Then maybe an outstanding comment like what you described below can be added to 
warning user right way to enable/disable vif?
Thanks,
Kevin
>-----Original Message-----
>From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
>[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Ewan Mellor
>Sent: 2005年11月9日 19:45
>To: Tian, Kevin
>Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
>Subject: Re: [Xen-devel] Is it possible to disable vif completely?
>
>On Wed, Nov 09, 2005 at 07:30:28PM +0800, Tian, Kevin wrote:
>
>> I think comment " #vif = [ 'mac=aa:00:00:00:00:11, bridge=xen-br0' ]" can
>> hide vif but failed try.
>
>If you comment out the vif line, but don't set nics=0 then you will get the
>default nics value, which is 1. This means that it will try to create a nic
>with default configuration, which will fail. If you need no nics, you need to
>explicitly say so, with nics=0.
>
>This is confusing, and a mess, but I don't want to alter configuration file
>behaviour this close to release, if I can help it.
>
>Ewan.
>
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