With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dsgIfClassDestPortEnd
dsg If Class Dest Port End
This is the inclusive higher bound of the transport-layer source port range that is to be matched.
Back to DSG-IF-MIB MIB page.
IPHost Network monitor allows you to monitor dsgIfClassDestPortEnd on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.