I've searched the forums and online, but haven't yet been able to work out a solution to the "unkown protocol drops" for my particular setup. I see these incrementing on on both Gigabit interfaces (first on the LAN int, then on the WAN int) on our 3825.
I have looked at the discussion here "http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Network%20Infrastructure&topic=LAN%2C%20Switching%20and%20Routing&topicID=.ee71a04&fromOutline=true&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.2cc0e9e3/0"
but haven't been able to get a decent reply from the router's snmp service.
Running a wireshark trace on the LAN interface, while monitoring the "unkown protocol drops" with "sh run | inc uknown" I notice the incrementation occur on the LAN interface but don't notice which protocol is to blame. A few seconds later, I notice the WAN interface's counter increase and wireshark shows ICMP V2 join/requests between router and a number of clients at the same time.
This immediately seems to lead to the conclusion that there are different IGMP version requests occuring. The problem is, I don't see this in the wireshark montioring.
Any ideas would be appreciated.
The setup is simply: 3825 WAN-g0/0, LAN-g0/1 to 3750 switch port VLAN'd.