HP Cisco Nexus 5000 Cisco MDS 9000 Family CLI Configuration Guide - Release 4. - Page 430

Configuring Module Interface Shared Resources Chapter 15 Configuring Generation 2 and Generation 3 Switching Modules Send documentation comments to [email protected] As of Cisco SAN-OS Release 3.1(2), all 48-port and 24-port 4-Gbps Fibre Channel switching modules, as well as 18-port Fibre Channel/4-port Gigabit Ethernet Multiservice modules, have bandwidth fairness enabled by default. As of Cisco NX-OS Release 4.1(1), all the 8-Gbps Fibre Channel switching modules have bandwidth fairness enabled by default. Caution When you disable or enable bandwidth fairness, the change does not take effect until you reload the module. Use the show module bandwidth-fairness command to check whether ports in a module are operating with bandwidth fairness enabled or disabled. switch# show module 2 bandwidth-fairness Module 2 bandwidth-fairness is enabled Note This feature is supported only on the 48-port and 24-port 4-Gbps modules, the 8-Gbps modules, and the 18/4-port Multiservice Module (MSM). Enabling Bandwidth Fairness To enable bandwidth fairness on a switching module, follow these steps: Step 1 Step 2 Command switch# config t switch(config)# switch(config)# rate-mode bandwidth-fairness module 1 Step 3 switch(config)# exit Purpose Enters configuration mode. Enables bandwidth fairness for a module. Note You must enter this command separately for each module for which you want to enable bandwidth fairness. You must reload the module for the command to take effect. Exits configuration mode. Disabling Bandwidth Fairness Note If you disable bandwidth fairness, up to a 20 percent increase in internal bandwidth allocation is possible for each port group; however, bandwidth fairness is not guaranteed when there is a mix of shared and full-rate ports in the same port group. To disable bandwidth fairness on a switching module, follow these steps: Step 1 Command switch# config t switch(config)# Purpose Enters configuration mode. 15-46 Cisco MDS 9000 Family CLI Configuration Guide OL-18084-01, Cisco MDS NX-OS Release 4.x