Reference Guide

Data Center Bridging | 471
Command
History
Usage
Information
If you apply an input policy with PFC disabled (no pfc mode on):
• Link-level flow control can be enabled on the interface. To delete the input policy, you must first
disable link-level flow control. PFC is then enabled automatically on the interface because an
interface is by default PFC-enabled.
• PFC still allows you to configure lossless queues on a port to ensure no-drop handling of lossless
traffic.
When you apply an input policy to an interface, an error message is displayed if:
• The PFC dot1p priorities result in more than two lossless port queues globally on the switch.
• Link-level flow control is already enabled. PFC and link-level flow control cannot be enabled at
the same time on an interface.
In a switch stack, you must configure all stacked ports with the same PFC configuration.
A DCB input policy for PFC applied to an interface may become invalid if the dot1p-queue mapping is
reconfigured. This situation occurs when the new dot1p-queue assignment exceeds the maximum
number (2) of lossless queues supported globally on the switch. In this case, all PFC configurations
received from PFC-enabled peers are removed and re-synchronized with the peer devices.
Traffic may be interrupted when you reconfigure PFC no-drop priorities in an input policy or re-apply
the policy to an interface.
Related
Commands
dcb-policy input stack-unit stack-ports all
Apply the specified DCB input policy on all ports of the switch stack or a single stacked switch.
Syntax
dcb-policy input stack-unit {all | stack-unit-id} stack-ports all dcb-input-policy-name
To remove all DCB input policies applied to the stacked ports and rest the PFC to its default settings,
use the
no dcb-policy input stack-unit all command.
To remove only the DCB input policies applied to the specified switch, use the
no dcb-policy input
stack-unit
command.
Parameters
Defaults
None
Command Modes
CONFIGURATION
Version 8.3.12.0 Introduced on the S4810.
Version 8.3.16.0 Introduced on MXL 10/40GbE Switch IO Module
dcb-input Create a DCB input policy.
stack-unit-id
Enter the stack unit identification.
dcb-input-policy-name
Enter the policy name for the DCB input policy.