[ovs-dev] How to set VXLAN VNI?

[Kyle Mestery (kmestery)]

On Feb 25, 2013, at 8:40 PM, Changbin Liu <changbin.liu at gmail.com>
 wrote:
> Hi folks,
> 
> I have been using OpenvSwtich for a while and the VXLAN feature is awesome. We are able to run OpenStack on top of it now. During deployment, I have one question: how to set the VNI (VXLAN Network ID) of VXLAN tunnels? I have checked the content of packets, and seems like the VNI field is all set to zero. I believe VXLAN's VNI (up to 16M in total) is a great selling point compared to VLAN. I have Googled around but had no luck finding any useful document. I would really appreciate your help. Thanks!
> 
> Changbin
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Hi Changbin:

There are 2 ways to do it:

Per port, you can use it when creating the VXLAN port like this:

ovs-vsctl add-port br5 vxlan5 -- set interface vxlan5 type=vxlan options:remote_ip=192.168.5.14 options:key=<VNI> options:dst_port=9999

This limits you to that particular port having only that VNI when packets hit it. A more dynamic way to do it is to set the key to "flow" and program VNIs using flow programming like this:

ovs-vsctl add-port br5 vxlan5 -- set interface vxlan5 type=vxlan options:remote_ip=192.168.5.14 options:key=flow options:dst_port=9999

Then you create flows with actions of "set_tunnel" to set the VNI. This is how OpenStack Quantum with the OVS plugin does things, for example.

BTW: Which version of OVS VXLAN code are you running? The current code in master is slightly broken waiting for a few commits to go in to fix things.

Thanks,
Kyle