I had same a same issue a few days ago. In my case, two vm had same mac address and it caused problem. below link is that issue thread. At least, it will helps you find what cause the problem http://www.mail-archive.com/discuss@openvswitch.org/msg06632.html
2013/7/25 Aman Sharma <amansh.shar...@gmail.com> > Hi All > > I am trying to build a gre tunnel between the two openvswitches.I am using > ubuntu 12.04.But i am not able to ping between the two vitual machines. > My set up is explained below. > > [image: Inline image 1] > > > > I have two openvswitches (ovs1 and ovs2).ovs1 has ip address > 192.168.5.94(eth0) and ovs2 is 192.168.5.172(eth0).Both the switches are > directly connected by the eth0 interface. I have two bridges br0 and br1 in > both the switches.I have given ip of eth0 of ovs1 to br0 and br1 is > 10.1.1.1 . Similarly in ovs2 br0 has an ip of eth0 and br1 is 10.1.1.2 . > Then i am adding eth0 to the br0 in both the switches.Now i can > successfully ping between the both the br0's. Then i added virtual machines > in br1 in both the switches using KVM utility.so vm1(IP:10.1.1.20 AND > GATEWAY:10.1.1.1)is in br1 in ovs1 and vm2 (IP:10.1.1.30 AND > GATEWAY:10.1.1.2 is in br1 in ovs2. Then i am making a gre tunnel between > the two openvswitches .So that i can ping between the two virtual machines. > > Command i am using for gre tunnel IS > > OVS1: ovs-vsctl add-port br1 gre0 -- set interface gre0 type=gre > options:remote_ip=192.168.5.172(ip of br0 of ovs2) > OVS2: ovs-vsctl add-port br1 gre0 -- set interface gre0 type=gre > options:remote_ip=192.168.5.94(ip of br0 of ovs1) > > Now i can ping br0 and br1 of ovs1 from vm1 but i am unable to reach br0 > and br1 of ovs2 through vm1. Also i can not ping between the two virtual > machines. > Might be my gre tunnel is not working or it can be a kernel version > problem.Is gre tunnel depends on kernel version?? > > Please help me in this. > > Thanks for your help in advance. > > Regards > > Aman Sharma > > _______________________________________________ > discuss mailing list > discuss@openvswitch.org > http://openvswitch.org/mailman/listinfo/discuss > >
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