With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
nhrpCacheRowStatus
nhrp Cache Row Status
An object that allows entries in this table to be created and deleted using the RowStatus convention.
Back to NHRP-MIB MIB page.
IPHost Network monitor allows you to monitor nhrpCacheRowStatus on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.