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On 13 July 2016 at 15:32, Cathy Zhang <Cathy.H.Zhang at huawei.com> wrote:

> Hi Everyone,
>
> We have been discussing on multi-tenant VNF for service chain on the OVN
> mailing alias.
> We are thinking about leveraging the vlan-aware-VM for supporting this.
>
> AFAIK, with current nova, we cannot create a multi-tenant  VNF.
> Currently, nova checks whether the neutron port belongs to the same tenant
> as the VM itself.
> You attach a network interface (neutron port) to a VM using nova
> interface-attach, if the port and the VM are in different tenants, an error
> is given.
>
> With the introduction of the trunk-port/sub-port feature of Neutron, the
> sub-ports of a VM are allowed to associate with different networks. But it
> seems these networks need to all belong to the same tenant if we read the
> vlan-aware-vm spec correctly (
> http://specs.openstack.org/openstack/neutron-specs/specs/newton/vlan-aware-vms.html
> ).
>
> Is our understanding correct? Does it work properly if these networks
> belong to different tenants?
>

At the moment this area is still WIP, but we're focusing on the single
tenant use case. RBAC may help us down the road to address what you need,
but it's premature to speculate on how the implementation looks like.

Cheers,
Armando


>
> Thanks,
> Cathy
>
> -----Original Message-----
> From: dev [mailto:dev-bounces at openvswitch.org] On Behalf Of Farhad
> Sunavala
> Sent: Tuesday, July 12, 2016 7:59 PM
> To: dev at openvswitch.org
> Subject: Re: [ovs-dev] SFC-Summary: MultiTenant
>
> >I was thinking this could be handled with child / sub-ports.  We do
> >this today for containers in VMs.  We can have a single VIF for a VM
> >that is connected to multiple networks that are owned by separate
> >tenants.  Some sort of encapsulation (VLAN ID, MPLS header, whatever)
> >would be used to differentiate the traffic for each networking in/out
> >of that VIF.  I had started adding the ability to use MPLS for this in
> >my prototype for this reason, as that was what networking-sfc had defined.
> I have a quick question on the above. (multi-tenancy).Yes, I know the
> containers can be in different networks of the same tenant.How does it work
> when the containers are in different tenants ?
> Below is the latest spec for vlan-aware-vms
> https://specs.openstack.org/openstack/neutron-specs/specs/liberty/vlan-aware-vms.html
>
> The trick is to create neutron ports (for the subports) and then link them
> to the trunk port using neutron trunk-subport-add TRUNK \
>  PORT[,SEGMENTATION-TYPE,SEGMENTATION-ID] \   [PORT,...]
>
> In the above command all the neutron ports (trunk  ports and subports)
> must be in the same tenant.As far as I know, a tenant will not see neutron
> ports from another tenant.    Or will this command allow neutron ports from
> different tenants to be attached ?
> E.g.  VM "X" consists of containers C1 in Tenant 1 with portID = C10000
> (network dn1)container C2 in Tenant 2 with portID = C20000 (network dn2)The
> trunk port of VM "X" is in tenant 100 with portID = T10000 (network dt) The
> above command will be neutron trunk-subport-add T10000 \   A  vlan 10000 \
>  B vlan 20000 Is my understanding correct? thanks,Farhad.
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