Figure 25: Ethernet Vll Frame With Mpls Encapsulation; Figure 26: Epipe Service - Alcatel-Lucent 7705 Service Manual

Ethernet VLL (Epipe) Services
Figure 25
An Epipe service is a Layer 2 point-to-point service where the customer data is encapsulated
and transported across a service provider's MPLS or IP network. An Epipe service is
completely transparent to the subscriber's data and protocols. Like other PW VLL services,
Epipe service behaves like a non-learning Ethernet bridge. A distributed Epipe service
consists of a SAP and an SDP pair, where one SDP is on same router as the SAP, and the
second SDP is on the far-end router.
Each SAP configuration includes a specific port on which service traffic enters the
7705 SAR from the customer side (also called the access side). Each port is configured with
an encapsulation type (SAP encapsulation). Thus, a whole Ethernet port can be bound to a
single service (that is, the whole Ethernet port is configured as a SAP), or if a port is
configured for IEEE 802.1Q encapsulation (referred to as dot1q), then a unique
encapsulation value (ID) must be specified.
Customer 1
Customer 2
Page 160
shows a typical Ethernet VLL frame together with its MPLS tunnel encapsulation:

Figure 25: Ethernet VLL Frame with MPLS Encapsulation

7
Ethernet II
Preamble SFD
Frame
4 4
MPLS Tunnel PW Label

Figure 26: Epipe Service

Service 1
Service 2
1 6 6 2 2
DA SA TPID VLAN | Prio
TCI
802.1p/q (optional)
Payload
IP/MPLS network
Epipe (VLL)
Epipe (VLL)
7705 SAR OS Services Guide
2 42/46-1500 4 bytes
Ethertype Payload FCS
19767
Customer 2
Customer 1
19483