With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
smonVlanIdStatsTotalPkts
smon Vlan Id Stats Total Packets
1.3.6.1.2.1.16.22.1.2.2.1.2
The total number of packets counted on this VLAN.
Back to SMON-MIB MIB page.
IPHost Network monitor allows you to monitor smonVlanIdStatsTotalPkts on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.