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Leave a space between each priority group number. For example: priority-pgid 0 0 0 1 2 4 4 4 in which
priority group 0 maps to dot1p priorities 0, 1, and 2; priority group 1 maps to dot1p priority 3; priority
group 2 maps to dot1p priority 4; priority group 4 maps to dot1p priorities 5, 6, and 7.
Dell Networking OS Behavior: As soon as you apply a DCB policy with PFC enabled on an interface, DCBx
starts exchanging information with PFC-enabled peers. The IEEE802.1Qbb, CEE, and CIN versions of PFC
Type, Length, Value (TLV) are supported. DCBx also validates PFC configurations that are received in TLVs
from peer devices.
NOTE:
You cannot enable PFC and link-level flow control at the same time on an interface.
Dell Networking OS does not support MACsec Bypass Capability (MBC).
NOTE:
We recommend that you do not use the dcb-policy input, dcb-policy output, dcb-
input, dcb-output, and priority-group commands as those are removed from Release 9.6.(0.0).
Configuring Lossless Queues
DCB also supports the manual configuration of lossless queues on an interface when PFC mode is turned off.
Prerequisite: A DCB with PFC configuration is applied to the interface with the following conditions:
•
PFC mode is off (no pfc mode on).
•
No PFC priority classes are configured (no pfc priority priority-range).
The configuration of no-drop queues provides flexibility for ports on which PFC is not needed but lossless
traffic should egress from the interface.
Lossless traffic egresses out the no-drop queues. Ingress dot1p traffic from PFC-enabled interfaces is
automatically mapped to the no-drop egress queues.
1
Enter INTERFACE Configuration mode.
CONFIGURATION mode
interface type slot/port
2
Configure the port queues that will still function as no-drop queues for lossless traffic.
INTERFACE mode
pfc no-drop queues queue-range
For the dot1p-queue assignments, refer to the dot1p Priority-Queue Assignment table.
The maximum number of lossless queues globally supported on the switch is two.
The default: No lossless queues are configured.
NOTE:
Dell Networking OS Behavior: By default, no lossless queues are configured on a port.
A limit of 4 lossless queues is supported on a port. If the amount of priority traffic that you configure to be
paused exceeds the 4 lossless queues, an error message displays.
Any pfc-dot1p priorities configured on a given interface need not be the same across the system, until the
total lossless queues configured on all the ports does not exceed the maximum lossless queues configured
globally. For example, one of the Te/Fo interfaces can have pfc-dot1p priorities as 2 and 3. Whereas, the other
Te/Fo interface(s) can have its pfc-dot1p priorities as 4 and 5.
Data Center Bridging (DCB)
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Troubleshooting
