Connectivity Guide

Defaults
The default ingress-buffer size reserved for PFC traffic classes, and the pause and resume thresholds,
vary according to the interface type. The default egress buffer reserved for PFC traffic classes is 0 on all
interface types.
Table 69. Port defaults
Port Speed 10G Port 25G Port 40G Port 100G Port
PFC reserved ingress
buffer
166 KB 195 KB 315.5 KB 512 KB
PFC pause threshold 96 KB 96 KB 192 KB 232 KB
PFC resume threshold 87 KB 87 KB 183 KB 223 KB
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.
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 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 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 non-default
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
Converged data center services 1039