link equipment (Ubiquiti, MikroTik) to split the traffic in 4 queues typically (WMM). We mainly use EF (46) for voice, CS1 (8) for background traffic like backups, and have CS2 (16) for a priority slightly above that. Default 00 is above that priority.

I see no latency effects of running a long backup over the same links used for the repeater audio for our co-channel multi site repeaters. Of course DSCP only works as long as it is not abused to get priority over fellow hams. It is like using more power to wipe everyone else from the repeater... works until the others do it too.

Rob