From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nils Cant <nils.cant@kangaroot.net>
Subject: Re: KVM doesn't send an arp announce after live migrating a domain
Date: Wed, 25 Aug 2010 11:21:21 +0200
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References: <4C74CBB0.7080203@kangaroot.net> <20100825083812.GG10499@redhat.com>
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To: Gleb Natapov <gleb@redhat.com>
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On 08/25/2010 10:38 AM, Gleb Natapov wrote:
> qemu sends gratuitous ARP after migration. Check forward delay setting on your
> bridge interface. It should be set to zero.
>

Aha! That fixed it. Turns out that debian bridge-utils sets the default 
to 15 for bridges.
Manually setting it to 0 with 'brctl setfd br0 0' or setting the 
'bridge_fd' parameter to 0 in /etc/network/interfaces solves the issue.

Thanks for the help!

Nils