Hello,   That is completely normal.  At some point the carrier was lost for that port on the active controller.  This EQL model has the ability through an internal bus access the physical port on the passive. It's a "port failover" feature.  The passive controller isn't actually handling any traffic.  It's not possible to do so as the passive controller does not have access to the drives or volumes.    You can proceed without concern.  If you are still under contract you should consider upgrading the firmware to 10.0.3.   Regards,  Don 
We stumbled upon an issue that has us scratching our heads.  We were getting ready to move the 10Gb cables on the standby controller to a new set of switches, but eth1 was showing activity on that controller.  I'll attempt to post a couple images, but essentially it looks like this: Controller 0 = secondary   f/w: v9.1.4   boot time: 7/22/2021Controller 1 = primary   f/w: v9.1.4   boot time: 6/1/2021 eth0   10Gbps   status = up   controller = primaryeth1   10Gbps   status = up   controller = secondary   Since we didn't think it was possible to have both controllers with activity at the same time, can someone help explain what we're seeing?  We ended up pulling the eth1 cable from the primary controller (since it didn't show any activity), and sure enough, it didn't miss a beat/ping. [IMAGE] [IMAGE]
eth1 active on secondary controller on PS6210