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 innovations through introductory case experiences and complete layout situations. This ebook assists readers trying to meet these requisites by means of explaining the background and implementation info of the 2 applied sciences to be had 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 ebook is targeted on first introducing the reader to Layer 2 VPN advantages and implementation standards and evaluating them to these of Layer three established VPNs, resembling MPLS, then gradually masking each one at the moment to be had answer in higher element.
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Extra info for Layer 2 VPN architectures
ATM over MPLS includes two types of ATM services: • ATM AAL5 • ATM Cell With ATM AAL5, PE routers either receive ATM AAL5 packets or reassemble ATM cells into ATM AAL5 packets from CE routers and forward them to different pseudowires based on the receiving interface and the VPI or VCI values. The ingress PE router drops all other packets except operations, administration, and maintenance (OAM) cells. The ATM flags, such as explicit forward congestion indication (EFCI) and cell loss priority (CLP), are carried in the pseudowire control word, which is also mandatory for ATM AAL5 over MPLS.
This section examines how AToM replaces legacy Layer 2 VPNs and the new features it offers. AToM is a pseudowire emulation application that is part of the Unified VPN Suite Solution that Cisco offers to transport Layer 2 traffic over an MPLS network. Besides providing the end-to-end connectivity of the same Layer 2 protocol, AToM is capable of interconnecting disparate Layer 2 protocols through Layer 2 interworking. AToM derives from a series of efforts by service providers and network equipment vendors in an attempt to minimize the impact to existing Layer 2 VPN services and create new service offerings with MPLS-enabled networks.
The efficiency with which a service provider utilizes its network infrastructure has a significant impact on the cost structure of its business. The more efficient the use of network resources, the less capital investment that a service provider has to make to provide the desired level of service offering. Traffic engineering aims at solving the problem that some parts of the network are highly congested while others are underutilized. MPLS solves the traffic engineering problem that plain IP routing cannot solve by using MPLS constraint-based routing.