With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
nhrpServerStatTxRegisterNakCantServe
nhrp Server Statistic Tx Register Nak Cant Serve
1.3.6.1.3.9999.1.3.3.1.7
The number of NAKed NHRP Registration Replies transmitted by this server with the code 'Can't Serve This Address'.
Back to ibm-nhrp MIB page.
IPHost Network monitor allows you to monitor nhrpServerStatTxRegisterNakCantServe 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.