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Metro Ethernet by Sam Halabi

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Example of an L2 Metro Ethernet Service

This section gives an example of an L2 metro Ethernet service and how all the parameters defined by the MEF are applied. The example attempts to highlight many of the definitions and concepts discussed in this chapter.

If you have noticed, the concept of VPNs is inherent in L2 Ethernet switching. The carrier VLAN is actually a VPN, and all customer sites within the same carrier VLAN form their own user group and exchange traffic independent of other customers on separate VLANs.

The issue of security arises in dealing with VLAN isolation between customers; however, because the metro network is owned by a central entity (such as the metro carrier), security is enforced. First of all, the access switches in ...

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