The vSphere Distributed Switch backup and restore functionality has been discussed in the VDS configuration backup and restore recipe of this chapter. One of the additional features of this functionality introduced in vSphere 5.1 is the ability to recover settings for a single port group instead of restoring configuration for the whole virtual switch.
This feature is useful in situations when the Distributed Switch has been misconfigured, which causes interruption or outage. Network rollback is enabled by default but can be disabled, which is not recommended.
If a change has been made to the virtual switch port group that unexpectedly broke, the required functionality administrator can perform the following steps to revert the port group configuration to the previous state:
Right-click on the Distributed Switch port group.
Go to All vCenter Actions and select Restore Configuration.
Choose the Restore to previous configuration option.
Click...