traffic suspect: Excessive multicast/ broadcast

Hi Everyone,

I have a difficult situation in a Hotel, I’m having a slowness in internet link, then I put a RB to get logs, and below look what appears:

Interface logs:
May/06/2016 04:01:15 interface,warning inteface: ether5 excessive broadcasts/multicasts, probably a loop
May/06/2016 04:01:45 interface,warning inteface: ether5 excessive broadcasts/multicasts, probably a loop
May/06/2016 04:02:15 interface,warning inteface: ether5 excessive broadcasts/multicasts, probably a loop

I created a bridge and activated the firewall to log the traffic on the bridge, and when is logging the CPU usage go to 100%, Look below:

May/06/2016 07:29:16 firewall,info ##multicast### input: in:ether5(ether5) out:(none), src-mac 34:51:c9:38:ce:2b, dst-mac 33:33:00:00:00:fb, eth-proto 86dd, UDP, [fe80::10dc:f02:d454:e9e8]:5353->[ff02::fb]:5353, len 80

May/06/2016 07:29:16 firewall,info ##multicast### input: in:ether5(ether5) out:(none), src-mac 34:51:c9:38:ce:2b, dst-mac 33:33:00:00:00:fb, eth-proto 86dd, UDP, [fe80::10dc:f02:d454:e9e8]:5353->[ff02::fb]:5353, len 80

May/06/2016 07:29:16 firewall,info ##multicast### input: in:ether5(ether5) out:(none), src-mac 34:51:c9:38:ce:2b, dst-mac 33:33:00:00:00:fb, eth-proto 86dd, UDP, [fe80::10dc:f02:d454:e9e8]:5353->[ff02::fb]:5353, len 80

Can someone help me?

That’s multicast DNS traffic.

Check the source MAC address to see which host it’s from and what might be the cause.