i have the same problem with you, and i solved it like this.
kvm3 is a compute node.
[root@kvm3 ~]# crontab -l
0 23 * * * ntpdate 172.21.4.20 >> /var/log/ntpdate.log
30 4 * * 7 sh /work/openstack/restartport.sh >> /work/openstack/restart.log 2>&1
[root@kvm3 ~]# cat /work/openstack/restartport.sh
#!/bin/sh
su -p -s /bin/sh root
. /root/.bash_profile
export PATH=$PATH:/sbin:.
ovs-vsctl del-port tap1d092a07-44
ovs-vsctl add-port br-int tap1d092a07-44 tag=3
ifconfig tap1d092a07-44 up
ovs-vsctl del-port tap816c181e-e1
ovs-vsctl add-port br-int tap816c181e-e1 tag=2
ifconfig tap816c181e-e1 up
172.21.0.32 is a vm
[root@172-21-0-32 ~]# crontab -l
10 * * * * /usr/sbin/ntpdate 172.21.0.116 >> /var/log/ntpdate.log
50 4 * * 7 sh /work/openstack/restartport.sh >> /work/openstack/restart.log 2>&1
[root@172-21-0-32 ~]# cat /work/openstack/restartport.sh
#!/bin/sh
. ~/.bash_profile
cd /etc/init.d
./network restart
ping -c 5 172.21.0.1
yuanpu
From: happy idea
Date: 2013-09-02 13:34
To: openstack
Subject: [Openstack] [OPENSTACK][Grizzly] Have you Migrate/Live Migration
Completely successful ?
After Migrate or Live Migration , the VM lost network connection.
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