With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ons15501TrapSeverity
ons15501 Trap Severity
1.3.6.1.4.1.1869.11.11.3.4.1.3
Provides the default severity level corresponding to the ons15501TrapTypeValue.
Back to ONS15501-MIB MIB page.
IPHost Network monitor allows you to monitor ons15501TrapSeverity 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.