MikroTik

I have 2 prism card as Ap Bridges and 1 ethernet. I have created a bridge interface. I bridge all 3 interface into one bridge interface.
when I monitor the root port is Unknown.
And wireless client couldn't ping to the mikrotik router.
What's wrong? Please help

There might a million reasons to why this doesnt work, perhaps post config?

Please, read the manual carefully.
You have probably gave the addresses to each interface, but after setting the bridge, only the bridge will keep the address!!!!
This is the only reason why you can't ping interfaces!!
Generally, bridging is not a good idea! You should do routing.

Cheers...

actually all IPs previously belonging to bridge interfaces would be as bridge IPs (you can assure yourself by taking a look at actual-interface under '/ip address print detail').
After the interfaces are put into the bridge there is some time needed (~30sec) for it to "learn" the network.

Edgars