Cisco Systems OL-21636-01 E

E-1

Cisco IP Solution Center L2VPN and Carrier Ethernet User Guide, 6.0

OL-21636-01

APPENDIX

This appendix provides an overview of ISC Layer 2 VP N concepts. It contains the following sections.

• Layer 2 Terminology Conventions, page E-1

• L2VPN Service Provisioning, page E-5

• VPLS Service Provisioning, page E-10

Layer 2 service provisioning for the IP Solution Center (ISC) consists of the Laye r 2 Virtual Private

Network (L2VPN) Service and the Virtual Private LAN Service (VPLS). The purpose of this section is

to clarify the terminologies used in ISC, as well in the industry at large, for these services.

There are three sets of terminologies in use:

• The current Metro Ethernet Forum (MEF) terminology

• The former MEF terminology

• ISC terminology (which is close to the former MEF terminology)

In general, for L2VPN services, the MEF supports two general Ethernet servic e type constructs:

• Ethernet Line (E-Line). Provides a point-to-point Ethe rnet Virtual Circuit (EVC).

• Ethernet LAN (E-LAN). Provides a multipoint-to-m ultipoint EVC.

Two Ethernet services are available for each type. These are distinguished by the means of service

identification used at the user-to-network interface (UNIs), as follows:

• Port based. All-to-one bundling. These are referred to as “private.”

• VLAN-based. These services are multiplexed. The EVC is identified by a VLAN ID. These are

referred as “virtual private.”

Tabl e E-1 summarizes these relationships.