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Unable to configure the QoS related Police CIR percent commands in Catalyst 6500 series switches that run Cisco IOS

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:

For further assistance and support, open a service request with the TAC Service Request Tool.

Version history
Revision #:
1 of 1
Last update:
‎06-17-2009 10:17 PM
Updated by:
 
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