[Bridge] Freezing bridges

Jeroen Hoek jeroen.hoek at dcf.nl
Tue Jan 20 05:11:11 PST 2004

On Fri, 2004-01-16 at 20:07, Stephen Hemminger wrote:
> On Thu, 15 Jan 2004 09:29:11 +0100
> Jeroen Hoek <jeroen.hoek at dcf.nl> wrote:
> > On Wed, 2004-01-14 at 21:43, Stephen Hemminger wrote:
> > > Sounds like the bridge freezes, but the server doesn't really crash.
> > > Is there any console output or message log when this occurs?
> > > 
> > > Are you running spanning tree protocol?
> > > Are the machines SMP or UP?
> > > What is the output of brctl show and ifconfig when the network freezes?
> > 
> > Well, the servers become unapproachable. Ssh fails (although ping and
> > daytime/xinetd work) and attaching a monitor and keyboard to the
> > physical machine shows only a blank screen instead of a loginprompt. The
> > logs show nothing at all afterwards. There seems to be some life left in
> > the server during these freezes, but no ssh or tunnels.
> > 
> > I have STP turned on on the bridges, although there is no chance of a
> > networkloop. Should this be turned off?
> Unless, you need to discover other bridges turn it off.
> Just looking for what could disturb your system after it is running.
> In 2.6 (and later 2.4) kernels STP defaults to off, to avoid potential
> problems with those that don't need it.
> You could try 2.6 (2.6.1) on one machine, it would at least provide information
> about whether this problem has already been fixed.

So far the central machine and the three satellite machines have been
running stable since thursday after disabling STP. I'm hoping that
solved it. :)

I'm keeping the 2.6 option in case the problems aren't gone yet, I have
the systems ready to switch to kernel 2.6 in a moments notice.

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