With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
smonVlanIdStatsId
smon Vlan Id Stats Id
1.3.6.1.2.1.16.22.1.2.2.1.1
The unique identifier of the VLAN monitored for this specific statistics collection. Tagged packets match the VID for the range between 1 and 4094. An external RMON probe MAY detect VID=0 on an Inter Switch Link, in which case the packet belongs to a VLAN determined by the PVID of the ingress port. The VLAN to which such a packet belongs can be determined only by a RMON probe internal to the switch.
Back to SMON-MIB MIB page.
IPHost Network monitor allows you to monitor smonVlanIdStatsId on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.