[Bug 207701] vlan interface over failover lagg has empty/00:00:00:00:00:00 mac/ether address

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207701

            Bug ID: 207701
           Summary: vlan interface over failover lagg has
                    empty/00:00:00:00:00:00 mac/ether address
           Product: Base System
           Version: 10.3-BETA2
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: freebsd-bugs at virtualtec.ch
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Created attachment 167713
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=167713&action=edit
comparison between 10.2-release and 10.3-prerelease dmesg

We configure some servers with two interfaces as follows:
- failover lagg0 on em0 and em1
- several vlans on lagg0

after upgrading our systems due to the openssl bug, they came up without
networking. The reason was the vlan interfaces on the lagg got configured
with empty mac addresses:

vlan10: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1496
        ether 00:00:00:00:00:00
        inet 10.0.1.11 netmask 0xffffff00 broadcast 10.0.1.255 
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect
        status: active
        vlan: 10 parent interface: lagg0

where as with RELEASE-10.2, this looked as follows:

vlan10: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1496
        ether 00:30:48:7f:29:74
        inet 10.0.1.11 netmask 0xffffff00 broadcast 10.0.1.255 
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect
        status: active
        vlan: 10 parent interface: lagg0

The lagg0 looks the same in both releases:

lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=4219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC,VLAN_HWTSO>
        ether 00:30:48:7f:29:74
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect
        status: active
        laggproto failover lagghash l2,l3,l4
        laggport: em0 flags=5<MASTER,ACTIVE>
        laggport: em1 flags=0<>


We're normally using a stripped own kernel config, but for this purpose
I deliberately booted with 10.2-RELEASE and created a 10.3-PRERELEASE at r296382
GENERIC kernel to have a verifiable configuration.

Our rc.conf snippet to configure the interfaces looks as follows (there
are more vlans configured than this):

cloned_interfaces="vlan10 lagg0"

ifconfig_em0="vlanhwtag up"
ifconfig_em1="vlanhwtag up"
ifconfig_lagg0="laggproto failover laggport em0 laggport em1 up"
ifconfig_vlan10="inet 10.0.1.11/24 vlan 10 vlandev lagg0 up"

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