With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
ipv6IfReasmMaxSize
ipv6 If Reasm Max Size
1.3.6.1.2.1.55.1.5.1.5
The size of the largest IPv6 datagram which this entity can re-assemble from incoming IPv6 fragmented datagrams received on this interface.
Back to ibm-ipv6 MIB page.
IPHost Network monitor allows you to monitor ipv6IfReasmMaxSize on IBM device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring IBM servers right now.