I am using an ethernet backhaul and I noticed that the "Undersize" counter is incrementing on the switchports associated with the Deco's:

Port        Align-Err    FCS-Err   Xmit-Err    Rcv-Err UnderSize

Gi1/0/1             0          0          0          0      7280

Gi1/0/3             0          0          0          0       123

Gi1/0/13            0          0          0          0        97

Gi1/0/25            0          0          0          0        51

sw1#sh int gi1/0/3 controller  

   "abreviated display"                  13049 Valid frames, too small

This means the frames are bellow the smallest byte allowed but pass the FCS.

I'm wonering if this is related to the ieee 1905.1 backhaul that used by the Decos over Ethernet.