wido opened a new pull request, #13107:
URL: https://github.com/apache/cloudstack/pull/13107

   ### Description
   Using the 'network.vxlan.mode' setting you can switch between the multicast 
(default) and evpn VXLAN modes on a KVM Agent.
   
   When nothing is configured CloudStack will default to multicast by using the 
modifyvxlan.sh script in the background. If this setting is set to 'evpn' the 
KVM Agent will execute the 'modifyvxlan-evpn.sh' script which will configure 
the VXLAN devices for EVPN (usually with FRRouting with BGP) mode.
   
   This removes the need to manually replace a shell script on the hypervisor 
to switch modes.
   
   Existing environments are not touched by this and it is safe to add this 
setting a an environment already using EVPN for the VXLAN deployment.
   
   ### Types of changes
   
   - [ ] Breaking change (fix or feature that would cause existing 
functionality to change)
   - [ ] New feature (non-breaking change which adds functionality)
   - [ ] Bug fix (non-breaking change which fixes an issue)
   - [x] Enhancement (improves an existing feature and functionality)
   - [ ] Cleanup (Code refactoring and cleanup, that may add test cases)
   - [ ] Build/CI
   - [ ] Test (unit or integration test code)
   
   ### Feature/Enhancement Scale or Bug Severity
   
   #### Feature/Enhancement Scale
   
   - [ ] Major
   - [x] Minor
   


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