Reference Guide

Congure PFC Example). A qos-group number is used only internally to classify ingress trac classes. See PFC
conguration notes for the default dot1p-priority-to-trac-class mapping and how to congure a non-default
mapping. A PFC trac 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-buer-size
Congures the amount of shared buers available for PFC-enabled trac on the switch.
Syntax
pfc-shared-buffer-size kilobytes
Parameter kilobytes — Enter the total amount of shared buers available to PFC-enabled dot1p trac in kilobytes (0 to
7787).
Default 832KB
Command Mode SYSTEM-QOS
Usage Information By default, all ingress trac is handled by the lossy ingress buer. When you enable PFC, dot1p ingress trac
competes for shared buers in the lossless pool instead of the shared lossy pool. Use this command to increase or
decrease the shared buer allowed for PFC-enabled ows. The congured amount of shared buers 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 trac 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 specic 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
546 Converged data center services