[openstack-dev] About DVR limit

Stamina than Valued an souminathan at yahoo.com
Wed Jan 14 03:04:30 UTC 2015

Hi yong Zheng,
Yes your understanding is right.
We only support ovs driver.
Regarding HA and multi network support, it will be available in kilo.

Public address consumption for north south traffic for compute node is also true. But to address this issue we do have a proposal that is worked out by the l3 sub team.

I hope this clarifies your doubts.

Please let me know if I can help you with anything else.


Sent from my iPad

> On Jan 13, 2015, at 6:01 PM, 龚永生 <gong.yongsheng at 99cloud.net> wrote:
> Hi,
>  I am yong sheng gong, I want to know if the DVR has these limits besides the documented at http://docs.openstack.org/networking-guide/content/ha-dvr.html:
> 1. one subnet can be connected to DVR router only once, which is confirmed by BP https://blueprints.launchpad.net/neutron/+spec/neutron-ovs-dvr-multigateway
> 2. one network cannot have more than one subnet connecting to DVR routers
> So the DVR limits the neutron model to:
> one network has just one subnet, and one subnet cannot connect to more than one DVR routers.
> ps.
> req and limits documented at http://docs.openstack.org/networking-guide/content/ha-dvr.html::
>  DVR requirements
> You must use the ML2 plug-in for Open VSwitch (OVS) to enable DVR.
> Be sure that your firewall or security groups allows UDP traffic over the VLAN, GRE, or VXLAN port to pass between the compute hosts.
>  DVR limitations
> Distributed virtual router configurations work with the Open vSwitch Modular Layer 2 driver only for Juno.
> In order to enable true north-south bandwidth between hypervisors (compute nodes), you must use public IP addresses for every compute node and enable floating IPs.
> For now, based on the current neutron design and architecture, DHCP cannot become distributed across compute nodes.
> thanks,
> Yong sheng gong
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