An Epipe service is a Layer 2 point-to-point service where the customer data is encapsulated and transported across a service provider network. An Epipe service is completely transparent to the subscriber data and protocols. The Epipe service does not perform any MAC learning. A local Epipe service consists of two SAPs on the same node, whereas a distributed Epipe service consists of two SAPs on different nodes.
Each SAP configuration includes a specific port on which service traffic enters the 7210 SAS from the customer side (also called the access side). Each port is configured with an encapsulation type. If a port is configured with an IEEE 802.1Q (referred to as dot1q) encapsulation, then a unique encapsulation value (ID) must be specified.
The following figure shows Epipe/VLL service.
