With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cD11HtPhyShortGIInTwentyEnabled
Cisco DOT11 High-Throughput Physical Short GI In Twenty Enabled
1.3.6.1.4.1.9.9.607.1.1.2.1.14
This object, when set to 'true', indicates that the Short Guard option is enabled for 20 MHz operation.
Back to CISCO-DOT11-HT-PHY-MIB MIB page.
IPHost Network monitor allows you to monitor cD11HtPhyShortGIInTwentyEnabled 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.