With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
alHardwareRamSize
ALTIGA Hardware Ram Size
1.3.6.1.4.1.3076.2.1.2.22.1.59
The amount of memory, in MB on the concentrator.
Back to ALTIGA-HARDWARE-STATS-MIB MIB page.
IPHost Network monitor allows you to monitor alHardwareRamSize on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.