rhtyd commented on issue #2293: CLOUDSTACK-10047: DVSwitch fixes and 
improvements
URL: https://github.com/apache/cloudstack/pull/2293#issuecomment-335728971
 
 
   Notes:
   - Portgroup creation and update is triggered primarily by StartCommand for a 
network (when a VM is started, here VM could be either a guest VM or a VR, 
therefore VM start and VR start triggered by network deployment or network 
restart with cleanup=true).
   - While processing StartCommand, the subsystem reconfigures the 
nics/portgroups/disks etc which is not possible when simply doing a VM 
reboot/restart from CloudStack, which is why portgroups changes are not 
applied/propagated when doing VM reboot via CloudStack which send a Vm reboot 
to vmware.
   - The global settings will apply for (cloud.public, cloud.guest and 
cloud.private) portgroups, while if network offering has the security policies 
defined the defined policies will be applied to cloud.guest (i.e. the guest/vm 
network specific portgroup) otherwise that will too use the global settings
   - The feature is primarily intended for new networks and/or 
network-offerings, and if old/existing network offerings are used then global 
settings will be used. 
   - The security policies/behaviour is same as vswitches, i.e. promiscuous 
mode set to false, and others set to true. By default, dvswitch would 
previously set promiscuous mode to true which would be both an overhead and 
security issue.
 
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