I have a routed network no bridging and in my network which is 100% MT,
I noticed with just two 493Ah boards,
One (running OS 5.6) has/had on test at the moment was reporting every few days loss of ospf route to a ptp link on one port /30 and after a while the 493 would lose connectivity but strange login from the wlan side to the ptp 433ah and winbox would display no connectivity (R) on Ethernet port 1 which is also POE (24volts), replaced the rj45 connectors both ends but still after a few days ospf + lose connectivity?
Second was running OS 3.30 had a sudden loss of connectivity to the wlan side of a ptp, after several reboots and checking still no connectivity so I upgraded this 493 to 5.6 and still no luck, so I just disabled wireless package as it’s not used in the 493 and would you believe connectivity issue disappeared – strange as I always thought that disabling un-used packages would just improve performance but in this case it solved a connectivity issue, it remains if disabling wireless on the first one will solve the ospf issue.