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Layer 2 VPN Architectures by Anthony Chan, - CCIE No. 10,266, Dmitry Bokotey, - CCIE No. 4460, Carlos Pignataro, - CCIE No. 4619, Wei Luo, - CCIE No. 13,291

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Chapter 10. Understanding L2TPv3

This chapter covers the following topics:

As mentioned in Chapter 3, “Layer 2 VPN Architectures,” Layer 2 Tunnel Protocol Version 3 (L2TPv3) is an IP-based solution in the Cisco Unified VPN Suite that provides pseudowire emulation for a variety of Layer 2 protocols, including Ethernet, High-Level Data Link Control (HDLC), PPP, Frame Relay, and ATM. The base L2TPv3 protocol, which includes the control protocol and data encapsulation, is defined in the Layer 2 Tunnel Protocol Extensions (l2tpext) working group. At the time of this writing, the L2TPv3 base draft had not reached RFC status. Supplemental specifications that are particular to the data link protocols such as ATM are defined ...

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