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Subject: [Bug 217374] tap(4) shall be full-duplex and have non-zero speed.
Date: Sun, 26 Feb 2017 15:01:26 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D217374

            Bug ID: 217374
           Summary: tap(4) shall be full-duplex and have non-zero speed.
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: snar@snar.spb.ru

Created attachment 180317
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D180317&action=
=3Dedit
patch for if_tap.c

For now tap(4) devices advertise itself as just 'ethernet autoselect',
without duplex or speed capabilities. This advertisement makes them
unable to be aggregated into lacp-based lagg(4):
- lacp code requires underlying interfaces to be full-duplex,
else interface will not participate in lacp at all[1]
- lacp code requires underlying interface to have non-zero speed,
else this interface can not be selected as active aggregator[2].

[1]:
https://svnweb.freebsd.org/base/stable/11/sys/net/ieee8023ad_lacp.c?revisio=
n=3D313038&view=3Dmarkup#l478
[2]:
https://svnweb.freebsd.org/base/stable/11/sys/net/ieee8023ad_lacp.c?revisio=
n=3D313038&view=3Dmarkup#l952

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