With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
nhrpServerInternetworkAddr
nhrp Server Internetwork Addr
1.3.6.1.3.9999.1.3.1.1.3
The value of the internetwork layer address of this server.
Back to NHRP-MIB MIB page.
IPHost Network monitor allows you to monitor nhrpServerInternetworkAddr on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.