Date: Sun, 22 Nov 2009 04:53:48 +0000 From: Tom Judge <tom@tomjudge.com> To: Josh Paetzel <josh@tcbug.org> Cc: "net@freebsd.org" <net@freebsd.org> Subject: Re: if_bridge as if_vlan parent Message-ID: <4B08C3DC.1080607@tomjudge.com> In-Reply-To: <A56A8D74-9E91-460C-9524-68D2F1650AC4@tcbug.org> References: <4B0825DD.3000702@tomjudge.com> <A56A8D74-9E91-460C-9524-68D2F1650AC4@tcbug.org>
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Josh Paetzel wrote:
> On Nov 21, 2009, at 11:39 AM, Tom Judge wrote:
>
>> Hi,
>>
>> I was why I get the following error when trying to create a vlan on top of if_bridge:
>>
>> # ifconfig bridge0 create
>> # ifconfig vlan2 vlan 2 vlandev bridge0
>> ifconfig: SIOCSETVLAN: Protocol not supported
>>
>>
>> And if there was/is any reason for this to not be supported.
>>
>> Thanks
>>
>
>
> You can create a bridge from a pair of vlan devices....
>
> # ifconfig vlan1 create
> # ifcconfig vlan2 create
> # ifconfig bridge0 create
> # ifconfig vlan1 vlan 1 vlandev em0
> # ifconfig vlan2 vlan 2 vlandev em0
> # ifconfig bridge0 addm vlan1 addm vlan2
>
> Is that more in line with what you want to do?
>
> I'm a little curious what problem set using a bridge as the parent of a vlan solves though.
>
>
You have the problem upside down.
I am trying to bridge 2 trunk ports on 2 separate switches with a
FreeBSD box, and I would like to access a number of tagged vlans on the
trunk with the FreeBSD box.
[sw1-1/g1]->[FBSD-em0]-[FBSD-bridge0]-[FBSD-em1]->[sw2-1/g1]
/ \
[FBSD-vlan2] [FBSD-vlan200]
So:
ifconfig em0 up
ifconfig em1 up
ifconfig bridge0 create
ifconfig bridge0 addm em0 stp em0 addm em1 stp em1 up
ifconfig vlan2 create
ifconfig vlan2 10.0.0.1/24 vlan 2 vlandev bridge0
ifconfig vlan200 create
ifconfig vlan200 10.9.9.1/24 vlan 200 vlandev bridge0
This will fail when I try to attach the if_vlan's to the if_bridge.
Tom
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