Connectivity Guide

pfc-shared-buffer-size
Configures the amount of shared buffers available for PFC-enabled traffic on the switch.
Syntax
pfc-shared-buffer-size kilobytes
Parameter kilobytes — Enter the total amount of shared buffers available to PFC-enabled dot1p traffic in
kilobytes, from 0 to 7787.
Default 832KB
Command Mode SYSTEM-QOS
Usage
Information
By default, the lossy ingress buffer handles all ingress traffic. When you enable PFC, dot1p ingress traffic
competes for shared buffers in the lossless pool instead of the shared lossy pool. Use this command to
increase or decrease the shared buffer allowed for PFC-enabled flows. The configured amount of shared
buffers is reserved for PFC flows only after you enable PFC on an interface using the priority-flow-
control mode on command.
Example
OS10(config)# system qos
OS10(conf-sys-qos)# pause-shared-buffer-size 1024
Supported
Releases
10.3.0E or later
priority-flow-control
Enables PFC on ingress interfaces.
Syntax
priority-flow-control {mode on}
Parameter mode on — Enable PFC for FCoE and iSCSI traffic on an interface without enabling DCBX.
Default Disabled
Command Mode INTERFACE
Usage
Information
Before you enable PFC, apply a network-qos policy-class map with the specific PFC dot1p priority values
to the interface. In the PFC network-qos policy-class map, use the default buffer-size values if you
are not sure about the pause-threshold and resume-threshold settings that you want to use.
You cannot enable PFC and LLFC at the same time on an interface. The no version of this command
disables PFC on an interface. When you disable PFC, remove the PFC network-qos policy-class map
applied to the interface.
Example
OS10(conf-if-eth1/1/1)# priority-flow-control mode on
Supported
Releases
10.3.0E or later
queue-limit
Sets the static and dynamic thresholds used to limit the shared-buffer size of PFC traffic-class queues.
Syntax
queue-limit {thresh-mode [static kilobytes | dynamic weight]}
Parameters
● thresh-mode — Buffer threshold mode.
● static kilobytes — Enter the fixed shared-buffer limit available for PFC traffic-class queues in
kilobytes, from 0 to 7787; maximum amount tuned by the pfc-shared-buffer-size command.
● dynamic weight — Enter the weight value used to dynamically determine the shared-buffer limit
available for PFC traffic-class queuesm from 1 to 10.
Default Dynamic weight of 9 and static shared-buffer limit of 12479488 kilobytes
Command Mode POLICY-CLASS NETWORK-QOS
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