The system may use MPLS TP LSPs, and PWs, to transport point to point virtual leased line services. The router may play the role of a terminating PE or switching PE for VLLs. Epipe, Apipe, and Cpipe VLL services of type Epipe and Cpipe. The router may play the role of a switching PE for an Apipe service.
Figure: MPLS-TP provider edge and gateway, VLL services illustrates the use of the system as a T-PE for services in an MPLS-TP domain, and as a S-PE for services between an MPLS-TP domain and an IP/MPLS domain. Static PWs with MPLS-TP identifiers, originating in the MPLS-TP network, are transported over static MPLS-TP LSPs. These either terminate on a local SAP on the system, or are switched to another PW segment across the IP/MPLS network. The PW segment in the IP/MPLS network may have static labels or be signaled using T-LDP.
