By Wei Luo, Carlos Pignataro CCIE, Anthony Chan, Dmitry Bokotey
Layer 2 VPN Architectures introduces readers to Layer 2 digital deepest community (VPN) techniques, and describes Layer 2 VPN concepts through introductory case reports and finished layout situations. This e-book assists readers trying to meet these standards through explaining the heritage and implementation info of the 2 applied sciences on hand from the Cisco Unified VPN suite: Any shipping over MPLS (ATOM) for MPLS-based cores and Layer 2 Tunneling Protocol model three (L2TPv3) for local IP cores. The constitution of this booklet is concentrated on first introducing the reader to Layer 2 VPN advantages and implementation necessities and evaluating them to these of Layer three dependent VPNs, similar to MPLS, then steadily protecting each one at the moment to be had answer in larger aspect.
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Extra resources for Layer 2 VPN architectures
By such an arrangement, each CE can derive which attachment circuit connects to which remote CE. Each PE is then configured with the VPNs in which it participates. Each VPN is denoted by a VPN ID. The PE is provisioned with a list of CE devices that are members of a given VPN. The PE also knows the CE ID, CE range, and the index values for the attachment circuits of each CE. When a PE is configured with all the necessary information for a CE, it allocates a contiguous range of MPLS labels that corresponds to the CE range.
Ethernet is now the world's most widely used LAN protocol. Ethernet uses carrier sense multiple access collision detect (CSMA-CD). The different parts of this protocol are as follows: • Carrier sense Before transmitting data, stations check whether other stations are already transmitting over the multiaccess wire. If other stations are not transmitting, the station can transmit data or wait. • Multiple access All stations are connected to a single physical wire or a single data path. • Collision detect If a collision is detected because two stations transmitted data into the wire simultaneously, both stations stop transmitting, back off, and try again later after a random delay.
48 Part I: Foundation Part I: Foundation 49 Advanced Network Services Because L2TPv3 uses IP or UDP as its transport layer, integrating with advanced IP-based network services, such as IPSec, is easy. If service providers manage Layer 2 VPN services for their customers, the strong security guarantee that is provided within the service provider network can be sold as a value-added feature. If enterprises manage Layer 2 VPN services, this combination gives them not only site-to-site Layer 2 connectivity but data integrity and privacy when transporting sensitive information across public or shared network infrastructures.
Layer 2 VPN architectures by Wei Luo, Carlos Pignataro CCIE, Anthony Chan, Dmitry Bokotey