
Chapter 4: Feature Description
Ethernet Features
Figure 33 E-Tree Service Type Using Multiple Roots
Service multiplexing is optional and may occur on any combination of UNIs in the EVC. For
example, an E-Tree service type using a Rooted-Multipoint EVC, and an E-Line service type using a
Point-to-Point EVC, can be service multiplexed on the same UNI. In this example, the E-Tree
service type can be used to support a specific application at the Subscriber UNI, e.g., ISP access to
redundant PoPs (multiple Roots at ISP PoPs), while the E-Line Service type is used to connect to
another enterprise site with a Point-to-Point EVC.
Ethernet Private Tree Service
The Ethernet Private Tree service (EP-Tree) is designed to supply the flexibility for configuring
multiple sites so that the services are distributed from a centralized site, or from a few centralized
sites. In this setup, the centralized site or sites are designed as Roots, while the remaining sites are
designated as Leaves. CE-VLAN tags are preserved and key Layer 2 control protocols are tunneled.
The advantage of such a configuration is that the customer can configure VLANs across its sites
without the need to coordinate with the service provider. Each interface is configured for All-to-
One Bundling, which means that EP-Tree services support CE-VLAN ID preservation. EP-Tree also
supports CE-VLAN CoS preservation. EP-Tree requires dedication of the UNIs to the single EP-Tree
service. The following figure provides an example of an EP-Tree service.
Figure 34 MEF Ethernet Private Tree Example
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