weizhouapache commented on PR #13792:
URL: https://github.com/apache/cloudstack/pull/13792#issuecomment-5218633957

   > @weizhouapache Thanks. Just to clarify where this came from OVS/GRE was on 
a list of CloudStack areas/issues given to me by someone else running 
CloudStack to look into. It isn't something from my own deployment. We use 
VMware NSX and aren't using OVS/GRE.
   > 
   > I've looked further into the alternatives as well. CloudStack's native KVM 
VXLAN path is separate from the OVS/GRE implementation. Native VXLAN provides 
the L2 overlay and network-isolation transport, but CloudStack does not use 
that native VXLAN path to implement its distributed VPC router. The OVS 
provider additionally maintains VPC-wide host/tier/VM topology, distributed 
gateway information and ACL/routing policy on each participating host. 
Therefore native KVM VXLAN is an alternative to OVS/GRE for basic overlay 
transport, but it is not a direct replacement for the distributed-router 
functionality exercised by this PR.
   > 
   > I'm not attached to OVS/GRE as a direction for CloudStack. The PR fixes 
issues in code CloudStack currently carries, but if there aren't meaningful 
users of that path anymore and the better direction is to deprecate or remove 
it rather than continue maintaining it, that's completely fine with me and I'll 
drop the PR. If OVS/GRE is still considered supported functionality, I'll 
continue with the testing and the fix.
   
   thanks @Dogface2k 
   
   Your PRs are always more than welcome. The feature is still supported, but 
it may not be widely used. Personally, I don't know of any users who are 
actively using it at the moment. So there is no need to withdraw the PR.


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