With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
ipv6DiscardedRoutes
ipv6 Discarded Routes
1.3.6.1.2.1.55.1.10
The number of routing entries which were chosen to be discarded even though they are valid. One possible reason for discarding such an entry could be to free-up buffer space for other routing entries.
Back to ibm-ipv6 MIB page.
IPHost Network monitor allows you to monitor ipv6DiscardedRoutes 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.