An EPL is depicted in Figure 2.13.
NOTE MEF 6.1 might incorporate a further distinction in the Ethernet Private
Line; specifically, there is consensus to define two EPL service variants: EPL-T (EPLTransport)
and EPL-P (EPL-Packet). EPL-T would essentially be the EPL defined here.
EPL-T would be enhanced, adding features such as multiple CoS parameters as well as
bandwidth profile parameters.
Ethernet Virtual Private Line (EVPL) Using E-LINE Service Type An Ethernet Virtual
Private Line (EVPL) is created using an E-LINE service type. An EVPL can be used to
create services similar to the Ethernet Private Line (EPL) with some notable exceptions.
First, an EVPL allows for service multiplexing at the UNI. This capability allows more
than one EVC to be supported at the UNI whereas the EPL does not allow this. Second, an
EVPL need not provide full transparency of service frames as with an EPL. Because service
multiplexing is permitted, some service frames may be sent to one EVC while other
service frames may be sent to other EVCs. An EVPL is also shown in Figure 2.13.
Figure 2.13 Examples of services using the E-LINE service type (Source: MEF)
Example Services Using E-LINE Service Type
Point-to-Point EVC Storage SP
Ethernet
UNI
Ethernet
UNI Ethernet
UNI
Ethernet
UNI
Ethernet
UNI
Ethernet
UNI
Multiple Point-to-Point EVCs
MEN MEN
ISP
POP
CE
CE
CE
CE
Service
Multiplexed
Ethernet
UNI
Internet
Ethernet Private Line
Using E-LINE Service Type
Ethernet Virtual Private Line (EVPL)
??? Replaces Frame Relay or ATM Services
??? Supports Services Multiplexed UNI*
??? Allows Single Physical Connection to Customer
Premise Equipment for Multiple Virtual Connections
Ethernet Private Line (EPL)
??? Replaces a TDM Private Line
??? Dedicated UNIs for Point-to-Point
Connections
??? Single Ethernet Virtual Connection
(EVC) per UNI
Ethernet Vertual Private Line
Using E-LINE Service Type
CE
CE
Carrier Ethernet 73
Ethernet Private LAN (E-PLAN) Using E-LAN Service Type E-PLAN enables a
wide area LAN Ethernet in which service multiplexing is allowed at the UNI.
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