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Deficit Weighted Round Robin (DWRR) vs. Class-based Weighted Fair Queuing (CBWFQ)

Hi,

 

I have read that,for instance, the ASR 903 (RSP3) only supports DWRR. 

In contrast an ASR9K supports Modified Deficit Round Robin (MDRR, a derivate of CBWFQ).

Unfortunately QoS config guides I've found doesn't refer to DWRR.

What are the differences in the config syntax for CBWFQ and DWRR?

Also, I'm very confused about the limitations of the queuing configuration.

I intended to configure this egress queuing  policy:

cfg.JPG

 

But it seems that egress queuing limitations on the ASR903vprevent this.

For example, configuring of a priority level at once with a rate policer shall be not allowed.

Currently, I'm not able to check this with real hardware. In VIRL all it's possible because in this environment no platform-specific limitations exist.

I would be grateful for any helpful hint!

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