HP Cisco Nexus 5000 Cisco MDS 9000 Family CLI Configuration Guide - Release 4. - Page 1368

Ingress Port Rate Limiting Chapter 56 Configuring Fabric Congestion Control and QoS Send documentation comments to [email protected] Step 3 Switch 2(config-pmap)# exit Switch 2(config)# Repeat Step 1 through Step 2 on Switch 1 to address return path congestion at both switches. Ingress Port Rate Limiting A port rate limiting feature helps control the bandwidth for individual Fibre Channel ports. Port rate limiting is also referred to as ingress rate limiting because it controls ingress traffic into a Fibre Channel port. The feature controls traffic flow by limiting the number of frames that are transmitted out of the exit point on the MAC. Port rate limiting works on all Fibre Channel ports. The rate limit ranges from 1 to 100% and the default is 100%. Note Port rate limiting can only be configured on Cisco MDS 9100 Series switches, Cisco MDS 9216i switches, and MPS-14/2 modules. This feature can only be configured if the QoS feature is enabled and if this configuration is performed on a Cisco MDS 9100 series switch, Cisco MDS 9216i switch, or MPS-14/2 module. To configure the port rate limiting value, follow these steps: Step 1 Step 2 Step 3 Command Purpose switch # config t switch(config)# Enters the configuration mode. switch(config)# interface fc 1/1 Selects the interface to specify the ingress port rate limit. switch(config-if)# switchport ingress-rate 50 Configures a 50% port rate limit for the selected interface. switch(config-if)# no switchport ingress-rate 50 Reverts a previously configured rate to the factory default of 100%. Default Settings Table 56-3 lists the default settings for FCC, QoS, and rate limiting features. . Table 56-3 Default FCC, QoS, and Rate Limiting Settings Parameters FCC protocol QoS control traffic QoS data traffic Zone-based QoS priority Rate limit Default Disabled. Enabled. Disabled. Low. 100%. 56-14 Cisco MDS 9000 Family CLI Configuration Guide OL-18084-01, Cisco MDS NX-OS Release 4.x