customer premises equipment dedicated to one particular business/enterprise
PE
service provider router that connects to a CE to provide a business VPN service
to the associated business/enterprise
CSC-CE
an ASBR/peering router that is connected to the CSC-PE of another service
provider for purposes of using the associated CsC IP VPN service for backbone
transport
CSC-PE
a PE router belonging to the backbone service provider that supports one or more
CSC IP VPN services