Chapter 21
| Data Center Bridging Commands
Congestion Notification Commands
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cn Use this command to enable congestion notification for all ports on the switch. Use
the no form to disabled congestion notification on the switch.
Syntax
[no] cn
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
When CN is enabled, the system recognizes the CN-TAG in received frames, the
Connection Point (CP) algorithm and Reaction Points (RP) algorithm runs on the
configured CPs and Congestion Notification Messages (CNMs) are transmitted if
congestion is detected on a CP.
Example
The following example enables CN for all ports.
Console(config)#interface ethernet 1/5
Console(config-if)#traffic-class map 2 1
Console(config-if)#traffic-class map 3 1
Console(config-if)#
cn cnm-
transmit-priority
Use this command to configure the dot1p priority used for transmitting any
Congestion Notification Message (CNM). Use the no form to restore the default
setting.
Syntax
cn cnm-transmit-priority priority
no cn cnm-transmit-priority
priority - dot1p priority used to transmit any CNM. (Range: 0-7)
Default Setting
0
Command Mode
Global Configuration
Command Usage
The specified priority should not be equal to any existing Congestion Notification
Priority Value (CNPV).
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