5000 Series Layer 2/3 Managed Data Center Switch CLI Reference Guide
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congestion unaware. This setting disables detection of congestion on
the priority.
Default
The default is Disabled QCN Priorities.
Command Mode
Data Center Bridging Config
6-9
qcn cnpv-priority alternate-priority
The
qcn cnpv-priority alternate-priority
command is used in the Global Configuration mode in order to
globally configure the alternate priority of the selected cnpv-priority, such that when a frame with a dot1p
priority equal to the congestion notification priority value is received, the priority value in the frame will be
remarked with the alternate priority. The alternate priority is only applied to incoming frames if the dot1p
priority of the incoming frame is equal to the Congestion Notification Priority Value (CNPV) priority of the
CP and the CP is configured as Edge.
The alternate priority setting is used to steer away any traffic that is sent from CN-unaware sources.
When entering the Congestion Notification Domain (CND) domain, traffic from non-congestion aware
sources is remarked so that those resources granted to the congestion-enabled queues will not be
exhausted with traffic from QCN unaware sources. Since those frames are being sent from non-QCN
sources, they will not have a CN-TAG. As such, if the frames are mapped to the congestion-enabled
queue, they may contribute to congestion and, as a result, trigger the generation of CNMs. This is not
helpful for sources that are QCN-unaware.
This configuration will be applied to all the ports for which the defense-mode-choice is configured as
component.
The
no
command is used in the Global Configuration mode to reset the alternate priority back to the
default value.
qcn cnpv-priority cnpv-priority alternate-priority non-cnpv-priority
no qcn cnpv-priority cnpv-priority alternate-priority
Parameters
cnpv-priority
The range is 0-7.
non-cnpv-priority
The range of alternate priority is 0-7.
Default
The default is None.
Command Mode
Global Config
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