Hello - hopefully someone can help with my issue - I have bought the TP-LINK CPE510 with preconfig - I have changed the IP addresses to match our management Vlan, we want to use the device as a back up to our main fibre connection to another building, the devices link to each other via there wifi that all seems to work fine - but few seconds after opening the trunk ports on each side ( CISCO 9200 switches ) the whole network trys to route to these devices, unsure why, logs show all vlans flapping to the ports there connected too, I have tested this without the fibre plugged in same results - tested it with only 2 vlans allowed on truck - same results - tested it with as a access port instead of trunk - same results, dont know what im missing here can you help ? info below -

Settings -

Switches -