Hi Yamahata-san,

Thanks for your quick answer last time! I got the VM image working with GRE 
tunnels between the OVSs. 

However, in order to fully benefit from Ryu Controller's ability to do L2 
separation using OpenFlow, I'd like to set it up without the GRE tunnels 
between the OVSs. Below is my topology. I want to confirm with you if this is 
possible.
 
                   mgmt
   +----------------+-----------------+
   |                |                 |
   V eth0           V                 V eth0
+----+     +------------------+     +----+
|Ryu1|<===>|Pica8 Open vSwitch|<===>|Ryu2|
+----+     +------------------+     +----+
   eth2                           eth2


So far, I have confirmed all three OVSs on Ryu1, Ryu2, and Pica8 switch are 
registered with Ryu Manager. By setting RYU_EXT_INTERFACE to eth2, stack.sh has 
added eth2 to br-int. However, I don't see any traffic over br-int or eth2. 
There are still GRE tunnels between the Ryu1 and Ryu2 over the eth0 interfaces.

I am using the VM image from 
https://github.com/osrg/ryu/wiki/RYU-OpenStack-Folsom-environment-VM-image-file-HOWTO

Is it possible to customize this image to do what I'm trying to do?

Thanks in advance!

Yue
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