It will also address requirements driven by cloud computing services and data centers as they apply to Layer-2 VPN services. A L2VPN emulates a "native" service over a PSN that is adequately faithful to, but may not be entirely indistinguishable from the native service itself. Layer-2 VPNs comprise the following: 1. This service is similar to VPWS, but also supports heterogenous Attachment Circuits at either end of a single point-to-point service.

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Understanding Layer 2 VPNs

PW type: Represent the type of pseudowire. Group ID: Identifies the group of the pseudowire. Same group ID to all AC on the same interface. This is referred to wildcard label withdrawal. Because the MPLS header has no length that indicates the length of the frames, the control word holds a length field indicating the length of the frame.


Layer 2 VPN



MPLS L2VPN Pseudowire


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