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Webcast-Catalyst9k
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QoS parameters for queuing

Hello,

about configuring QoS queuing on Catalyst 6500 sup720 3c line card 6708 and also on GSR Line card sip600

I can understand very well why on Catalyst i must configure two parameters for each class like:

  • wrr-queue queue-limit (Transmit-Queue Size Ratio)
  • wrr-queue bandwidth percent

while on the GSR i just need to configure the

  • bandwidth percent

Takea look of two example of configuration:

Catalyst:

interface   TYPE SLOT/PORT

wrr-queue   queue-limit Q1 Q2 Q3 0 0 0 0

!

priority-queue   queue-limit QP

!

wrr-queue   bandwidth percent A B C 0 0 0 0

!

priority-queue   cos-map 1 Cos5

!

wrr-queue   cos-map 1 1 Cos 3

wrr-queue   cos-map 2 1 Cos 2

wrr-queue   cos-map 3 1 Cos 1

GSR

interface TYPE SLOT/PORT

service-policy output QUEUING

!

policy-map QUEUING

  class CLASS_A

    priority

    police A                    

  class CLASS_B

    bandwidth percent B

  class CLASS_C

    bandwidth percent C

  class class-default

    bandwidth percent D

So, my question is what does the queue-limit command does? Why it is not needed when I configure MQC on GSR?

Thank you

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