[Openstack] How to configure Neutron Networking from GRE to VXLAN?

Benedikt Trefzer benedikt.trefzer at cirrax.com
Wed May 28 05:41:13 UTC 2014

Hi Kim

I just did the same switching from gre to vxlan.
Here's what I learned:

You have to delete all the old networks in the installation that where
created with gre. They do not work because the tunnel type is stored in
the DB. I was not able to change it.

According to ovs-neutron_plugin.ini. I think this depends on the
distribution used. I realized, that not all daemons read the same config
files on startup. Thats why I had also to modify both mentioned files.
To ensure all parameteters are set, I used debug=True and verbose=True
like this you see the configuration the daemon uses in the logfile.

hope this helps


On 28.05.2014 04:32, BYEONG-GI KIM wrote:
> Hello.
> I followed the installation guide for OpenStack Icehouse, and the
> installation was completed successfully; Two Instances could ping with
> each other through GRE unnel.
> After that, I've tried to modify the Networking from GRE to VXLAN by
> following the Configuration Reference
> described http://docs.openstack.org/trunk/config-reference/content/networking-plugin-ml2_vxlan.html
> Although I modified all the parameters like "type_drivers",
> "tenant_network_types", "vni_ranges", etc. and restart all the related
> services on the every nodes, the VXLAN network doesn't work fine at all.
> First, I could not add an additional network on dashboard. Second, the
> br-tun on both Compute Node and Network Node did not have a port for VXLAN. 
> I read the configuration guide
> at http://kimizhang.wordpress.com/2014/04/01/how-ml2vxlan-works/, and
> the guide describes
> /etc/neutron/plugins/openvswitch/ovs-neutron_plugin.ini also needs to be
> modified. But I didn't because the Installation Guide for OpenStack
> Icehouse didn't mention such things even though the guides shows how to
> set up the GRE as default. 
> Should I modify
>  /etc/neutron/plugins/openvswitch/ovs-neutron_plugin.ini? Or what I need
> to do?
> Best regards
> Byeong-Gi KIM
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