D-Link DXS-3600-EM-8T CLI Guide - Page 482

DXS-3600 Series 10GbE Layer 2/3 Switch CLI Reference Guide Command Mode Command Default Level Usage Guideline Policy-map Class Configuration Mode. Level: 15 Use the police tr-tcm cir command to drop a packet or mark a packet with different quality of service (QoS) values based on conformance to the service-level agreement. The user may specify multiple policing actions for a color packet, but can not specified contradictory actions at one time. That is, the user can specify action setdscp-transmit and set-1p-transmit for a color packet at one time, but can not specify the action transmit and drop for it. Two-rate traffic policing uses two token buckets (Tbc and Tbp) for policing traffic at two independent rates. The algorithm of color classify for this command is described following: • The two token buckets are initially (at time 0) full, that is, the token count Tbp (0) = PBS and the token count Tbc (0) = CBS. Thereafter, the token count Tbp is incremented by one pir times per second up to PBS and the token count Tbc is incremented by one cir times per second up to CBS. • When a packet of size B bytes arrives at time t, the following happens: a. If Tbp(t)-B < 0, the packet is red, else. b. If Tbc(t)-B < 0, the packet is yellow and Tbp is decremented by B, else. c. The packet is green and both Tbp and Tbc are decremented by B. The pir must be equal to or greater than the cir. The PBS and the CBS are measured in Kbytes and both of them must be configured to be greater than 0. It is recommended that they be configured to be equal to or greater than the size of the largest possible IP packet in the stream. In the policy-map class configuration mode, only one policer can be bind at one time. Example This example shows how to define a traffic class (using the class-map command) and associate the policy with the match criteria for the traffic class in a policy map (using the policy-map command). In the following example, two-rate traffic policing is configured on a class to limit traffic to an average committed rate of 2Mbps and a peak rate of 5Mbps. DXS-3600-32S#configure terminal DXS-3600-32S(config)#class-map class1 DXS-3600-32S(config-cmap)#match access-group 1 DXS-3600-32S(config-cmap)#exit DXS-3600-32S(config)#policy-map policy1 DXS-3600-32S(config-pmap)#class class1 DXS-3600-32S(config-pmap-c)#police tr-tcm cir 2000 bc 4096 pir 5000 be 2048 conform-action transmit exceed-action set-dscp-transmit 28 violate-action drop DXS-3600-32S(config-pmap-c)# 48-10 police rate This command is used to define a policer for classified traffic. A policer defines a maximum permissible rate of transmission, a maximum burst size for transmissions, and an action to take if either maximum is exceeded. Use the no police command to remove an existing policer . police rate bps burst-byte [exceed-action {drop | dscp dscp-value}] no police Parameters bps burst-byte Specifies the average rate in Kbps. Specifies the burst size in Kbyte. 474