Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 282)

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As soon as you apply a DCB map with PFC enabled on an interface, DCBx starts exchanging information

with a peer. The IEEE802.1Qbb, 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 map with PFC enabled,

you enable PFC operations on ingress port traffic. To achieve complete lossless handling of traffic,

configure PFC priorities on all DCB egress ports.

NOTE: DCB maps are supported only on physical Ethernet interfaces.

• To remove a DCB map, including the PFC configuration it contains, use the no dcb map command

in Interface configuration mode.

• To disable PFC operation on an interface, use the no pfc mode on command in DCB-Map

configuration mode.

• Traffic may be interrupted when you reconfigure PFC no-drop priorities in a DCB map or re-apply the

DCB map to an interface.

• For PFC to be applied, the configured priority traffic must be supported by a PFC peer (as detected by

DCBx).

• If you apply a DCB map with PFC disabled (pfc off), you can enable link-level flow control on the

interface using the

flowcontrol rx on tx on command. To delete the DCB map, first disable

link-level flow control. PFC is then automatically enabled on the interface because an interface is

PFC-enabled by default.

• To ensure no-drop handling of lossless traffic, PFC allows you to configure lossless queues on a port

(see Configuring DCB Maps and its Attributes).

• When you configure a DCB map, an error message is displayed if the PFC dot1p priorities result in

more than two lossless queues.

• When you apply a DCB map, an error message is displayed if link-level flow control is already enabled

on an interface. You cannot enable PFC and link-level flow control at the same time on an interface.

• In a switch stack, configure all stacked ports with the same PFC configuration.

• Dell Networking OS allows you to change the default dot1p priority-queue assignments only if the

change satisfies the following requirements in DCB maps already applied to S6000 interfaces:

• All 802.1p priorities mapped to the same queue must be in the same priority group.

• A maximum of two PFC-enabled, lossless queues are supported on an interface.

Otherwise, the reconfiguration of a default dot1p-queue assignment is rejected.

• To ensure complete no-drop service, apply the same PFC parameters on all PFC-enabled peers.

PFC Prerequisites and Restrictions

On an S6000 switch, PFC is globally enabled by default, but not applied on specific 802.1p priorities. To

enable PFC on 802.1p priorities, create a DCB map. For more information, see Configuring DCB Maps

and its Attributes.

The following prerequisites and restrictions apply when you configure PFC in a DCB map:

• You can enable PFC on a maximum of two priority queues on an interface. Enabling PFC for dot1p

priorities configures the corresponding port queue as lossless.

• You cannot enable PFC and link-level flow control at the same time on an interface.

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