With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cagwReceivedDataBytes
Cisco's ASN Gateway Received Data Bytes
1.3.6.1.4.1.9.9.638.1.3.1.1.1.63
The number of data bytes received by the ASN-GW.
Back to CISCO-ASN-GATEWAY-MIB MIB page.
IPHost Network monitor allows you to monitor cagwReceivedDataBytes 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.