Still not fixed it, since about 5pm I’ve accrued pages and pages of error logs stating there is a loop.
come on MT!!!
So for fun here is a screen shot of my current log, note this is on a 1440p machine full window and maxed out to show how many errors come through;
And as it’s available I have taken an image from my cacti, these ports don’t even have anything plugged in!
Just spotted the RC16 so have upgraded to that.
Fingers crossed I can start professing my love for MikroTik again.
21:13 and we have an error. 19 minutes after upgrade. 
Just to add so far the error has occurred on ether10 which is my WAN interface with pppoe client on it! 
What’s the name of the UBNT router with SFP again?!?!?!
Had a message from support earlier. The good news is that they have now replicated this error how I am reporting it and they are hoping to fix it in the next few days.
I see RC19 is now out but no mention of RB3011 fix so I will wait until prompted by MT support to upgrade.
I have now tested with the v6.35rc21 version and still no errors, seems to be solved. I’ll report if the errors come back
Still not solved… Collisions etc.
Have you seen there is now RC26 as well as new stable version?
I’m waiting for MT support to tell me to use it before I update for fear of making it worse.
Rc26 also bugged
Have just installed RC29 and I’ve had about 5 minutes of no errors. Fingers crossed this is the fix.
Just had my first error. Looks like RC29 doesn’t contain the fix. 
So I’ve just had an email from MT support. I am being informed that hopefully they should have a fix this week for the above problem.
Fingers crossed.
Just had the email.
RC37 is the fix to this problem. I have just installed and await to see the fix.
I’m very happy to say that this is now sorted. No errors since upgrade to RC37.
Well done Tik support!
while it seems log messages has been fixed, there is still some problem with SNMP counters which shows lot of packets for Tx Multicast, Tx Collision, Rx FCS Errors - it doesn’t correspond with interface counters at all, maybe they’ll mixed in SNMP and show other values instead…
I am not seeing the same as this. My Cacti is now showing no traffic on disconnected interfaces where before it wasn’t.
snmp for traffic seems ok, problem is with ethernet stats - see attached comparism between console and SNMP
I use latest MIB (201604010000Z)
After updating my RB3011 to Router OS 6.35.1 (Firmware 3.27) I still have sporadic warnings “ether1 excessive broadcasts/multicasts, probably a loop”.
Hi Guys,
Has anyone had any luck getting to the bottom of this? I am experiencing this on a number of RB3011s
Thanks.
Have all been upgraded to the latest firmware available in the own ROS upgrade (System > Routerboard), and reset at least to no defaults? (if not, netinstalled)?