With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvsVSLPortRxBadSwitchIdPkts
cvs VSL Port Rx Bad Switch Id Packets
1.3.6.1.4.1.9.9.388.1.3.3.1.11
The number of received packets with bad switch IDs information for the port.
Back to CISCO-VIRTUAL-SWITCH-MIB MIB page.
IPHost Network monitor allows you to monitor cvsVSLPortRxBadSwitchIdPkts on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.