This attribute holds the Customer Identifier (CID).
Every component has a CID. If a component has a cid attribute, the
component's CID is the provisioned value of that attribute;
otherwise the component inherits the CID of its parent. The top-
level component has a CID of 0.
Every operator session also has a CID, which is the CID
provisioned for the operator's user ID. An operator will see only the
stream data for components having a matching CID. Also, the
operator will be allowed to issue commands for only those
components which have a matching CID.
An operator CID of 0 is used to identify the Network Manager
(referred to as 'NetMan' in DPN). This CID matches the CID of
any component. Values 1 to 8191 inclusive (equivalent to 'basic
CIDs' in DPN) may be assigned to specific customers.