RE: [Xen-devel] Why is STP turned off?

["Caitlin Bestler" <Caitlin.Bestler@xxxxxxxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Keir Fraser
> Sent: Thursday, May 01, 2008 8:33 AM
> To: John Haxby; xen-devel
> Subject: Re: [Xen-devel] Why is STP turned off?
> 
> On 30/4/08 14:50, "John Haxby" <john.haxby@xxxxxxxxxx> wrote:
> 
> > So, I guess someone knew what they were doing
> >
> > Why did you turn STP off?
> 
> All bridge interfaces but the external interface are guest vif's which
> are
> typically not hiding bridges. This simple topology does not require
> STP.
> 
>  -- Keir

The guest vifs are indeed very unlikely to be acting as bridges.
And any switch that only has a single uplink and N internal links
(none of which lead to a Bridge) can indeed decide not be an 802.1
Bridge and therefore not run spanning tree.

But if Xen is not running spanning tree and one of the Guest VIFs
*does* run spanning tree the results can be quite messy. An explicit
warning on this might make sense.


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