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Internal vlan is not necessarily obstacle to vlan trunk, no qinq support in ovs is the key factor.

If ovs suppport qinq, vlan trunk could be treated as a generalized "flat" type network, which let packets from tenant VM go to the wire unmodified, if packets carry no tag, then it's the same as current flat type.


________________________________________
From: YAMAMOTO Takashi [yamamoto at valinux.co.jp]
Sent: Wednesday, September 24, 2014 11:08 AM
To: openstack-dev at lists.openstack.org
Subject: Re: [openstack-dev] [Neutron] Enabling vlan trunking on        neutron port.

more specifically, the way OVS-agent uses OVS ("internal vlan") is
incompatible with tenant tagged VLANs.
ofagent for Juno, which also uses OVS as its dataplane, doesn't have
the problem.
i'm not sure how tenant VLANs are supposed to be used with neutron,
though.  (eg. what ip addresses should be used for non-trunk VLANs)

YAMAMOTO Takashi

> Aaron: untrue.  It does, but OVS doesn't, and so networks implemented with
> the OVS driver will drop packets.  Use Linuxbridge instead.
> --
> Ian.
>
> On 19 September 2014 22:27, Aaron Rosen <aaronorosen at gmail.com> wrote:
>
>> Neutron doesn't allow you to send tagged traffic from the guest today
>> https://github.com/openstack/neutron/blob/master/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py#L384
>>
>>
>> On Fri, Sep 19, 2014 at 7:01 AM, Parikshit Manur <
>> parikshit.manur at citrix.com> wrote:
>>
>>>  Hi All,
>>>
>>>                 I have a setup which has VM on flat provider network ,
>>> and I want to reach VM on VLAN provider network. The packets are forwarded
>>> till veth pair and are getting dropped by br-int.
>>>
>>>
>>>
>>> Can neutron port be configured to allow vlan  trunking?
>>>
>>>
>>>
>>> Thanks,
>>>
>>> Parikshit Manur
>>>
>>> _______________________________________________
>>> OpenStack-dev mailing list
>>> OpenStack-dev at lists.openstack.org
>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>>>
>>>
>>
>> _______________________________________________
>> OpenStack-dev mailing list
>> OpenStack-dev at lists.openstack.org
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