Reference Guide

Ingress Rate Limiting enforcement is needed only if the port can run at a speed higher than the rate limit. For example, if the rate limit is
4 Gbps and the port is only a 2-Gbps port, then Ingress Rate Limiting is not enforced.
The Ingress Rate Limiting configuration is persistent across reboots.
You should keep in mind the following considerations about Ingress Rate Limiting:
∙ Ingress Rate Limiting is applicable only to F_Ports and FL_Ports.
∙ QoS takes precedence over Ingress Rate Limiting.
∙ Ingress Rate Limiting is not enforced on trunked ports.
∙ Ingress Rate Limiting can also be used on simulation ports (SIM ports).
Virtual Fabrics considerations
If Virtual Fabrics is enabled and if a port is configured to have a certain rate limit value, you must first disable the rate limit on the port
before moving it to a different logical switch. Ports cannot be moved when they have rate limit configured on them.
Limiting traffic from a particular device
1. Connect to the switch and log in using an account with admin permissions.
2. Enter the portCfgQos --setratelimit command.
portcfgqos --setratelimit [slot/]port ratelimit
Example of setting the rate limit on slot 3, port 9 to 4000 Mbps
portcfgqos --setratelimit 3/9 4000
Disabling Ingress Rate Limiting
1. Connect to the switch and log in using an account with admin permissions.
2. Enter the portCfgQos --resetratelimit command.
portcfgqos --resetratelimit [slot/]port
Example of disabling Ingress Rate Limiting on slot 3, port 9
portcfgqos --resetratelimit 3/9
QoS
Quality of Service (QoS) allows you to categorize the traffic flow between a host and a target as having a high, medium, or low priority.
Fabric OS supports two types of prioritization:
∙ Class-Specific Control (CS_CTL)-based frame prioritization
Each frame between a host and a target is assigned a specific priority, depending on the value of the CS_CTL field in the frame header.
∙ QoS zone-based traffic prioritization
All traffic between a host and a target is assigned a specific priority, depending on the name you define for the QoS zone.
Optimizing Fabric Behavior
Brocade Fabric OS Administration Guide, 8.0.1
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