Reference Guide

Data Center Bridging (DCB) | 323
• 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 automatically enabled 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 output
Apply the output policy with the ETS configuration to an egress interface.
Syntax
dcb-policy output policy-name
To delete the output policy, use the no dcb-policy output command.
Parameters
Defaults
none
Command Modes
INTERFACE
Command History
Usage Information
When you apply an ETS output policy to on interface, ETS-configured scheduling and bandwidth
allocation take precedence over any configured settings in QoS output policies.
To remove an ETS output policy from an interface, enter the no dcb-policy output policy-name
command. ETS is enabled by default with the default ETS configuration applied (all dot1p priorities in
the same group with equal bandwidth allocation).
Related
Commands
dcb-input Create a DCB input policy.
S6000
policy name
Enter the output policy name.
Version 9.0.2.0 Introduced on the S6000.
Version 8.3.16.1 Introduced on MXL 10/40GbE Switch IO Module
dcb-output Create a DCB output policy.