With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
crVlanGroupVlansLow
cr Vlan Group Vlans Low
1.3.6.1.4.1.9.9.288.1.4.2.1.2
A string of octets containing one bit per VLAN for VLANs with VlanIndex value of 0 to 2047. Each octet within this value specifies a set of eight VLANs, with the first octet specifying VLANs 0 through 7, the second octet specifying VLANs 8 through 15, etc. Within each octet, the most significant bit represents the lowest numbered VLAN, and the least significant bit represents the highest numbered VLAN. Thus, each VLAN of the device is represented by a single bit within the value of this object. If that bit has a value of '1' then that VLAN is included in the group; the VLAN is not mapped to the group if its bit has a value of '0'.
Back to CISCO-RADIUS-MIB MIB page.
IPHost Network monitor allows you to monitor crVlanGroupVlansLow 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.