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

on den 03.05.2006 klokka 14:24 (+0200) skreiv a.gatta:
> 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 ?


Do you see the mac address of your switch on both of these vlans on the
cisco switch? A lot of (broken) switches will croak on traffic flowing
this way.