I'm all new to Netapp and have tried configuring two lacp groups between each controller and two stacked Extreme Networks x670. During the initial configuration of the fas, we got some kind of loop which put out our production network for 30 minutes.
The lacp group is created on the Extreme Networks with the following command:
Enable sharing 1:39 grouping 1:39,2:39 lacp
Which means a layer 2 lacp based sharing where 1:39 is the lag and the ports are 1:39 and 2:39. Three vlans are configured for each lacp group. Speed is set to auto and whether lacp is active or passive is unknown but can be configured.
It turned out that our Extreme switch stack was incorrect configured - it lacked configuration af master-capability on the second stacking module. Apparently it affected the LACP functionality. After we got it straightened out everything worked like a charm