Content

| 10.1 |  | Ethernet Solutions for Transparent LAN Services |
| 10.1.1 |  | Same network, new services |

Customers today have moved beyond the need for basic point-to-point Internet circuits and legacy voice lines connecting PBX’s. With the steadily growing acceptance of Voice over IP (VoIP) systems, increased demand for Virtual Private Networks (VPNs), and expanding distributed mesh networking, as with mobile wireless, new systems have to be in place to support these infrastructures.

Transparent LAN services (TLS) bring to the service provider the ability to provide to the customer native LAN services over wide-area links without the need to implement complicated and costly Asynchronous Transfer Mode (ATM) networks. Figure shows a TLS solution connecting gigabit service through a Synchronous Optical Network (SONET)/dense wavelength division multiplexing (DWDM) infrastructure. The same optical infrastructure is being used to carry IP over Gigabit Ethernet services, a feature that allows the service provider to increase its offering over a common infrastructure. TLS can be incorporated into existing optical infrastructures.

The Cisco ONS 15327 and Cisco ONS 15454 platforms support TLS today through the addition of Ethernet service cards. This allows the migration or addition of TLS service offerings by service providers to existing optical network infrastructures without the need for costly equipment replacement. Through the addition of a single card, service providers can now offer additional TLS services to their clients.

The following concepts will be explored next:

- VLAN Tunneling
- Inter-Metro LAN Transport
- Inter-Service POP Connectivity
- Metro Segmentation