With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cipIpFragFails
Cisco Channel Interface Processor Ip fragment Fails
1.3.6.1.4.1.9.9.32.1.1.1.1.19
The number of IP datagrams that have been discarded because they needed to be fragmented at this entity but could not be, e.g., because their Don't Fragment flag was set.
Back to CISCO-CIPTCPIP-MIB MIB page.
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