With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cvVrfOperStatus
Cisco Voice Vrf Operational Status
1.3.6.1.4.1.9.9.711.1.1.1.1.4
Denotes whether a VRF is operational or not. A VRF is up(1) when at least one interface associated with the VRF, which ifOperStatus is up(1). A VRF is down(2) when: a. There does not exist at least one interface whose ifOperStatus is up(1). b. There are no interfaces associated with the VRF.
Back to CISCO-VRF-MIB MIB page.
IPHost Network monitor allows you to monitor cvVrfOperStatus 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.