[Openstack-mentoring] Neutron subnet with DHCP relay - continued

Thomas King thomas.king at gmail.com
Mon Aug 3 21:58:53 UTC 2020

I've been using named physical networks so long, I completely forgot using

Is this the answer????

Tom King

On Tue, Jul 28, 2020 at 3:46 PM Thomas King <thomas.king at gmail.com> wrote:

> Ruslanas has been a tremendous help. To catch up the discussion lists...
> 1. I enabled Neutron segments.
> 2. I renamed the existing segments for each network so they'll make sense.
> 3. I attempted to create a segment for a remote subnet (it is using DHCP
> relay) and this was the error that is blocking me. This is where the docs
> do not cover:
> [root at sea-maas-controller ~(keystone_admin)]# openstack network segment
> create --physical-network remote146-30-32 --network-type flat --network
> baremetal seg-remote-146-30-32
> BadRequestException: 400: Client Error for url:
>, Invalid input for operation:
> physical_network 'remote146-30-32' unknown for flat provider network.
> I've asked Ruslanas to clarify how their physical networks correspond to
> their remote networks. They have a single provider network and multiple
> segments tied to multiple physical networks.
> However, if anyone can shine some light on this, I would greatly
> appreciate it. How should neutron's configurations accommodate remote
> networks<->Neutron segments when I have only one physical network
> attachment for provisioning?
> Thanks!
> Tom King
> On Wed, Jul 15, 2020 at 3:33 PM Thomas King <thomas.king at gmail.com> wrote:
>> That helps a lot, thank you!
>> "I use only one network..."
>> This bit seems to go completely against the Neutron segments
>> documentation. When you have access, please let me know if Triple-O is
>> using segments or some other method.
>> I greatly appreciate this, this is a tremendous help.
>> Tom King
>> On Wed, Jul 15, 2020 at 1:07 PM Ruslanas Gžibovskis <ruslanas at lpic.lt>
>> wrote:
>>> Hi Thomas,
>>> I have a bit complicated setup from tripleo side :) I use only one
>>> network (only ControlPlane). thanks to Harold, he helped to make it work
>>> for me.
>>> Yes, as written in the tripleo docs for leaf networks, it use the same
>>> neutron network, different subnets. so neutron network is ctlplane (I
>>> think) and have ctlplane-subnet, remote-provision and remote-KI :)) that
>>> generates additional lines in "ip r s" output for routing "foreign" subnets
>>> through correct gw, if you would have isolated networks, by vlans and ports
>>> this would apply for each subnet different gw... I believe you
>>> know/understand that part.
>>> remote* subnets have dhcp-relay setup by network team... do not ask
>>> details for that. I do not know how to, but can ask :)
>>> in undercloud/tripleo i have 2 dhcp servers, one is for introspection,
>>> another for provide/cleanup and deployment process.
>>> all of those subnets have organization level tagged networks and are
>>> tagged on network devices, but they are untagged on provisioning
>>> interfaces/ports, as in general pxe should be untagged, but some nic's can
>>> do vlan untag on nic/bios level. but who cares!?
>>> I just did a brief check on your first post, I think I have simmilar
>>> setup to yours :)) I will check in around 12hours :)) more deaply, as will
>>> be at work :)))
>>> P.S. sorry for wrong terms, I am bad at naming.
>>> On Wed, 15 Jul 2020, 21:13 Thomas King, <thomas.king at gmail.com> wrote:
>>>> Ruslanas, that would be excellent!
>>>> I will reply to you directly for details later unless the maillist
>>>> would like the full thread.
>>>> Some preliminary questions:
>>>>    - Do you have a separate physical interface for the segment(s) used
>>>>    for your remote subnets?
>>>>    The docs state each segment must have a unique physical network
>>>>    name, which suggests a separate physical interface for each segment unless
>>>>    I'm misunderstanding something.
>>>>    - Are your provisioning segments all on the same Neutron network?
>>>>    - Are you using tagged switchports or access switchports to your
>>>>    Ironic server(s)?
>>>> Thanks,
>>>> Tom King
>>>> On Wed, Jul 15, 2020 at 12:26 AM Ruslanas Gžibovskis <ruslanas at lpic.lt>
>>>> wrote:
>>>>> I have deployed that with tripleO, but now we are recabling and
>>>>> redeploying it. So once I have it running I can share my configs, just name
>>>>> which you want :)
>>>>> On Tue, 14 Jul 2020 at 18:40, Thomas King <thomas.king at gmail.com>
>>>>> wrote:
>>>>>> I have. That's the Triple-O docs and they don't go through the normal
>>>>>> .conf files to explain how it works outside of Triple-O. It has some ideas
>>>>>> but no running configurations.
>>>>>> Tom King
>>>>>> On Tue, Jul 14, 2020 at 3:01 AM Ruslanas Gžibovskis <ruslanas at lpic.lt>
>>>>>> wrote:
>>>>>>> hi, have you checked:
>>>>>>> https://docs.openstack.org/project-deploy-guide/tripleo-docs/latest/features/routed_spine_leaf_network.html
>>>>>>>  ?
>>>>>>> I am following this link. I only have one network, having different
>>>>>>> issues tho ;)
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