With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
alTelnetStatsSessionInNetPackets
ALTIGA Telnet Statistics Session In Net Packets
1.3.6.1.4.1.3076.2.1.2.11.2.1.6
The per session number of Telnet packets that were received from the network since the system was booted.
Back to ALTIGA-TELNET-STATS-MIB MIB page.
IPHost Network monitor allows you to monitor alTelnetStatsSessionInNetPackets on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.