[Bug 229727] On install, Broadcom chipset doesn't receive DHCPOFFER

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229727

--- Comment #10 from Rodney W. Grimes <rgrimes at FreeBSD.org> ---
(In reply to Stephan Neuhaus from comment #8)
What concerns me is that you can get the dhcp request, the dhcp reply goes out,
the machine receives it, then in the process of setting the NIC values it drops
carrier on the link, and the switch goes back through a STP retrain process,
during which time your port looks dead.

Realize any time your port drops link status your going to have about a 50
second dead time for STP to go through the blocking(20s), listening(15s),
learning(15s) transition before it properly passes traffic again.  This is
usually long enough to cause all sorts of heartache.

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