openstack team mailing list archive

[Dan Wendlandt <dan@xxxxxxxxxx>]

On Sun, Nov 4, 2012 at 9:57 PM, Vinay Bannai <vbannai@xxxxxxxxx> wrote:

> I have a multi node setup. The CC controller doubles up as the quantum
> server and also has the l3 agent and DHCP. I have configured OVS as my
> L2 plugin with vlan tunneling. On the compute nodes, I see that in
> addition to having the integration bridge (br-int) you will also need
> the ovs physical bridge (br-th1) with the physical ether port eth1 as
> a member. I am wondering about the relationship between br-int and
> br-eth1 bridges. Wouldn't it make sense to add eth1 port to the
> integration mode.


you might have quantum networks that use vlans on different on different
physical NICs (e.g., eth0 and eth1), so adding each NIC directly to br-int
wouldn't make sense.  Similarly, you might have some quantum networks that
also use tunneling.  Hence, all vNICs are just plugged into br-int, and the
plugin is responsible for doing the right thing with the traffic.

Dan




> Why have two bridges on the compute node for VMs to
> talk to other VMs in the same tenancy over the physical network?
> I am sure I am missing something in my understanding so would
> appreciate any comments or explanations.
>
> Thanks
> Vinay
>
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-- 
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Dan Wendlandt
Nicira, Inc: www.nicira.com
twitter: danwendlandt
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