GitHub user cisco-abrandel added a comment to the discussion: Cloudstack 
creates VLAN sub-interface on wrong interface on KVM

I was seeing what I *thought* were issues related to this, but it turns out the 
issues were elsewhere. For full disclosure, we're running some small KVM test 
hosts on VMware, and has promiscuous enabled for the port group. This caused 
some minor looping of packets, one side effect of which was the linux bridge 
learned the KVM guests MAC on the wrong port occasionally, causing traffic 
blackholing. The solution for our specific topology was to disable promiscuous 
on the VMware port group the KVM host are in, and instead use MAC learning on 
the DVS. 

GitHub link: 
https://github.com/apache/cloudstack/discussions/11940#discussioncomment-14831858

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