Evcs; Evc Attributes; Name; Configuration Status - ADTRAN Total Access 5000 Deployment Manual

Total Access 5000 Business Services Deployment Guide

EVCs

The MEF defines an EVC as "an association of two or more UNIs," where a UNI is a standard
10/100/1000 Ethernet interface that is the point of demarcation between the CE and the MEN
of the service provider. In simple terms, an EVC performs two functions.
• Connects two or more subscriber sites (UNIs) enabling the transfer of Ethernet service
• Prevents data transfer between subscriber sites that are not part of the same EVC
Multiple EVCs can reside on a common bonding group or Ethernet port. Each EVC has an
associated EVC whose VLAN ID is unique among other EVCs in the MEN. The EVC s‐tag
allows the EVC to be identified and separated from other EVCs within the MEN. The EVC s‐
tag exists only within the MEN and is not transmitted from or received at the CE.
The MEF defines Ethernet Line (E‐Line) services as a service that provides a point‐to‐point
EVC that connects exactly two UNIs.

EVC Attributes

The attributes of an EVC are described in the following paragraphs.

Name

This attribute is an arbitrary string that is used to identify the EVC within the MEN. The value
must be unique across all EVCs defined in the network element, and is intended for
management and control purposes. The value is not carried in any field in the Ethernet frame.
As an example, the Acme Service Provider can use "EVC‐0001898‐ACME‐MEGAMART" to
represent the 1898th EVC in the MEN. In this example, the customer for the EVC is MegaMart.

Configuration Status

This read‐only attribute indicates the current status of the EVC. The EVC can be administra‐
tively enabled, but can not be in the functional state if it is not fully configured or if a conflict
exists. If the EVC is not applied due to the configuration or a conflict, refer to Table F‐3 for a
lists of the possible values.
Possible Values
Running
Missing Connection
Tag Conflict
Disabled
System‐management‐evc Con‐
flict
F-4
frames
This capability enables an EVC to provide data privacy and security similar to a Frame
Relay or ATM Permanent Virtual Circuit (PVC).

Table F-3. EVC Status Values

Definition
Conditions are okay and the EVC provisioning is applied.
The EVC is not connected to enough active interfaces. The mini‐
mum required is two. The active interface can be directly con‐
nected by MEN‐port or mapped UNI.
Another EVC is administratively enabled and configured to use
the same s‐tag.
The State value of the EVC is provisioned as disabled.
The EVC s‐tag is in use by the system management EVC.
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