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Could be the the topology data being collected for that device isn't being polled correctly. Download the demo for the Engineer's toolset and use the switchport mapper to view what topology data is being received.
So it looks like any of our switches configured in Brocade's IronStack topology ends up erroring out at least on the Switch Port Mapper tool. I am getting statistics and information on the ports through NPM, but it looks like there may an issue with the MIBs or with the information received from the switch that it doesn't know what to do with. Opening a ticket with SW.
After a few months of back and forth with support we've discovered that this is indeed a bug in the software that will have to be fixed. The SNMP data is being polled correctly, but not getting passed correctly to all the functions.