Re: Bridging two vlans on a single interface don't work ( kernel2.6.15, tg3 driver for Broadcom NetXtreme BCM5705M_2 )

The problem you may be running into could be caused by the switches 
broadcasting spanning tree packets. These will be broadcast back to the 
switch causing some confusion.
take a look at
http://lists.osdl.org/pipermail/bridge/2005-October/001116.html

a.gatta wrote:

> Dear List,
> I am experiencing problems bridging two vlans on a linux box running 
> debian.
>
> I have a single interface (eth0,Broadcom NetXtreme BCM5705M_2 with tg3 
> module).
>
> This interface has a trunk to a catalyst switch.
>
>
> I've created two virtual interface with vconfig:
>
> vconfig add eth0 608
> vconfig add eth0 609
>
> At this point all is fully functional, I am able to see traffic on 
> those virtual interfaces and if I give them the ip stack I can use them.
>
> Then I decided two bridge the two virtual interfaces.
>
> So I created a bridge with brctl :
>
> brctl addbr br0
>
> and I've added those virtual interfaces to the bridge :
>
> brctl addif br0 eth0.608
> brctl addif br0 eth0.609
>
> Last thing I enable all the interfaces :
>
> ifconfig br0 up
> ifconfig eth0.608 up
> ifconfig eth0.609 up
>
> The first thing I noticed is that I cannot see any traffic on br0 
> interface and also on the virtual interfaces.
>
> As far as I know the bridge code supports tagged packet but I am not 
> able to see any traffic on the interfaces.
>
> Moreover the tg3 module support natively vlan traffic.
>
> This is what I see on both br0 and virtual interfaces after I add them 
> to the bridge :
>
> 14:23:22.539413 00:0a:b7:23:61:97 > 01:00:0c:cc:cc:cd SNAP Unnumbered, 
> ui, Flags [Command], length 50
> 14:23:22.540865 00:0a:b7:23:61:97 > 01:00:0c:cc:cc:cd SNAP Unnumbered, 
> ui, Flags [Command], length 50
>
> Any ideas ?
>


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