Re: [Xen-devel] virbr0/bridge: No such file or directory, rhel6 bridge-utils IGMP snooping

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sat, Aug 27, 2011 at 02:50:39PM +0300, Pasi Kärkkäinen wrote:
> On Fri, Aug 26, 2011 at 04:54:34PM +0300, Pasi Kärkkäinen wrote:
> > On Fri, Aug 26, 2011 at 02:25:57PM +0300, Pasi Kärkkäinen wrote:
> > > On Fri, Aug 26, 2011 at 01:13:14AM -0500, Scott Meyers wrote:
> > > > 
> > > > This is fresh install of CentOS v6 and Xen v4.1 on a new Dell server 
> > > > following the tutorial posted at: 
> > > > http://wiki.xensource.com/xenwiki/RHEL6Xen4Tutorial
> > > >  
> > > > Every thing went just fine, yet virbr0 won't work and when I run brctl 
> > > > show I get the following error message:
> > > >  
> > > > [root@pe1950 ~]# brctl show
> > > > bridge name     bridge id               STP enabled     interfaces
> > > > virbr0          /sys/class/net/virbr0/bridge: No such file or directory
> > > > /sys/class/net/virbr0/bridge: No such file or directory
> > > > /sys/class/net/virbr0/bridge: No such file or directory
> > > > /sys/class/net/virbr0/bridge: No such file or directory
> > > > /sys/class/net/virbr0/bridge: No such file or directory
> > > > /sys/class/net/virbr0/bridge: No such file or directory
> > > > /sys/class/net/virbr0/bridge: No such file or directory
> > > > /sys/class/net/virbr0/bridge: No such file or directory
> > > > /sys/class/net/virbr0/bridge: No such file or directory
> > > > /sys/class/net/virbr0/bridge: No such file or directory
> > > > /sys/class/net/virbr0/bridge: No such file or directory
> > > > /sys/class/net/virbr0/bridge: No such file or directory
> > > > 8000.000000000000       yes
> > > >  
> > > > FYI, /sys/class/net/virbr0/bridge does exist. That said I can't install 
> > > > any DomU because virbr0 is down/not working.
> > > >  
> > > > I read all threads about this problem, but none gave any solutions. 
> > > > Please help. Thank you
> > > >                                           
> > > 
> > > 
> > > Those errors are related to the bridge-utils rpm version..
> > > There is a workaround documented somewhere.. probably on centos 
> > > mailinglist.
> > > 
> > 
> > or actually it's because the stock rhel6 kernel includes some patch to 
> > kernel bridging code so rhel6 bridge-utils rpm had to be patched for the 
> > kernel change.
> > 
> > so when you use xen.git 2.6.32 kernel (which is not based on rhel6 kernel) 
> > you don't have
> > the kernel change for bridging and the patched bridge-utils rpm doesn't 
> > work anymore.
> > 
> > Try using mayoung's el6 xendom0 kernel rpm.. it *is* based on rhel6 kernel 
> > so it includes the bridging patch.
> > 
> 
> The bridging problem and the fix is discussed here:
> http://lists.xensource.com/archives/html/xen-devel/2011-02/msg00760.html
> 
> Problem is Redhat added IGMP snooping support to rhel6-kernel,
> so they had to patch bridge-utils aswell, but the vanilla Linux 2.6.32
> does not have igmp-snooping so when you use mainline 2.6.32 or 
> xen/stable-2.6.32.x
> with the rhel6 bridge-utils you get those errors.
> 

I also added that info to http://wiki.xen.org/xenwiki/RHEL6Xen4Tutorial now.

-- Pasi


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