Reference Guide
Congure PFC Example). A qos-group number is used only internally to classify ingress trac classes. See PFC
conguration notes for the default dot1p-priority-to-trac-class mapping and how to congure a non-default
mapping. A PFC trac 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-buer-size
Congures the amount of shared buers available for PFC-enabled trac on the switch.
Syntax
pfc-shared-buffer-size kilobytes
Parameter kilobytes — Enter the total amount of shared buers available to PFC-enabled dot1p trac in kilobytes (0 to
7787).
Default 832KB
Command Mode SYSTEM-QOS
Usage Information By default, all ingress trac is handled by the lossy ingress buer. When you enable PFC, dot1p ingress trac
competes for shared buers in the lossless pool instead of the shared lossy pool. Use this command to increase or
decrease the shared buer allowed for PFC-enabled ows. The congured amount of shared buers is reserved
for PFC ows only after you enable PFC on an interface (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-ow-control
Enables PFC on ingress interfaces.
Syntax
priority-flow-control {mode on}
Parameter mode on — Enable PFC for FCoE and iSCSI trac 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 specic 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 link-layer ow control (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
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