Users Guide

mapping, see PFC configuration notes. A PFC traffic class requires a 1-to-1 mapping — only one dot1p
value is mapped to a qos-group number.
Example
OS10(config)# class-map type network-qos cc1
OS10(conf-cmap-nqos)# match qos-group 3
OS10(conf-cmap-nqos)# exit
Example (policy-
map)
OS10(config)# policy-map type network-qos pp1
OS10(conf-pmap-network-qos)# class cc1
OS10(conf-pmap-c-nqos)# pfc-cos 3
Supported
Releases
10.3.0E or later
pfc-shared-buffer-size
Configures the number 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 that is allowed for PFC-enabled flows. The configured number 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)# pfc-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 simultaneously on an interface. The no version of this command
disables PFC on an interface. When you disable PFC, delete 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
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