In this example, the E-LAN service type may be used to interconnect
other subscriber sites while the E-LINE service type is used to connect to the Internet
with both services offered via EVC service multiplexing at the same UNI.
An E-LAN service may include a different bandwidth profile
CM> configured at each of the UNIs. An E-LAN service can also interconnect a large
number of sites with much less complexity than legacy technologies such as Frame
Relay and ATM. Furthermore, it can be used to create a broad range of services such
as Private LAN and Virtual Private LAN service.
Ethernet Private and Virtual Connectivity Services Using the E-LINE and E-LAN service
types, the MEF has also defined simple connectivity services based on whether they are
port-based or VLAN-based. The port-based service, where all-to-one bundling is employed,
is essentially providing a private service with dedicated bandwidth, while the
VLAN-based service allows service multiplexing at a UNI to enable a virtual service, in
which bandwidth is shared among multiple EVCs. This is detailed in Figure 2.12.
Figure 2.11 E-LAN service type using Multipoint-to-Multipoint EVC (Source: MEF)
Multipoint-to-Multipoint EVC
UNI
MEN
UNI
UNI
UNI
CE
CE
CE
CE
Figure 2.
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