With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
alTelnetStatsSessionOutShDropOctets
ALTIGA Telnet Statistics Session Out Shell Dropped Octets
1.3.6.1.4.1.3076.2.1.2.11.2.1.22
The per session number of Telnet octets destined for the shell that were dropped during output processing since the system was booted.
Back to ALTIGA-TELNET-STATS-MIB MIB page.
IPHost Network monitor allows you to monitor alTelnetStatsSessionOutShDropOctets 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.