Core issue
Cisco IOS quality of service (QoS) offers two kinds of traffic regulation mechanisms traffic policing and traffic shaping. A traffic policer typically drops traffic that violates a specific rate. A traffic shaper typically delays excess traffic with a buffer to hold packets and shapes the flow when the data rate to a queue is higher than expected.
This feature provides the ability to configure traffic policing and traffic shaping based on a percentage of bandwidth available on the interface. The configuration of traffic policing and shaping based on a percentage of bandwidth is accomplished with the use of the police (percent) and shape (percent) commands.
This command calculates the committed information rate (CIR) based on a percentage of the available bandwidth on the interface.
Resolution
In the platform of Catalyst 6500 PFC QoS, the configuration of the police rate with percentage values are not supported.
As a workaround, it is recommended to use the exact bit rate in order to police the traffic as shown in this example:
policy-map < policy name >
class < class map name >
police cir 128000 bc 8000 be 8000 conform-action transmit exceed-action drop
class < class map name >
police cir 32000 bc 8000 be 8000 conform-action transmit exceed-action
Refer to these documents for more information:
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