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<DIV>i have the same problem with you, and i solved it like this. </DIV>
<DIV> </DIV>
<DIV>kvm3 is a compute node.</DIV>
<DIV>
<DIV> </DIV>
<DIV>[root@kvm3 ~]# crontab -l</DIV>
<DIV>0 23 * * * ntpdate 172.21.4.20 >> /var/log/ntpdate.log</DIV>
<DIV>30 4 * * 7 sh /work/openstack/restartport.sh >> /work/openstack/restart.log 2>&1</DIV>
<DIV>[root@kvm3 ~]# cat /work/openstack/restartport.sh</DIV>
<DIV>#!/bin/sh</DIV>
<DIV>su -p -s /bin/sh root</DIV>
<DIV>. /root/.bash_profile</DIV>
<DIV>export PATH=$PATH:/sbin:.</DIV>
<DIV>ovs-vsctl del-port tap1d092a07-44</DIV>
<DIV>ovs-vsctl add-port br-int tap1d092a07-44 tag=3</DIV>
<DIV>ifconfig tap1d092a07-44 up</DIV>
<DIV>ovs-vsctl del-port tap816c181e-e1</DIV>
<DIV>ovs-vsctl add-port br-int tap816c181e-e1 tag=2</DIV>
<DIV>ifconfig tap816c181e-e1 up</DIV>
<DIV> </DIV>
<DIV>172.21.0.32 is a vm</DIV>
<DIV> </DIV>
<DIV>
<DIV>[root@172-21-0-32 ~]# crontab -l</DIV>
<DIV>10 * * * * /usr/sbin/ntpdate 172.21.0.116 >> /var/log/ntpdate.log</DIV>
<DIV>50 4 * * 7 sh /work/openstack/restartport.sh >> /work/openstack/restart.log 2>&1</DIV>
<DIV>[root@172-21-0-32 ~]# cat /work/openstack/restartport.sh</DIV>
<DIV>#!/bin/sh</DIV>
<DIV>. ~/.bash_profile</DIV>
<DIV>cd /etc/init.d</DIV>
<DIV>./network restart</DIV>
<DIV>ping -c 5 172.21.0.1</DIV></DIV></DIV>
<DIV> </DIV>
<HR style="HEIGHT: 1px; WIDTH: 210px" align=left color=#b5c4df SIZE=1>
<DIV><SPAN>yuanpu</SPAN></DIV>
<DIV> </DIV>
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<DIV><B>From:</B> <A href="mailto:guolongcang.work@gmail.com">happy
idea</A></DIV>
<DIV><B>Date:</B> 2013-09-02 13:34</DIV>
<DIV><B>To:</B> <A
href="mailto:openstack@lists.openstack.org">openstack</A></DIV>
<DIV><B>Subject:</B> [Openstack] [OPENSTACK][Grizzly] Have you Migrate/Live
Migration Completely successful ?</DIV></DIV></DIV>
<DIV>
<DIV class=FoxDiv20130902141737983163>
<DIV dir=ltr>After Migrate or Live Migration , the VM lost network
connection.</DIV></DIV></DIV></BODY></HTML>