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Webcast-Catalyst9k
New Member

QoS : traffic shaping and buffer size

Hi,

The traffic shaping consist in delaying packets when the traffic rate exceeds the traffic contract (shaping rate during each Tc)

How can I know the size of the shaper buffer ? I mean how much packets can be delayed ? There should be a limit ! I guess I can know how many packets are in buffer (column queue depth in the output of "show policy-map interface") but I don't find information on the queue depth. Is it configurable ?

Thank you

Thomas

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: QoS : traffic shaping and buffer size

If you want to adjust the queue limit per class, you can modify that in the class configuration by typing "queue-limit n" where n is the number of packets. The default queue-limit is usually 64 or 128 packets depending on the IOS version.

3 REPLIES
Cisco Employee

Re: QoS : traffic shaping and buffer size

If you want to adjust the queue limit per class, you can modify that in the class configuration by typing "queue-limit n" where n is the number of packets. The default queue-limit is usually 64 or 128 packets depending on the IOS version.

New Member

Re: QoS : traffic shaping and buffer size

Hi,

Thank you for your answer.

I just saw another command a few minutes ago, I didn't notice it before : "shape max-buffers N"

What is the difference in this case with "queue-limit N" ?

Thank you

Thomas

Cisco Employee

Re: QoS : traffic shaping and buffer size

Same functionality, just depends on the IOS you are running. Newer IOS deprecated shape max-buffers so you only use queue-limit.

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