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Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 64 Configuring Fabric Congestion Control and QoS
Ingress Port Rate Limiting
Congestion could occur anywhere in the example configuration. To address congestion of the return path
at both switches, you need to create two more class maps and include them in the policy map as follows:
Step 1 Create two more class maps.
Step 2 Assign the class maps to the policy map.
Step 3 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 using Fabric Manager, follow these steps:
Step 1 Expand Switches, expand FC Services and then select QoS in the Physical Attributes pane.
The QoS control traffic information is displayed in the Information pane shown in Figure 64-8. The
default is the Control tab.
Figure 64-8 Quality of Service Control Tab
Step 2
Click the Rate Limit tab.
You see the information shown in Figure 64-9.
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