Cisco 3845 Software Guide - Page 535

Chapter 27 Configuring QoS Configuring QoS Switch(config-pmap-c)# exit Switch(config-pmap)# exit Switch(config)# interface gigabitethernet 0/1 Switch(config-if)# service-policy vlan Switch(config-if)# exit Configuring Class-Based Shaping You use the shape average policy-map class configuration command to configure traffic shaping. Class-based shaping sets the explicit maximum peak information rate (PIR) for the class by limiting it to the configured bandwidth. You can configure class-based shaping at the class level and at the VLAN level. Beginning in privileged EXEC mode, follow these steps to use class-based shaping to configure the maximum permitted average rate for a class of traffic: Step 1 Step 2 Command configure terminal policy-map policy-map-name Step 3 class {class-map-name | class-default} Step 4 shape average {target bps | percent value} Step 5 Step 6 Step 7 end show policy-map [policy-map-name [class class-map-name]] copy running-config startup-config Purpose Enter global configuration mode. Create a policy map by entering the policy map name, and enter policy-map configuration mode. Enter a child class-map name or class-default to match all unclassified packets, and enter policy-map class configuration mode. Specify the average class-based shaping rate. • For target bps, specify the average bit rate in bits per second. The range is from 1000 to 10000000000 (10 Gigabits). • Enter percent value to set the percentage of interface bandwidth for peak information rate. The range is 0 to 100 percent. The percentage is calculated based on the peak information rate (PIR) of the parent class. If there is no configured PIR at any level, this is the percentage of the interface speed. Setting the percent to 0 disables shaping. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. After you create the policy map, attach it to an interface or an EFP. See the "Attaching a Service Policy to an Interface or EFP" section on page 27-56. Use the no form of the appropriate command to delete an existing policy map or class map or to delete a class-based shaping configuration. This example shows how to configure traffic shaping for outgoing traffic on a Gigabit Ethernet port so that outclass1, outclass2, and outclass3 get a maximum of 50, 20, and 10 Mb/s of the available port bandwidth. Switch(config)# policy-map out-policy Switch(config-pmap)# class classout1 Switch(config-pmap-c)# shape average 50000000 Switch(config-pmap-c)# exit Switch(config-pmap)# class classout2 Switch(config-pmap-c)# shape average 20000000 Switch(config-pmap-c)# exit OL-23400-01 Cisco ME 3800X and 3600X Switch Software Configuration Guide 27-47