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Download Cisco Systems 6500 Switch User Manual
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Chapter 2 Catalyst 6500 Series Switch and ROM Monitor Commands set qos policer The excess rate must be greater than or equal to the normal rate. The set qos policer aggregate command allows you to configure an aggregate flow and a policing rule for that aggregate. When you enter the microflow microflow_name rate rate burst burst, the range for the average rate is 32 kilobits per second to 8 gigabits per second, and the range for the burst size is 1 kilobit (entered as 1) to 32 megabits (entered as 32000). The burst can be set lower, higher, or equal to the rate. Modifying an existing aggregate rate limit entry causes that entry to be modified in NVRAM and in the switch if that entry is currently being used. Note We recommend a 32-kilobit minimum value burst size. Due to the nature of the traffic at different customer sites, along with the hardware configuration, smaller values occasionally result in lower rates than the specified rate. If you experiment with smaller values but problems occur, increase the burst rate to this minimum recommended value. When you modify an existing microflow or aggregate rate limit, that entry in NVRAM is modified, as well as in the switch if it is currently being used. When you enter the policing name, follow these naming conventions: • Maximum of 31 characters long and may include a through z, A through Z, 0 through 9, the dash character (-), the underscore character (_), and the period character (.) • Must start with an alpha character and must be unique across all ACLs of all types • Case sensitive • Cannot be a number • Must not be a keyword; keywords to avoid are all, default-action, map, help, and editbuffer The burst keyword and the burst value and the optional eburst keyword and the eburst value set the token bucket sizes. To sustain a specific rate, set the token bucket size to be at least the rate divided by 4000, because tokens are removed from the bucket every 1/4000th of a second (0.25 milliseconds) and the bucket needs to be at least as large as the burst size to sustain the specified rate. If you do not enter the eburst keyword and the eburst value, QoS sets both token buckets to the size configured with the burst keyword and the burst value. Examples This example shows how to create a microflow policing rule for ACL: Console> (enable) set qos policer microflow my-micro rate 1000 burst 10000 policed-dscp QoS policer for microflow my-micro set successfully. Console> (enable) These examples show how to create an aggregate policing rule for ACL: Console> (enable) set qos policer aggregate my-agg rate 1000 burst 2000 drop QoS policer for aggregate my-aggset successfully. Console> (enable) Console> (enable) set qos policer aggregate test3 rate 64 policed-dscp erate 128 drop burst 96 QoS policer for aggregate test3 created successfully. Console> (enable) Related Commands clear qos policer show qos policer Catalyst 6500 Series Switch Command Reference—Release 8.1 2-503 78-15474-01
