Enterprise QoS Solution Reference Network Design Guide

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References 4-24 Enterprise QoS Solution Reference Network Design Guide Chapter 4 Branch Router QoS Design Version 3.3
Version 3.3 MPLS VPN QoS Design CHAPTER Enterprise QoS Solution Reference Network Design Guide 5 MPLS VPNs are rapidly gaining popularity as private-WAN alternatives. The migration to a MPLS VPN from a private-WAN requires a significant paradigm shift when addressing QoS designs. This is because enterprise customer subscribers must closely cooperate with their service providers to ensure end-to-end service-levels; they can no longer achieve these service-levels independent of their service provider's policies. MPLS VPN QoS design can be viewed from two distinct perspectives: The enterprise customer subscribing to the MPLS VPN service The service provider provisioning edge and core QoS within the MPLS VPN service To achieve end-to-end service levels, both enterprise and service-provider QoS designs must be consistent and complimentary. This design chapter will focus primarily on the enterprise customer’s perspective, yet elements of the service provider's side of the equation will also be included to round out the picture and to better convey how the two sides fit together. Furthermore, as some enterprises self-manage their MPLS VPNs, it is important to examine both elements of the QoS solution. The following topics are discussed in this design chapter: Enterprise-to-Service Provider Mapping Models Service Provider-to-Enterprise Models MPLS DiffServ Tunneling Modes MPLS is a combination of routing and switching technologies that can provide scalable VPNs with end-to-end quality of service. Many enterprise customers are turning to service providers that offer MPLS VPN services as private WAN alternatives. One of the main reasons for this is the any-to-any connectivity capabilities of MPLS VPNs. However, this full-mesh nature in itself poses significant QoS implications to enterprise customers and service providers alike—namely, that they both need to comanage QoS in a cooperative and complementary fashion to achieve end-to-end service levels. This chapter examines in detail QoS considerations that enterprise customers need to bear in mind when subscribing to MPLS VPNs, including how best to map into various service-provider MPLS VPN QoS models. Service provider-edge QoS considerations are also presented, including egress queuing models and MPLS DiffServ tunneling modes (Uniform, Short Pipe, and Pipe). 5-1
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