[Bug 287150] bridge(4): VLAN subinterfaces on member interfaces break when net.link.bridge.member_ifaddrs=0

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287150

            Bug ID: 287150
           Summary: bridge(4): VLAN subinterfaces on member interfaces
                    break when net.link.bridge.member_ifaddrs=0
           Product: Base System
           Version: 14.3-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: zarychtam@plan-b.pwste.edu.pl

Today I upgraded one of the bhyve(8) hosts to a recent stable/14 build. Since
the oce(4) NIC (which is a bridge member) had neither a legacy IP address nor
an IPv6 address configured, I disabled the net.link.bridge.member_ifaddrs
sysctl (which still defaults to 1 on stable/14).

After rebooting, all VLAN subinterfaces of oce(4) came up, but they were unable
to send or receive traffic. Re-enabling net.link.bridge.member_ifaddrs=1
resolved the issue.

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