With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
smonVlanIdStatsTotalOctets
smon Vlan Id Stats Total Octets
1.3.6.1.2.1.16.22.1.2.2.1.5
The total number of octets counted on this VLAN.
Back to SMON-MIB MIB page.
IPHost Network monitor allows you to monitor smonVlanIdStatsTotalOctets on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.
