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What is this? is this spanning tree engaging? I assume it's not a port flap since the port isn't actually showing as up/down?

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Jan 22 18:33:55 STP: set port 3 to discarding
Jan 22 18:33:55 STP: set port 3 to learning
Jan 22 18:33:55 STP: set port 3 to forwarding
Jan 22 21:20:00 STP: set port 3 to discarding
Jan 22 21:20:00 STP: set port 3 to learning
Jan 22 21:20:00 STP: set port 3 to forwarding
Jan 22 21:45:05 STP: set port 3 to discarding
Jan 22 21:45:05 STP: set port 3 to learning
Jan 22 21:45:05 STP: set port 3 to forwarding
Jan 23 03:13:25 STP: set port 3 to discarding
Jan 23 03:13:25 STP: set port 3 to learning
Jan 23 03:13:25 STP: set port 3 to forwarding
Jan 23 03:19:37 STP: set port 3 to discarding
Jan 23 03:19:37 STP: set port 3 to learning
Jan 23 03:19:37 STP: set port 3 to forwarding
Jan 23 06:59:56 STP: set port 3 to discarding
Jan 23 06:59:56 STP: set port 3 to learning
Jan 23 06:59:56 STP: set port 3 to forwarding
Jan 23 08:52:26 STP: set port 3 to discarding
Jan 23 08:52:26 STP: set port 3 to learning
Jan 23 08:52:26 STP: set port 3 to forwarding
Jan 23 10:06:47 STP: set port 3 to discarding
Jan 23 10:06:47 STP: set port 3 to learning
Jan 23 10:06:47 STP: set port 3 to forwarding
Jan 23 10:24:09 STP: set port 3 to discarding
Jan 23 10:24:09 STP: set port 3 to learning
Jan 23 10:24:09 STP: set port 3 to forwarding
Jan 23 18:52:44 STP: set port 3 to discarding
Jan 23 18:52:44 STP: set port 3 to learning
Jan 23 18:52:44 STP: set port 3 to forwarding
Jan 24 07:41:19 STP: set port 3 to discarding
Jan 24 07:41:19 STP: set port 3 to learning
Jan 24 07:41:19 STP: set port 3 to forwarding
Jan 24 17:26:39 STP: set port 3 to discarding
Jan 24 17:26:39 STP: set port 3 to learning
Jan 24 17:26:39 STP: set port 3 to forwarding
Jan 24 17:57:12 STP: set port 3 to discarding
Jan 24 17:57:12 STP: set port 3 to learning
Jan 24 17:57:12 STP: set port 3 to forwarding


Seem like a loop detected by STP.