[Openstack] [neutron] GRE network with 5 nodes

gustavo panizzo <gfa> gfa at zumbi.com.ar
Wed May 14 09:19:52 UTC 2014

On 05/14/2014 06:00 AM, Ageeleshwar Kandavelu wrote:
> I wasn't using ml2. I did a havana with neutron-openvswitch-agent. the old way. Its not only the latency. When I created external network and assigned floatingip and tried to reach it only one or two packets where reaching. it was 99% packet loss.
that's not right, gre works fine, is just slower than vlan.

have you tried lowering your VMs mtu?

> ________________________________________
> From: gustavo panizzo <gfa> [gfa at zumbi.com.ar]
> Sent: Wednesday, May 14, 2014 2:24 PM
> To: Ageeleshwar Kandavelu; <openstack at lists.openstack.org>
> Subject: Re: [Openstack] [neutron] GRE network with 5 nodes
> On 05/14/2014 03:56 AM, Ageeleshwar Kandavelu wrote:
>> What I inferred was while using the GRE mode the switch's port were
>> constantly blinking indicating heavy traffic. I am aware that in GRE
>> mode there is a mesh of tunnels between the various nodes. I assumed
>> that the GRE mode was placing a burden too heavy on the switch and tore
>> down the setup and created a vlan setup instead. The performance was
>> good with vlan.
>> Is this expected or I had been doing something wrong?
> i've observed the same behavior, gre adds more latency than vlan
> were you creating new VMs? ml2 pop layer plugin should help in that case
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