By Wei Luo, Carlos Pignataro, Anthony Chan, Dmitry Bokotey
An entire advisor to figuring out, designing, and deploying Layer 2 VPN applied sciences and pseudowire emulation applications
- overview industry drivers for Layer 2 VPNs comprehend the architectural frame-work and offerings for Layer 2 VPNs, together with AToM and L2TPv3 clutch the necessities of Layer 2 LAN and WAN applied sciences learn the theoretical and operational information of MPLS and LDP as they pertain to AToM comprehend the theoretical and operational information of Layer 2 protocols over L2TPv3 in IP networks know about Layer 2 VPN bridged and routed interworking and Layer 2 neighborhood switching comprehend the operation and alertness of digital inner most LAN providers (VPLS) find out about origin and complex AToM and L2TPv3 subject matters via an intensive choice of case studies
The ancient disconnect among legacy Layer 2 and Layer three VPN options has compelled carrier companies to construct, function, and retain separate infrastructures to house a number of VPN entry applied sciences. This expensive proposition, besides the fact that, is not any longer beneficial. As a part of its new Unified VPN Suite, Cisco structures® now deals next-generation Layer 2 VPN providers like Layer 2 Tunneling Protocol model three (L2TPv3) and Any shipping over MPLS (AToM) that permit provider companies to supply body Relay, ATM, Ethernet, and leased-line providers over a standard IP/MPLS middle community. through unifying a number of community layers and supplying an built-in set of software program providers and administration instruments over this infrastructure, the Cisco® Layer 2 VPN answer permits proven companies, IP-oriented ISP/CLECs, and big firm consumers (LECs) to arrive a broader set of power VPN buyers and provide really worldwide VPNs.
Layer 2 VPN Architectures is a complete advisor to consolidating community infrastructures and increasing VPN companies. The publication opens through discussing Layer 2 VPN purposes using either AToM and L2TPv3 protocols and evaluating Layer three as opposed to Layer 2 provider-provisioned VPNs. as well as describing the options on the topic of Layer 2 VPNs, this ebook presents an intensive selection of case reports that exhibit you ways those applied sciences and architectures paintings. The case experiences comprise either AToM and L2TPv3 and exhibit real-world merchant and company layout difficulties and suggestions with hands-on configuration examples and implementation info. The case stories contain all Layer 2 applied sciences transported utilizing AToM and L2TPv3 pseudowires, together with Ethernet, Ethernet VLAN, HDLC, PPP, body Relay, ATM AAL5 and ATM cells, and complicated issues appropriate to Layer 2 VPN deployment, resembling QoS and scalability.
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Additional resources for Layer 2 Vpn Architectures Mar
Also, the typical Layer 2 VPNs deployed today are rarely fully meshed because having a fully meshed flat network creates scaling problems for Layer 3 routing, where hierarchy is desired. If a Layer 2 VPN consists only of sparse point-to-point connections, advertising the information of a CE to all other PE devices and keeping it on these PE devices waste network resources because such information is only interesting to a single remote PE. Not exhaustively, Table 2-1 compares the most noticeable characteristics of the two Layer 2 VPN architectures that are defined by draft-martini and draft-kompella.
Because the alternate path is set up prior to the link failure, rerouting can take place rather quickly. Interoperability A rapidly growing number of service providers and network equipment vendors have become involved in the development and interoperability testing for the MPLS-based pseudowire emulation products. AToM is the Cisco product for pseudowire emulation over MPLS networks. As the protocol specification and implementation have matured over the past couple of years, the standardsbased pseudowire emulation products from different equipment vendors have achieved an excellent level of interoperability.
When you use manual configuration, you do not need to establish control connection between PE routers. The next sections give an overview of L2TPv3 from the following aspects: L2TPv3 operations Supported Layer 2 protocols Decision factors whether to use L2TPv3 in your network, such as installation base, advanced features, and complexity L2TPv3 Operations Even though L2TP is labeled as an IP-based technology, it is in fact a transport-independent protocol. L2TPv2, which is mostly deployed for remote access applications, specifies mechanisms to tunnel Layer 2 frames over UDP, ATM AAL5, and Frame Relay.