Administrator 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 Conguration
• Conguring Priority-Based Flow Control
• Conguring PFC in a DCB Map
• Applying a DCB Map on a Port
• Conguring PFC without a DCB Map
• Priority-Based Flow Control Using Dynamic Buer Method
• Behavior of Tagged Packets
• Conguration Example for DSCP and PFC Priorities
• Using PFC to Manage Converged Ethernet Trac
• Congure Enhanced Transmission Selection
• Hierarchical Scheduling in ETS Output Policies
• Using ETS to Manage Converged Ethernet Trac
• Applying DCB Policies in a Switch Stack
• Congure a DCBx Operation
• Verifying the DCB Conguration
• QoS dot1p Trac Classication and Queue Assignment
• Conguring the Dynamic Buer Method
• Sample DCB Conguration
Ethernet Enhancements in Data Center Bridging
The following section describes DCB.
The S4048–ON system supports loading two DCB_Cong les: FCoE_DCB_Cong and iSCSI_DCB_Cong.
These les are located in the root directory ash:/CONFIG_TEMPLATE. After copying the conguration les to the startup cong and
reloading the system.
The device supports the following DCB features:
• Data center bridging exchange protocol (DCBx)
• Priority-based ow control (PFC)
• Enhanced transmission selection (ETS)
To congure PFC, ETS, and DCBx for DCB, refer to Sample DCB Conguration for the CLI congurations.
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252 Data Center Bridging (DCB)