Enterprise QoS Solution Reference Network Design Guide

Chapter 5 MPLS VPN QoS Design
Service Provider Service-Level Agreements
Version 3.3
Customer Edge QoS Design Considerations
End-to-end QoS is like a chain that is only as strong as the weakest link. Therefore, it’s essential for
enterprises (with converged networks) subscribing to MPLS VPN services to choose service providers
that can provide the required SLAs for their converged networks. For example, these are the end-to-end
SLA requirements of voice and interactive video:
No more than 150 ms of one-way latency from mouth to ear (per ITU G.114 standard)
No more than 30 ms of jitter
No more than 1 percent loss
As a subset of the trip, the service provider’s component of the SLA must be considerably tighter. These
SLAs are defined for Cisco-Powered Networks (CPN)–IP Multiservice Service Providers:
No more than 60 ms of one-way latency from edge to edge
No more than 20 ms of jitter
No more than 0.5 percent loss
Figure 5-4 illustrates the interrelationship of these SLAs.
CPN-IP Multiservice Service Providers that meet these SLAs can be found at
http://www.cisco.com/pcgi-bin/cpn/cpn_pub_bassrch.pl
Choose the IP VPN Multiservice option.
To achieve such end-to-end SLAs, enterprise customers (managing CEs) and service providers
(managing PEs and core Ps) must cooperate and be consistent in classifying, provisioning, and
integrating their respective QoS designs. To this end, various mapping models have been developed to
integrate enterprise requirements into service-provider solutions.
Enterprise QoS Solution Reference Network Design Guide
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