With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cagwStateGroup
Cisco's ASN Gateway State Group
1.3.6.1.4.1.9.9.638.2.2.2
These objects describe the state of the ASN GW.
Back to CISCO-ASN-GATEWAY-MIB MIB page.
IPHost Network monitor allows you to monitor cagwStateGroup 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.