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

Ruslanas Gžibovskis ruslanas at lpic.lt
Wed Jul 15 06:26:13 UTC 2020


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 ;)
>>
>>
>>
>> On Tue, 14 Jul 2020 at 03:31, Thomas King <thomas.king at gmail.com> wrote:
>>
>>> Thank you, Amy!
>>>
>>> Tom
>>>
>>> On Mon, Jul 13, 2020 at 5:19 PM Amy Marrich <amy at demarco.com> wrote:
>>>
>>>> Hey Tom,
>>>>
>>>> Adding the OpenStack discuss list as I think you got several replies
>>>> from there as well.
>>>>
>>>> Thanks,
>>>>
>>>> Amy (spotz)
>>>>
>>>> On Mon, Jul 13, 2020 at 5:37 PM Thomas King <thomas.king at gmail.com>
>>>> wrote:
>>>>
>>>>> Good day,
>>>>>
>>>>> I'm bringing up a thread from June about DHCP relay with neutron
>>>>> networks in Ironic, specifically using unicast relay. The Triple-O docs do
>>>>> not have the plain config/neutron config to show how a regular Ironic setup
>>>>> would use DHCP relay.
>>>>>
>>>>> The Neutron segments docs state that I must have a unique physical
>>>>> network name. If my Ironic controller has a single provisioning network
>>>>> with a single physical network name, doesn't this prevent my use of
>>>>> multiple segments?
>>>>>
>>>>> Further, the segments docs state this: "The operator must ensure that
>>>>> every compute host that is supposed to participate in a router provider
>>>>> network has direct connectivity to one of its segments." (section 3 at
>>>>> https://docs.openstack.org/neutron/pike/admin/config-routed-networks.html#prerequisites -
>>>>> current docs state the same thing)
>>>>> This defeats the purpose of using DHCP relay, though, where the Ironic
>>>>> controller does *not* have direct connectivity to the remote segment.
>>>>>
>>>>> Here is a rough drawing - what is wrong with my thinking here?
>>>>> Remote server: 10.146.30.32/27 VLAN 2116<-----> Router with DHCP
>>>>> relay <------> Ironic controller, provisioning network:
>>>>> 10.146.29.192/26 VLAN 2115
>>>>>
>>>>> Thank you,
>>>>> Tom King
>>>>> _______________________________________________
>>>>> openstack-mentoring mailing list
>>>>> openstack-mentoring at lists.openstack.org
>>>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-mentoring
>>>>>
>>>>
>>
>> --
>> Ruslanas Gžibovskis
>> +370 6030 7030
>>
>

-- 
Ruslanas Gžibovskis
+370 6030 7030
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