To connect only two sites,
a Point-to-Point E-LINE service can be used. To connect three or more sites, the subscriber
has the choice of using either multiple E-LINE services or an E-LAN service.
Figure 2.15 shows a four-site LAN extension created using an E-LAN service. Each
of the sites/UNIs support CE-VLAN ID and CE-VLAN preservation so the subscriber??™s
Figure 2.14 E-PLAN using E-LAN service type (Source: MEF)
TLS Makes the MEN
Look Like a LAN
??? Transparent LAN Service
(TLS) Provides
??“ Multipoint-multipoint
??“ Intra-company Connectivity
??“ Full Transparency of Control
Protocols (BPDUs)
??? New VLANs Added
??“ Without Coordination with
Provider
Transparent LAN Service
Multipoint-to-
Multipoint EVC
UNI 1
UNI
3
UNI 4
UNI 1
UNI
MEN
VLANs
Engineering
Sales
Customer Service
Engineering
VLANs
VLANs
Sales
VLANs
Sales
Customer Service
2
74 Chapter 2
VLAN tag is not modified. In this case, the MEN appears as a single Ethernet segment
in which any site can be a member of any VLAN. The advantage here is the subscriber
can configure new CE-VLANs across these sites without involving the Service Provider.
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