Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 236)

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Enabling Data Center Bridging

DCB is automatically configured when you configure FCoE or iSCSI optimization.

Data center bridging supports converged enhanced Ethernet (CEE) in a data center network. DCB is

disabled by default. It must be enabled to support CEE.

• Priority-based flow control

• Enhanced transmission selection

• Data center bridging exchange protocol

• FCoE initialization protocol (FIP) snooping

DCB processes virtual local area network (VLAN)-tagged packets and dot1p priority values. Untagged

packets are treated with a dot1p priority of 0.

For DCB to operate effectively, you can classify ingress traffic according to its dot1p priority so that it

maps to different data queues. The dot1p-queue assignments used are shown in the following table.

To enable DCB, enable either the iSCSI optimization configuration or the FCoE configuration.

To enable DCB with PFC buffers on a switch, enter the following commands, save the configuration, and

reboot the system to allow the changes to take effect.

1. Enable DCB.

CONFIGURATION mode

dcb enable

2. Set PFC buffering on the DCB stack unit.

CONFIGURATION mode

dcb stack-unit all pfc-buffering pfc-ports 64 pfc-queues 2

NOTE: To save the pfc buffering configuration changes, save the configuration and reboot the

system.

NOTE: Dell Networking OS Behavior: DCB is not supported if you enable link-level flow control on

one or more interfaces. For more information, refer to Ethernet Pause Frames.

QoS dot1p Traffic Classification and Queue Assignment

The following section describes QoS dot1P traffic classification and assignments.

DCB supports PFC, ETS, and DCBx to handle converged Ethernet traffic that is assigned to an egress

queue according to the following QoS methods:

Honor dot1p You can honor dot1p priorities in ingress traffic at the port or global switch level

(refer to Default dot1p to Queue Mapping) using the service-class dynamic

dot1p command in INTERFACE configuration mode.

Layer 2 class

maps

You can use dot1p priorities to classify traffic in a class map and apply a service

policy to an ingress port to map traffic to egress queues.

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Data Center Bridging (DCB)

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