Chapter 21
| Data Center Bridging Commands
Congestion Notification Commands
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cn cnpv
alternate-priority
(Global Configuration)
Use this command to configure the alternate priority used to remark a received
frame when its dot1p priority is equal to the CNPV when the defense mode is other
than auto. Use the no form restore the default setting.
Syntax
cn cnpv cnpv-priority alternate-priority priority
no cn cnpv cnpv-priority alternate-priority
cnpv-priority - CN priority value. (Range: 0-7)
priority - Remarked priority value. (Range: 0-7)
Default Setting
Alternate Priority: 0
Command Mode
Global Configuration
Command Usage
â—† Use the alternate priority to steer away traffic that comes from congestion
unaware sources. Traffic from CN unaware sources should be remarked when
entering the CN domain so that resources assigned to the CN-enabled queues
are not exhausted with traffic from CN unaware sources. Frames coming from
non-CN sources do not have a CN-TAG. If these frames are mapped to the CN-
enabled queue, then they may contribute to the congestion and trigger
generation of CNMs. These messages are not useful to sources that are CN
unaware.
â—† If a port's neighbor is known to be configured for a particular CNPV, the entry in
the port's priority regeneration table for that CNPV is ignored, and the priority
is never changed on input.
â—† If a port's neighbor is known to not be configured for a particular CNPV
configured on this port, the entry in the port's priority regeneration table for
that CNPV shall be overridden to translate the CNPV to an alternate non-CNPV
value.
â—† If a CNPV is configured on any port, then on that port, the port's priority
regeneration table shall be overridden to prevent any other priority value from
being remapped into that CNPV.
Example
The following example maps CNPV 2 to alternate priority 5.
Console(config)#cn cnpv 2 alternate-priority 5
Console(config)#
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