if_vlan subinterfaces at boot

[Steve Bertrand]

Steve Bertrand wrote:
> Brooks Davis wrote:

>> On Mon, Jun 16, 2008 at 08:27:47PM -0400, Steve Bertrand wrote:
>>>> Is there any way to create, and assign addresses to a if_vlan 
>>>> sub-interface (eg: em6.3) via rc.conf at boot?

> I'll post back with the results in case anyone else here has been 
> interested in 'Cisco style' (as I for some reason refer to them as) 
> sub-ints on FreeBSD.

# cat /etc/rc.conf (snipped for brevity)

cloned_interfaces="em6.7"
ifconfig_em6_7="inet6 2607:f118:ddc0:8000::e19"

# reboot

# ifconfig (again, snipped for brevity)

em6: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
         options=b<RXCSUM,TXCSUM,VLAN_MTU>
         ether 00:60:e0:42:b1:7c
         media: Ethernet autoselect (1000baseTX <full-duplex>)
         status: active

em6.7: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
         inet6 2607:f118:ddc0:8000::e19 prefixlen 64
         ether 00:60:e0:42:b1:7c
         media: Ethernet autoselect (1000baseTX <full-duplex>)
         status: active
         vlan: 7 parent interface: em6

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Now, my next question is, can I have interface em6.7 operate on multiple 
vlans? ie, change the default behavior of the if_vlan interface's 
implicit designation to only vlan 7?

I want to have multiple prefixes (ie: subnets) within a single broadcast 
domain, but each prefix on its own sub-interface on the FreeBSD box, 
without designating a VLAN for each. (Please forgive the IPv6 test 
above, as it probably misguides my efforts... my tests at this point are 
purely to *hopefully* meet an IPv4 conceptual design goal).

Is this possible?

Steve