When the Global Manager imports topology from the MPLS Topology Server, and that topology contains EVCs, the Global Manager runs a script that reads the EVC IDs of the EVCs. The script then proceeds as follows:
Contacts the underlying IP Availability Manager and retrieves the CE-VLAN IDs from the EVCEndPoints that match the EVC IDs.
Creates a CE-VLAN ServiceOffering object for each retrieved CE-VLAN ID and assigns a name to the ServiceOffering object (SO-CEVLAN<CE-VLAN ID>).
For each CE-VLAN ServiceOffering object, creates a LayeredOver relationship from the ServiceOffering object to the associated EVC object.
Business Impact Manager imports the CE-VLAN ServiceOffering objects from the Global Manager and subscribes to EVCEndPoint Down and EVC Impacted notifications.