With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
nhrpNextHopResInternetworkAddrType
nhrp Next Hop Resolution Internetwork Address Type
1.3.6.1.3.9999.1.1.1.1.1
The internetwork layer address type of this Next Hop Resolution Cache entry. The value of this object indicates how to interpret the values of nhrpNextHopResDestAddr and nhrpNextHopResNextHopAddr.
Back to ibm-nhrp MIB page.
IPHost Network monitor allows you to monitor nhrpNextHopResInternetworkAddrType on IBM device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring IBM switches right now.