With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rttMonHTTPStatsDNSRTTSum
Round Trip Time Monitor HTTP Stats DNSRTT Sum
1.3.6.1.4.1.9.9.42.1.3.4.1.9
The sum of RTT taken to perform DNS query within the HTTP operation.
Back to CISCO-RTTMON-MIB MIB page.
IPHost Network monitor allows you to monitor rttMonHTTPStatsDNSRTTSum 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.