With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
nhrpClientGroup
nhrp Client Group
1.3.6.1.3.9999.2.2.2
Objects that apply only to NHRP clients.
Back to NHRP-MIB MIB page.
IPHost Network monitor allows you to monitor nhrpClientGroup 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.