Create An Evc Cross Connect; Create An Evc Cross Connect; Evc Definition - ADTRAN Total Access 5000 Deployment Manual

Total Access 5000 Business Services Deployment Guide

Create an EVC Cross Connect

This subsection details the following information:
• Definition of an EVC
• Guidelines for creating an EVC
• Steps for creating an EVC

EVC Definition

An EVC is a logical entity that provides a means for connecting two endpoints in the Total
Access 5000 and provides a path for Ethernet frames with a particular VLAN ID within the
Total Access 5000. The EVC cross‐connects two endpoints and provides the mechanism by
which an S‐tag path is created in the system. The S‐tag corresponds to the VLAN ID.
In the Total Access 5000, customer traffic switches throughout the system via S‐tags
(outermost VLAN tag on an Ethernet packet). Downstream traffic enters the system through
the network ports on the GigE SM and is S‐tag switched to the appropriate slot and PPP
group.
The Metro Ethernet Forum (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 Customer Equipment (CE) and the Metro Ethernet Network (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 the subscriber sites that are not part of the same EVC
Each EVC typically has an associated EVC VLAN tag whose VLAN ID is unique among other
EVCs in the MEN. The EVC VLAN tag allows the EVC to be identified and separated from
other EVCs.
At a minimum, two items must be set up for the EVC: the MEN interface it will use and the
S‐tag it will use.
The EVC specifies to which service provider VLAN the new PPP group interface is tied. It also
specifies the following:
• The upstream Metro Ethernet Network (MEN) ports: a Gigabit‐Ethernet port on the GigE
• The service provider VLAN (s‐tag)
5-12
frames
This capability enables an EVC to provide data privacy and security similar to a Frame
Relay or ATM Permanent Virtual Circuit (PVC).
SM, or a Gig‐E link aggregation group
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