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Date:      Thu, 03 Mar 2022 16:36:50 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 262316] em(4) does not autonegotiate when fixed media is set
Message-ID:  <bug-262316-227-Yu77Cl8rUU@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-262316-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-262316-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D262316

J.R. Oldroyd <fbsd@opal.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|Not A Bug                   |---
             Status|Closed                      |Open

--- Comment #2 from J.R. Oldroyd <fbsd@opal.com> ---
Stefan, I believe you are mis-reading the standard.

You are quoting what the standard says to do in the event of autonegotiation
failure.  In that event, setting half-duplex is indeed the required behavio=
r.

However, citing from the same article that you cited, "The Ethernet standar=
ds
and major Ethernet equipment manufacturers recommend enabling autonegotiati=
on."

If both ends of a link are not under common administrative control, it may =
not
be possible to set both ends to matching modes.  Clearly, having a device
inform the other end what its configured capabilities are is preferable to
having a non-working link.

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