Owners Manual

4. Enable the PFC configuration on the port so that the priorities are included in DCBx negotiation with
peer PFC devices.
DCB INPUT POLICY mode
pfc mode on
The default is PFC mode is on.
5. (Optional) Enter a text description of the input policy.
DCB INPUT POLICY mode
description text
The maximum is 32 characters.
6. Exit DCB input policy configuration mode.
DCB INPUT POLICY mode
exit
7. Enter interface configuration mode.
CONFIGURATION mode
interface type slot/port
8. Apply the input policy with the PFC configuration to an ingress interface.
INTERFACE mode
dcb-policy input policy-name
9. Repeat Steps 1 to 8 on all PFC-enabled peer interfaces to ensure lossless traffic service.
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.
By applying a DCB input policy with PFC enabled, you enable PFC operation on ingress port traffic. To
achieve complete lossless handling of traffic, also enable PFC on all DCB egress ports or configure the
dot1p priority-queue assignment of PFC priorities to lossless queues (refer to Configuring Lossless
Queues).
To remove a DCB input policy, including the PFC configuration it contains, use the no dcb-input
policy-name command in INTERFACE Configuration mode. To disable PFC operation on an interface,
use the
no pfc mode on command in DCB Input Policy Configuration mode. PFC is enabled and
disabled as the global DCB operation is enabled (dcb enable) or disabled (no dcb enable).
You can enable any number of 802.1p priorities for PFC. Queues to which PFC priority traffic is mapped
are lossless by default. Traffic may be interrupted due to an interface flap (going down and coming up)
when you reconfigure the lossless queues for no-drop priorities in a PFC input policy and reapply the
policy to an interface.
To apply PFC, a PFC peer must support the configured priority traffic (as detected by DCBx).
To honor a PFC pause frame multiplied by the number of PFC-enabled ingress ports, the minimum link
delay must be greater than the round-trip transmission time the peer requires.
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Data Center Bridging (DCB)