Brocade Fabric OS Administrators Guide (Supporting Fabric OS v7.3.0) - Manual (Page 377)

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.
CS_CTL-based frame prioritization and QoS zone-based traffic prioritization are mutually exclusive. If
you enable CS_CTL-based frame prioritization on F_Ports or FL_Ports, then QoS zone-based traffic
prioritization cannot be used between any devices connected to the F_Ports or FL_Ports.
CS_CTL-based frame prioritization takes precedence over QoS zone-based traffic prioritization. If you
enable CS_CTL-based frame prioritization on F_Ports or FL_Ports that are defined in a QoS zone,
CS_CTL-based frame prioritization takes precedence over the QoS zones.
The following table shows a basic comparison between CS-CTL-based frame prioritization and QoS
zone-based traffic prioritization. Refer to
CS_CTL-based frame prioritization on page 378 and QoS
zone-based traffic prioritization on page 381 for detailed information about each type of prioritization
scheme.
Comparison between CS_CTL-based and QoS zone-based prioritization TABLE 74
CS_CTL-based frame prioritization QoS zone-based traffic prioritization
Must be manually enabled. Automatically enabled.
No zones are required. Requires you to create QoS zones.
Enabled on F_Ports or FL_Ports. Enabled on E_Ports.
Takes precedence over QoS zone-based traffic prioritization. Is overridden by CS_CTL-based frame prioritization.
Priority is defined by CS-CTL field in frame header. Priority is defined by name of QoS zone.
Prioritization is on a frame-basis. Prioritization is on a flow-basis.
Disabling Ingress Rate Limiting
Fabric OS Administrators Guide 377
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