I would suspect a good portion of these are run-away enterprise autodiscover
jobs. As for what to do? Obviously, education would help alot, but, we all
know how successful that is in this industry with the number of new folks
getting involved every day.
If I remember right, Proteon routers allowed you to specify what interfaces
would accept SNMP queries. You could do something of the same with
an access-list on a cisco thats not heavily used. I also believe that the
Cisco routers do allow you to apply an access list to your SNMP config,
but this won't prevent your router from receiving the request and expending
CPU trying to figure out what to do with it.
What do we do about it? Grumble. Make a phone call here and there if
it gets out of hand.
Chris