Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 281)

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Data Center Bridging: Default Configuration

This functionality is supported on the S6000 platform.

Before you configure PFC and ETS on an S6000 switch (see Configuring DCB Maps and its Attributes),

take into account the following default settings:

DCB is enabled.

The PFC memory buffer supports up to 52 (not 64) PFC-enabled ports and two lossless queues per port.

PFC and ETS are globally enabled by default.

The default dot1p priority-queue assignments are applied as follows:

Dell(conf)#do show qos dot1p-queue-mapping

Dot1p Priority : 0 1 2 3 4 5 6 7

Queue : 2 0 1 3 4 5 6 7

Dell(conf)#

NOTE: In Egress queue assignment (8 queues in S6000, 4 against in S5000 / S4810.

PFC is not applied on specific dot1p priorities.

ETS: Equal bandwidth is assigned to each port queue and each dot1p priority in a priority group.

To configure PFC and ETS parameters on an S6000 interface, you must specify the PFC mode, the ETS

bandwidth allocation for a priority group, and the 802.1p priority-to-priority group mapping in a DCB

map. No default PFC and ETS settings are applied to Ethernet interfaces.

Configuring PFC and ETS in a DCB Map

An S6000 switch supports the use of a DCB map in which you configure priority-based flow control

(PFC) and enhanced transmission selection (ETS) settings. To configure PFC and ETS parameters, you

must apply a DCB map on an S6000 interface. This functionality is supported on the

S6000 platform.

PFC Configuration Notes

PFC provides flow control based on the 802.1p priorities in a converged Ethernet traffic that is received

on an interface and is enabled by default when you enable DCB. As an enhancement to the existing

Ethernet pause functionality, PFC stops traffic transmission for specified priorities (CoS values) without

impacting other priority classes. Different traffic types are assigned to different priority classes.

When traffic congestion occurs, PFC sends a pause frame to a peer device with the CoS priority values of

the traffic that needs to be stopped. DCBx provides the link-level exchange of PFC parameters between

peer devices. PFC allows network administrators to create zero-loss links for SAN traffic that requires no-

drop service, while at the same time retaining packet-drop congestion management for LAN traffic.

On an S6000 switch, PFC is enabled by default on Ethernet ports (pfc mode on command). You can

configure PFC parameters using a DCB map or the

pfc priority command in Interface configuration

mode. For more information, see Configuring DCB Maps and its Attributes.

Data Center Bridging (DCB)

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