Difference between (QoS) exceed and violate?

[John Peterson]

On the process of configuring QoS for Nexus I have come across both commands which "seem" to describe the same action. 

While looking into this further, it explains one can be used to mark traffic - but this can be achieved by both.

http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx-os/qos/command/reference/qos_commands.html#wp1226736

"Exceed - Sets the action to take when the data rate is exceeded. The default is drop."

"Violate - Sets the action to take when the data rate violates the configured rate values. The default is drop."

Anybody have any experience with these commands and where they should be used?

Thank you.

John.

[milan.kulik]

Hi,

when PIR is used, Exceed action is applied on packets exceeding CIR but below PIR, Violate action is applied on packets above PIR.

Best regards,

Milan

[John Peterson]

Hi Milan,

Does this also relate when policing traffic in QoS?

[milan.kulik]

Yes,

you can assign different DSCP values to traffic exceeding and violating, e.g.

Best regards,

Milan

[Joseph W. Doherty]

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Posting

Yes, it can be so used.  For example, traffic that's within CIR might be marked AFx1, same traffic that's above CIR but below PIR might be marked AFx2, and same traffic over PIR might be marked AFx3.