Cisco WS-SUP32-GE-3B Software Configuration Guide - Page 584

Configuring PFC QoS Chapter 38 Configuring PFC QoS This example shows how to enable egress ACL support for remarked DSCP on Fast Ethernet port 5/36: Router# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)# interface fastethernet 5/36 Router(config-if)# platform ip features sequential Router(config-if)# end Creating Named Aggregate Policers To create a named aggregate policer, perform this task: Command Purpose Router(config)# mls qos aggregate-policer policer_name bits_per_second normal_burst_bytes [maximum_burst_bytes] [pir peak_rate_bps] [[[conform-action {drop | set-dscp-transmit1 dscp_value | set-prec-transmit1 ip_precedence_value | transmit}] exceed-action {drop | policed-dscp | transmit}] violate-action {drop | policed-dscp | transmit}] Creates a named aggregate policer. Router(config)# no mls qos aggregate-policer policer_name Deletes a named aggregate policer. 1. The set-dscp-transmit and set-prec-transmit keywords are only supported for IP traffic. When creating a named aggregate policer, note the following information: • You can apply aggregate policers to IPv6 traffic. • With a PFC3B, policing uses the Layer 2 frame size. • See the "PFC QoS Configuration Guidelines and Restrictions" section on page 38-39 for information about rate and burst size granularity. • The valid range of values for the CIR bits_per_second parameter is as follows: - Minimum-32 kilobits per second, entered as 32000 - Maximum-10 gigabits per second, entered as 10000000000 • The normal_burst_bytes parameter sets the CIR token bucket size. • The maximum_burst_bytes parameter sets the PIR token bucket size. • When configuring the size of a token bucket, note the following information: - The minimum token bucket size is 1 kilobyte, entered as 1000 (the maximum_burst_bytes parameter must be set larger than the normal_burst_bytes parameter). - The maximum token bucket size is 32 megabytes, entered as 32000000. - To sustain a specific rate, set the token bucket size to be at least the rate value divided by 4000 because tokens are removed from the bucket every 1/4000th of a second (0.25 ms). - Because the token bucket must be large enough to hold at least one frame, set the parameter larger than the maximum size of the traffic being policed. - For TCP traffic, configure the token bucket size as a multiple of the TCP window size, with a minimum value at least twice as large as the maximum size of the traffic being policed. 38-50 Catalyst Supervisor Engine 32 PISA Cisco IOS Software Configuration Guide, Release 12.2ZY OL-11439-03