With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnfCIMinSourceMask
cnf CI Min Source Mask
1.3.6.1.4.1.9.9.387.1.1.2.1.8
Source route's minimum configured mask bits. This is used to configure the minimum mask for Router Based Aggregation (RBA). Minimum masking capability is available only if RBA is enabled. A value of 0 indicates that this object is not applicable to this cache type.
Back to CISCO-NETFLOW-MIB MIB page.
IPHost Network monitor allows you to monitor cnfCIMinSourceMask 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.