I have only 4 classes of traffic
- Mission critical data
- Best Effort (BE)
The bulk of the traffic in the network is Best Effort (DSCP=0).
Using 1P3Q8T queue structure in SRND
wrr-queue queue-limit 5 25 40
wrr-queue bandwidth 5 25 70
wrr-queue cos map 1 1 1
wrr-queue cos map 2 1 0
wrr-queue cos map 3 1 4
wrr-queue cos map 3 2 2
wrr-queue cos map 3 3 3
wrr-queue cos map 3 4 6
wrr-queue cos map 3 5 7
priority-queue cos-map 4 5
With the above, if the bulk Best Effort (BE) traffic is COS=0, the second queue will be used, which has a queue limit=25, wrr bandwidth=25%.
If I do not have any traffic like COS=2,4, can the BE traffic go beyond the bandwidth of 25%?
based on the Cat6500 configuration guide, it states:
"WRR allows queue to use more than the allocated bandwidth if the
other queues are not using any, up to the total bandwidth of the port."
If this is true, then I should be able to follow SRND's setting even if i do not have so many classes of traffic. With the SRND settings, it also allows me the flexibility of increasing the number of classes in future without having to reconfigure the switches.
Any comments/thoughts are welcome.