Users Guide

Command Mode POLICY-CLASS NETWORK-QOS
Usage Information Use the pause command without optional parameters to apply the default ingress-buffer size, and pause (XON)
and resume (XOFF) thresholds. Default values for the buffer-size, pause-threshold and resume-
threshold parameters vary across interface types and port speeds. The default values are based on the default
MTU size of 9216 bytes. Use the optional queue-limit thresh-mode command to change the number of
shared buffers available to PFC traffic-class queues in the policy-class-map.
Example
OS10(config)# policy-map type network-qos pp1
OS10(conf-pmap-network-qos)# class cc1
OS10(conf-pmap-c-nqos)# pause buffer-size 30 pause-threshold 20 resume-
threshold 10
Supported
Releases
10.3.0E or later
pfc-cos
Configures the matching dot1p values that are used to send PFC pause frames.
Syntax
pfc-cos dot1p-priority
Parameters dot1p-priority — Enter a single dot1p priority value for a PFC traffic class, from 1 to 7, a hyphen-separated
range, or multiple dot1p values separated by commas.
Default Not configured
Command Mode POLICY-CLASS NETWORK-QOS
Usage Information When you enter PFC-enabled dot1p priorities with pfc-cos, the dot1p values must be the same as the match
qos-group (traffic class) numbers in the network-qos class map that is used to define the PFC traffic class, see
Configure PFC Example. A qos-group number is used only internally to classify ingress traffic classes. For the
default dot1p-priority-to-traffic-class mapping and how to configure a nondefault 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.
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