Re: [PATCH net-next v2 07/12] rtnetlink: add new rtm tunnel api for tunnel id filtering

On Tue, 22 Feb 2022 22:31:18 -0800 Roopa Prabhu wrote:

quoted

Makes sense. I wasn't quite sure if this isn't over-engineering
  - do deployments really use VxLAN devs with many VNIs?  

yes, vnis are unfortunately used to stretch layer 2 domains exceeding 
the 4k vlan limit

In the example provided in this series, vnis can be deployed in the 
ranges of more than 15k if each customer is allocated a 4k vlan range 
(bridge domain),

and a single switch can host 3-4 customers.

the scale is also the reason to switch to dst metadata devices when 
deployed vni numbers get large. The traditional vxlan netdev per vni 
does not work well at this scale.

Ah, now it all clicked together, thanks!