weizhouapache commented on issue #11491:
URL: https://github.com/apache/cloudstack/issues/11491#issuecomment-4124577778

   > I tested this and basically just changing the tags allowed on the vnet 
interface makes it work if connected to an L2 network that runs untagged (and 
as such directly connected to the physical network bridge).
   > 
   > I don't know if such a quick fix is desirable or if a solution similar to 
openstack is more wanted (bundle networks under a parent network and custom tag 
each of these). Something similar to openstack can have benefits as it better 
supports VXLAN as well.
   > 
   > As for the benefits, having a trunk reduces the virtual interrupts which 
increases efficiency. On VNF VMs with dozens of NICs passing moderate traffic, 
it can save some CPU cycles, especially on edge zones.
   
   @draggeta 
   
   Thanks for the testing. Good to hear
   
   The VM configuration looks straightforward, as you mentioned.
   
   The potential challenges may include:
   - How VLANs are managed (the OpenStack approach works, but may not be ideal 
in this context)
   - Handling VLAN tags in the KVM plugin, which could impact VM operations 
such as start and migration
   - Ensuring the current network configuration continues to function as 
expected (NICs attached to Linux bridges with VLAN tags, e.g., breth1-XXX)
   


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