Users Guide

Data Center Bridging (DCB)

Data center bridging (DCB) refers to a set of enhancements to Ethernet local area networks used in data

center environments, particularly with clustering and storage area networks.

Topics:

• Ethernet Enhancements in Data Center Bridging

• Enabling Data Center Bridging

• Data Center Bridging: Default Configuration

• Configuring Priority-Based Flow Control

• Configuring PFC in a DCB Map

• Applying a DCB Map on a Port

• Configuring PFC without a DCB Map

• Priority-Based Flow Control Using Dynamic Buffer Method

• Behavior of Tagged Packets

• Configuration Example for DSCP and PFC Priorities

• SNMP Support for PFC and Buffer Statistics Tracking

• Performing PFC Using DSCP Bits Instead of 802.1p Bits

• PFC and ETS Configuration Examples

• Using PFC to Manage Converged Ethernet Traffic

• Operations on Untagged Packets

• Generation of PFC for a Priority for Untagged Packets

• Configure Enhanced Transmission Selection

• Hierarchical Scheduling in ETS Output Policies

• Using ETS to Manage Converged Ethernet Traffic

• Applying DCB Policies in a Switch Stack

• Configure a DCBx Operation

• Verifying the DCB Configuration

• QoS dot1p Traffic Classification and Queue Assignment

• Configuring the Dynamic Buffer Method

• Sample DCB Configuration

Ethernet Enhancements in Data Center

Bridging

The following section describes DCB.

The device supports the following DCB features:

Data Center Bridging (DCB) 254