With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cpcBufferType
cpc Buffer Type
1.3.6.1.4.1.9.9.602.1.3.1.1.1
Type of the buffer for a packet capture session. linear : captured packets will be kept in the buffer one after the other. If there is no available space in the buffer, packet capture session will stop and value of the corresponding instance of cpcSessionOperStatus is set to 'bufferFull'. circular: If there is no space to store a captured packet completely, the oldest packet in the buffer will be overwritten.
Back to CISCO-PACKET-CAPTURE-MIB MIB page.
IPHost Network monitor allows you to monitor cpcBufferType 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.