With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cagwInstanceOperState
Cisco's ASN Gateway Instance Operation State
1.3.6.1.4.1.9.9.638.1.1.1.1.5
The current operational state of the ASN-GW.
Back to CISCO-ASN-GATEWAY-MIB MIB page.
IPHost Network monitor allows you to monitor cagwInstanceOperState on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.