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Hi,

On Wed, Nov 13, 2019 at 04:31:20AM +0000, James Denton wrote:
> Appreciate the summary as well.
> 
> For what it's worth, the ML2/LinuxBridge combo has been a very stable setup for us since its inception, and I'd hate to see it deprecated and removed for the sake of removing something. Last I checked, trunk ports were supported with the ML2/LinuxBridge driver. And while of course DVR is not a supported feature, a good number of our ML2/LXB environments forgo Neutron routers altogether in favor of putting VMs on the provider network. It has shown to be as performant as vanilla OVS, and a simpler model to implement and support as an operator.

You're right. Trunk ports are ofcourse supported by LB agent. But e.g. some of
QoS rules aren't supported by this backend.

> 
> Just my two cents.
> 
> Thanks,
> 
> James Denton
> Network Engineer
> Rackspace Private Cloud
> james.denton at rackspace.com
> 
> On 11/12/19, 3:41 PM, "Tim Bell" <Tim.Bell at cern.ch> wrote:
> 
>     CAUTION: This message originated externally, please use caution when clicking on links or opening attachments!
>     
>     
>     Many thanks for the summaries. It’s really helpful for those who could not be in the discussions.
>     
>     CERN are also using ML2/Linuxbridge so we’d welcome being involved in any deprecation discussions and migration paths.
>     
>     Tim
>     
>     > On 12 Nov 2019, at 14:53, Slawek Kaplonski <skaplons at redhat.com> wrote:
>     >
>     > Hi Neutron team,
>     >
>     > First if all thank to all of You for great and very productive week during the
>     > PTG in Shanghai.
>     > Below is summary of our discussions from whole 3 days.
>     > If I forgot about something, please respond to the email and update missing
>     > informations. But if You want to have follow up discussion about one of the
>     > topics from this summary, please start a new thread to keep this one only as
>     > high level summary of the PTG.
>     >
>     > ...
>     
>     > Starting the process of removing ML2/Linuxbridge
>     > ================================================
>     >
>     > Currently in Neutron tree we have 4 drivers:
>     > * Linuxbridge,
>     > * Openvswitch,
>     > * macvtap,
>     > * sriov.
>     > SR-IOV driver is out of discussion here as this driver is
>     > addressing slightly different use case than other out drivers.
>     >
>     > We started discussion about above topic because we don't want to end up with too
>     > many drivers in-tree and we also had some discussions (and we have spec for that
>     > already) about include networking-ovn as in-tree driver.
>     > So with networking-ovn in-tree we would have already 4 drivers which can be used
>     > on any hardware: linuxbridge, ovs, macvtap and ovn.
>     > Conclusions from the discussion are:
>     > * each driver requires proper testing in the gate, so we need to add many new
>     >  jobs to our check/gate queue,
>     > * currently linuxbridge driver don't have a lot of development and feature
>     >  parity gaps between linuxbridge and ovs drivers is getting bigger and bigger
>     >  (e.g. dvr, trunk ports),
>     > * also macvtap driver don't have a lot of activity in last few cycles. Maybe
>     >  this one could be also considered as candidate to deprecation,
>     > * we need to have process of deprecating some drivers and time horizon for such
>     >  actions should be at least 2 cycles.
>     > * we will not remove any driver completly but rather we will move it to be in
>     >  stadium process first so it still can be maintained by people who are
>     >  interested in it.
>     >
>     > Actions to do after this discussion:
>     > * Miguel Lavalle will contact RAX and Godaddy (we know that those are
>     >  Linuxbridge users currently) to ask about their feedback about this,
>     > * if there are any other companies using LB driver, Nate Johnston is willing to
>     >  help conctating them, please reach to him in such case.
>     > * we may ratify marking linuxbridge as deprecated in the team meeting during
>     >  Ussuri cycle if nothing surprising pops in.
>     >
>     
>     
> 

-- 
Slawek Kaplonski
Senior software engineer
Red Hat