With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
nhrpClientNhsInUse
nhrp Client Nhs In Use
1.3.6.1.3.9999.1.2.2.1.4
An indication of whether this NHS is in use by the NHC.
Back to NHRP-MIB MIB page.
IPHost Network monitor allows you to monitor nhrpClientNhsInUse 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.
