Owner`s manual

Data Center Bridging (DCB) | 51
FTOS 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, Converged enhanced ethernet
(CEE) and CIN versions of PFC 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 (dcb
enable
) and disabled (no dcb enable) as the global DCB operation.
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.
If you apply an input policy with PFC disabled (
no pfc mode on):
4 Enable the PFC configuration on the port so that the
priorities are included in DCBx negotiation with peer
PFC devices.
The default is PCFC mode is on.
pfc mode on
DCB INPUT
POLICY
5 (Optional) Enter a text description of the input policy.
The maximum is 32 characters.
description
text
DCB INPUT
POLICY
6 Exit DCB input policy configuration mode.
exit
DCB INPUT
POLICY
7 Enter interface configuration mode.
interface type
slot/port
CONFIGURATION
8 Apply the input policy with the PFC configuration to an
ingress interface.
dcb-policy
input
policy-name
INTERFACE
9 Repeat Steps 1 to 8 on all PFC-enabled peer interfaces to ensure loss less traffic service.
Step Task
Command
Syntax Command Mode