With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
nhrpClientStatRxErrInvalidExtension
nhrp Client Statistic Rx Error Invalid Extension
1.3.6.1.3.9999.1.2.3.1.21
The number of NHRP Error Indication packets received by this client with the error code 'Invalid Extension'.
Back to ibm-nhrp MIB page.
IPHost Network monitor allows you to monitor nhrpClientStatRxErrInvalidExtension 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.