With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
parIfMaxConn
par If Max Connection
1.3.6.1.4.1.351.130.2.1.1.6
This object specifies the maximum number of connections that can be configured over the interface.
Back to CISCO-WAN-PAR-MIB MIB page.
IPHost Network monitor allows you to monitor parIfMaxConn on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.