Hi everyone,
I was first trying to test the MPLS function of OVS with the SDN-hub VM
http://sdnhub.org/tutorials/sdn-tutorial-vm/
This VM includes Mininet 2.1 and OVS 2.1, but it doesn't work well with
MPLS: I install flow entry on s1 to push a MPLS label on packets from h1 to h2.
The packet is seen on the ingress port, but not the outgress port. When I
change the output port to controller, I can see the Labeled-Packetins and
Labeled-Packetouts, but then the Packetouts are lost again. So basically the
switch is dropping anything with a MPLS label when it is trying to send them
out. ( The Packetins and outs are correctly labeled, so I guess the flow entry
has nothing to do with it)
I thought, ok, maybe this version of OVS does not support MPLS well, so I
asked Justin for this and he confirmed my thought. And he showed me this
https://github.com/openvswitch/ovs/tree/branch-2.3 (thx, Justin)
This is when the problems occured: I git cloned this version of OVS and
tried to install it on several VMs, like a completely clean Ubuntu-Server, the
Mininet VM(https://github.com/mininet/mininet/wiki/Mininet-VM-Images), and the
SDN-hub VM, I need Mininet too. But after installation of this OVS-2.3.90, I
can't ping between hosts. The "ovs-vsctl show" command shows that the current
version of OVS is 2.3.90, and no error reports for ovsdb or any other. The
Mininet is running just fine, no errors reported, except that hosts CANNOT
PING. I try with both local ovs-controller and remote controller ( in this
case, Floodlight-Plus which supports OF1.3), neither work. It only works when I
install the flow entries myself with the "ovs-ofctl add-flow" command, so I
guess the problem lies in the connection between controller and OVS, but I
couldn't tell what is wrong coz the "ovs-vsctl list controller" command shows
that the controller is correctly connected. The console of FL+ shows that the
switch is connected too, but it just CANNOT PING.
Does anyone know what's going on here? I followed the instruciton here
http://techandtrains.com/2013/10/24/another-way-to-upgrade-open-vswitch-in-mininet/
to upgrade the OVS in Mininet with my version of 2.3.90. I also tried to
install Mininet first, and then run "./install.sh -r" to remove OVS, and then
install OVS-2.3.90 under the instruction here
https://github.com/openvswitch/ovs/blob/branch-2.3/INSTALL. Neither way
reported any error, so I can't tell where is wrong, except that ovs-controller
is not included in OVS-2.3.90, so I couldn't run Mininet by default, I had to
connect to a remote controller, this is fine though, but sadly a remote
controller didn't work either.
I had no idea which part went wrong during this process, I don't have much
knowledge on how Mininet and OVS are installed and how they work, so I can't
tell whether the instructions above have introduced any problems. My main goal
is to use Mininet and OVS to test MPLS funtion, so if anyone knows how I can
achieve this goal, plz tell me. And if anyone knows what I have done wrong in
the aforementioned process, plz tell me too.
Thx a lot.
----
Best regards,
Yikai
Research Intern
Institute for Network Sciences and Cyberspace,
Tsinghua University
Senior Student
Schoold of Information and Communication Engineering,
Beijing University of Posts and Telecommunications
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