L2 VPN—Any to Any Interworking
You have seen that Layer 2 VPN is possible with like-to-like ACs such as HDLC-to-HDLC. In the forthcoming subsections, you will be introduced to L2 VPN implementation between different types of attachment circuits like Ethernet-to-PPP and so on. This function of translating different Layer 2 encapsulations is also called L2 VPN Interworking. L2 VPN Interworking, therefore, provides service providers with the ability to interconnect sites using different transport mediums on a common infrastructure. The common infrastructure is the MPLS backbone, which facilitates the interworking functionality of translating between various Layer 2 technologies. The L2 VPN Interworking feature supports Ethernet, 802.1Q (VLAN), ...
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