Can these scale down and connect to a 1gb gbic?

Two of our four nexus boxes are reporting 50% CPU utilization for the SNMP daemon alone.  We tried removing the community string and narrowing the SNMP ACL down to only one box but it's still pegged.  Ran a debug and this is the output - any thoughts...

Found this on Cisco's website:At the global level, you can enable BPDU filtering on Port Fast-enabled interfaces by using thespanning-tree portfast bpdufilter default global configuration command. This command preventsinterfaces that are in a Port Fa...

Since Cisco doesn't allow the CST root to be outside the region when interacting with a PVST+ switch, does that also mean that only one MST region can be presesnt? (imagine MST region A connected to MST region C through region B which  only runs PVST...