This tutorial describes one approach of monitoring the patch compliance of network devices. The method is simple: Our network devices are already configured for SNMP monitoring. We are getting the usual performance and availability indicators using ping, load, memory and environment checks (power, fans OK). By leveraging the existing SNMP configuration of Nagios, we can receive the Cisco OS version (IOS, ASA, PIX) through the SNMPv2 MIB’s “sysDescr” parameter. This parameter is meant to be:

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