Open MPI doesn't proscribe a specific network protocol for anything.  Indeed, 
each network transport uses their own protocols, headers, etc.  It's basically 
a "each Open MPI plugin needs to be able to talk to itself", and therefore no 
commonality is needed (or desired).
Which network and Open MPI transport are you looking to sniff?

--
Jeff Squyres
jsquy...@cisco.com

________________________________________
From: users <users-boun...@lists.open-mpi.org> on behalf of victor sv via users 
<users@lists.open-mpi.org>
Sent: Sunday, May 15, 2022 3:55 PM
To: users@lists.open-mpi.org
Cc: victor sv
Subject: [OMPI users] Network traffic packets documentation

Hello,

I would like to sniff the OMPI network traffic from outside the MPI application.

I was traversing the OpenMPI code and documentation, but I have not found any 
central point explaining MPI communications from the network point of view.

Please, is there any official documentation, or paper, or presentation or 
picture about MPI packet headers?

Sorry if this a basic question or if it was already answered.

Thanks in advance for your help!
BR,
VĂ­ctor.

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