With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
faHAUnreachable
fa HA Unreachable
1.3.6.1.2.1.44.1.5.3.12
Total number of Registration Requests denied by foreign agent -- home agent unreachable (Codes 80-95).
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IPHost Network monitor allows you to monitor faHAUnreachable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.