[Bug 249427] Creating bHyve virtual machines cause network flaps Intel

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249427

            Bug ID: 249427
           Summary: Creating bHyve virtual machines cause network flaps
                    Intel
           Product: Base System
           Version: 12.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bhyve
          Assignee: virtualization at FreeBSD.org
          Reporter: unspam at crystalforest.tf

Created attachment 218042
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=218042&action=edit
dmesg output

Version: FreeBSD 12.2-BETA1

Server 1: Intel(R) PRO/1000 PCI-Express Network Driver
Server 2: Broadcom NetXtreme Gigabit Ethernet

I have two servers, one with intel (igb) and one with broadcom (bge).

I have also setup a bridge for bHyve but whenever I start or stop a bHyve
Virtual Machine on the server with the Intel Network Adapter, I get a brief
network flap

Server 1 - Intel

    igb3: link state changed to UP
    tap0: link state changed to DOWN
    igb3: link state changed to DOWN
    igb3: link state changed to UP

Server 2 - Broadcom

    tap0: link state changed to DOWN
    tap0: Ethernet address:
    tap0: promiscuous mode enabled
    nd6_dad_timer: cancel DAD on tap0 because of ND6_IFF_IFDISABLED.
    tap0: link state changed to UP

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