capture filter lacp encapsulated in ERSPAN

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I have a remote span and wants to capture only LACP frame, i'm not able to find the good capture filter.

I see a thread about capturing an ip inside a gre but i'm not familiar with that : https://osqa-ask.wireshark.org/questi...

I need your help to find the right capture using the mac source of the frame encapsulated in the GRE or any LACP inside the GRE or Slow protocols

Thanks