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RE: [Xen-devel] Xen 3.3.1 live migration : unsolicited ARP

from [Olivier Blanc]

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To:	James Harper <james.harper@xxxxxxxxxxxxxxxx>
Subject:	RE: [Xen-devel] Xen 3.3.1 live migration : unsolicited ARP
From:	Olivier Blanc <olivier.blanc@xxxxxxxxxxxxxxxxxxxxxx>
Date:	Fri, 29 May 2009 13:44:11 +0200
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> > 
> >  I would like to understand the condition that makes the live
> migration
> >  process to generate the unsolicited ARP REPLY, as I could never get
> it
> >  to be generated !
> > 
> > Do you have any pointer to help me understand the process ?
> > 
> 
> Do you have STP enabled on your bridge? If enabled, it could delay the
> bridge port coming up for long enough that the ARP packet gets lost.
> 
> James 

No STP is off in my bridge and forwardDelay is set to 0.

And the bridge port is ready very quickly, if I set the following
parameters value in the "ntable" of the bridge to 
reachable -> 12
delay_probe -> 20
ucast_probes -> 0

Then I lose only 2 ping transactions (less than 2 secs) to the migrated
DOMU. 

Olivier


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