Traffic Leaving Enterprise Network

Managed CE

Managed CE

Output QoS policy on CE controlled by service provider

Service provider enforces SLA using the output QoS policy on CE

Output policy uses queuing, dropping, and possibly shaping

Elaborate traffic classification or mapping of existing markings

May require LFI or cRTP

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Dnmanaged CE

Dnmanaged CE

Output QoS policy on CE not controlled by service provider

Output QoS policy on CE not controlled by service provider

Service provider enforces SLA using input QoS policy on PE

Input policy uses policing and marking

Elaborate traffic classification or mapping of existing markings on PE

The QoS requirements on the CE and PE router will differ, depending on whether the CE is managed by the service provider.

For traffic leaving the enterprise CE router and moving toward the service provider PE router, the figure illustrates the general QoS requirements on the CE and PE routers.

For managed CE service, the WAN edge output QoS policy on the CE will be managed and configured by the service provider.

For unmanaged CE service, the WAN edge output QoS policy on the CE will be managed and configured by the enterprise customer.

For managed CE service, the service provider can enforce the SLA for each traffic class using the output QoS policy on the CE. For example, you can use LLQ or CBWFQ to give a maximum bandwidth guarantee to the real-time voice and video traffic class, give a minimum bandwidth guarantee to the data traffic class, and use class-based shaping to provide a maximum rate limit to each data traffic class.

For unmanaged CE service, because the service provider has no control of the CE, the service provider can only enforce the SLA for each traffic class at the input of the PE router. For example, you can use class-based policing to rate-limit the input traffic rate of the different traffic classes and to re-mark the exceeding traffic.

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