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> On 26 Feb 2016, at 9:20 AM, Carl Baldwin <carl at ecbaldwin.net> wrote:
> 
> (resending with reply-all)
> 
> The routed networks work will include a change to the DHCP scheduler
> which will work something like this:
> 
> 1. Neutron subnets will have optional affinity to a segment
> 2. DHCP agents will (somewhat indirectly) report which segments to
> which they are attached*.
> 3. Where today, DHCP schedules networks to DHCP agents, tomorrow DHCP
> will schedule each segment to an agent that can reach it.  This will
> be predicated on 'enable_dhcp' being set on the subnets.
> 
> There is an implicit assumption here that the operator will deploy a
> DHCP agent in each of the segments.  This will be documented in the
> guide.

I assume you’re referring to https://review.openstack.org/#/c/205631/ 
Really keen to get this in, we’re using this in prod and works well for us.

Sam




> Down the road, I really think we should continue to explore other
> possibilities like DHCP relay or a DHCP responder on the compute host.
> But, that should be considered an independent effort.
> 
> Carl
> 
> * they already do this by reporting physical_network in bridge mappings
> 
> On Thu, Feb 25, 2016 at 11:30 AM, Tim Bell <Tim.Bell at cern.ch> wrote:
>> 
>> The CERN guys had some concerns on how dhcp was working in a segment environment. I’ll leave them to give details.
>> 
>> Tim
>> 
>> 
>> 
>> 
>> 
>> On 25/02/16 14:53, "Andrew Laski" <andrew at lascii.com> wrote:
>> 
>>> 
>>> 
>>> On Thu, Feb 25, 2016, at 05:01 AM, Tim Bell wrote:
>>>> 
>>>> CERN info added.. Feel free to come back for more information if needed.
>>> 
>>> An additional piece of information we're specifically interested in from
>>> all cellsv1 deployments is around the networking control plane setup. Is
>>> there a single nova-net/Neutron deployment per region that is shared
>>> among cells? It appears that all cells users are splitting the network
>>> data plane into clusters/segments, are similar things being done to the
>>> control plane?
>>> 
>>> 
>>>> 
>>>> Tim
>>>> 
>>>> 
>>>> 
>>>> 
>>>> On 24/02/16 22:47, "Edgar Magana" <edgar.magana at workday.com> wrote:
>>>> 
>>>>> It will be awesome if we can add this doc into the networking guide  :-)
>>>>> 
>>>>> 
>>>>> Edgar
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> On 2/24/16, 1:42 PM, "Matt Riedemann" <mriedem at linux.vnet.ibm.com> wrote:
>>>>> 
>>>>>> The nova and neutron teams are trying to sort out existing deployment
>>>>>> network scenarios for cells v1 so we can try and document some of that
>>>>>> and get an idea if things change at all with cells v2.
>>>>>> 
>>>>>> Therefore we're asking that deployers running cells please document
>>>>>> anything you can in an etherpad [1].
>>>>>> 
>>>>>> We'll try to distill that for upstream docs at some point and then use
>>>>>> it as a reference when talking about cells v2 + networking.
>>>>>> 
>>>>>> [1] https://etherpad.openstack.org/p/cells-networking-use-cases
>>>>>> 
>>>>>> --
>>>>>> 
>>>>>> Thanks,
>>>>>> 
>>>>>> Matt Riedemann
>>>>>> 
>>>>>> 
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