<div dir="ltr">We are "lucky" that external connectivity needs are limited. We have between 50-100 IP per L2 usually. We do not have huge pools of public IPs which are harder to handle/scale as with a public cloud.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, May 17, 2021 at 10:59 AM Arnaud Morin <<a href="mailto:arnaud.morin@gmail.com">arnaud.morin@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi Laurent,<br>
<br>
Thanks for your reply!<br>
I agree that it depends on the scale usage.<br>
About the VLAN you are using for external networks, do you have/want to<br>
share the number of public IP you have in this L2 for a region?<br>
<br>
Cheers,<br>
<br>
On 11.05.21 - 19:21, Laurent Dumont wrote:<br>
> I feel like it depends a lot on the scale/target usage (public vs private<br>
> cloud).<br>
> <br>
> But at $dayjob, we are leveraging<br>
> <br>
> - vlans for external networking (linux-bridge + OVS)<br>
> - vxlans for internal Openstack networks.<br>
> <br>
> We like the simplicity of vxlan with minimal overlay configuration. There<br>
> are some scaling/performance issues with stuff like l2 population.<br>
> <br>
> VLANs are okay but it's hard to predict the next 5 years of growth.<br>
> <br>
> On Mon, May 10, 2021 at 8:34 AM Arnaud Morin <<a href="mailto:arnaud.morin@gmail.com" target="_blank">arnaud.morin@gmail.com</a>> wrote:<br>
> <br>
> > Hey large-scalers,<br>
> ><br>
> > We had a discusion in my company (OVH) about neutron drivers.<br>
> > We are using a custom driver based on BGP for public networking, and<br>
> > another custom driver for private networking (based on vlan).<br>
> ><br>
> > Benefits from this are obvious:<br>
> > - we maintain the code<br>
> > - we do what we want, not more, not less<br>
> > - it fits perfectly to the network layer our company is using<br>
> > - we have full control of the networking stack<br>
> ><br>
> > But it also have some downsides:<br>
> > - we have to maintain the code... (rebasing, etc.)<br>
> > - we introduce bugs that are not upstream (more code, more bugs)<br>
> > - a change in code is taking longer, we have few people working on this<br>
> > (compared to a community based)<br>
> > - this is not upstream (so not opensource)<br>
> > - we are not sharing (bad)<br>
> ><br>
> > So, we were wondering which drivers are used upstream in large scale<br>
> > environment (not sure a vlan driver can be used with more than 500<br>
> > hypervisors / I dont know about vxlan or any other solution).<br>
> ><br>
> > Is there anyone willing to share this info?<br>
> ><br>
> > Thanks in advance!<br>
> ><br>
> ><br>
</blockquote></div>