I'm seeing syslogs of this type:
/kernel: vlan MAC filter: <some multicast MAC> from port <port name> rejected
I've done some searches and can't seem to find an explanation of exactly what's going on here. Could someone direct me to where I could get some more information on these messages?
Those should be just debug messages... I am guessing you have logging set to any / any which can be bad.
Change it to any / info and you should only get meaningful messages.