Here are some commands that you can use to check the LAG. console>show interfaces counters port-channel 1 console# show interfaces detail port-channel 1 console# show interfaces status port-channel 1 I pulled these commands from the CLI guide. You may find some others in here useful. [URL] Spanning tree should not be disabled. 
How can I verify my LAG uplinks are working properly? Is there a command that shows its functioning correctly?  Should each Stack member be assigned its own IP address?  Should STP be turned off the LAG/Port-Channel Groups (no spanning-tree portfast)?  Also can you clarify what happens in a stack of switch if the master switch that goes down contains VLANS? It’s my understanding that the standby switch, if exists, will take over and take on the configuration. Does it actually move the VLANS to the standby switch or just act as a management point?  Thanks for your help. 
Dell 6248 Configuration Questions