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WRED on a CPE Ethernet/ISL


I've actually configured WRED with CBWFQ on a 7200 FE sub-interface ISL.

I've a "default-IP" and a "data-critic" class.

I test the Qos scheme when the link is a 110% of its "autorised" bandwidth.

The "data-critic" is putted at only 50% of its configured bandwidth , the "default-class" is putted at 250% of its configured bandwidth (in order to have 110% of charge of traffic on the link).

I see with the "packet generator" result and with "show policy-map" that about 1 to 4,5% of the packets of the "data-critic" class are dropped.

In fact, the mean queue is incremented at about 22 to 35 for the "data-critic" class.

My question is : is it normal to have the WRED mean queue of the "non-congested" class incremented when the link is congested by another class (in my case "default IP") or must the only "mean queue" of the "default-IP" be incremented ?

thanks in advance


Re: WRED on a CPE Ethernet/ISL

The average queue size does not change when there is no packet going through the queue. As soon as packets are flowing, the average will adjust accordingly. The mean queue size is the average and tracks the actual queue size very slowly.

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