With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cieSystemMtu
cie System Mtu
1.3.6.1.4.1.9.9.276.1.2.1
Global system MTU in octets. This object specifies the MTU on all interfaces. However, the value specified by cieIfMtu takes precedence for an interface, which means that the interface's MTU uses the value specified by cieIfMtu, if it is configured.
Back to CISCO-IF-EXTENSION-MIB MIB page.
IPHost Network monitor allows you to monitor cieSystemMtu 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.
