Traffic Leaving Service Provider Network Cont

Managed CE

Managed CE

Input Policy <Not needed>

Output Policy LLQ WRED [Shaping] [LFI or cRTP]

Unmanaged CE

Unmanaged CE

Unmanaged CE

Input Policy <Irrelevant>

Output Policy LLQ WRED [Shaping] [LFI or cRTP]

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For traffic leaving the service provider PE router toward the enterprise CE router, the figure illustrates the different QoS mechanisms that are commonly implemented at the PE router.

For both managed and unmanaged CE service, the service provider typically has an output policy on the PE router using LLQ and/or CBWFQ, and WRED, for congestion management and congestion avoidance. To compensate for speed mismatch or oversubscription, traffic shaping may be required. To improve the link efficiency, LFI and cRTP are used.

A customer edge input policy is not required for managed and unmanaged CE services.

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