If you are using VRC integrated with PTC, the PTC Topology Manager maintains element configuration information.
Element configuration information includes:
Cisco IOS version for the element, host name, and IP address
Information related to the configuration of trunk groups, Ethernet ports, voice ports, and access lists on gateways
When you make changes to element configuration by using the PTC Topology Manager:
PTC updates its database and notifies VRC that the element configuration has changed.
VRC validates the change and PTC sets a reactivate flag on the gateway, if it exists, in both the VRC Baseline View and the VRC Design View.
You cannot commit a design that has one or more gateways with the reactivate flag set.
Refer to Reactivating an Element for more information.