306 | Data Center Bridging (DCB)
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Figure 13-3. DCB PFC and ETS Traffic Handling
Enabling Data Center Bridging
Data center bridging (DCB) is automatically configured when FCoE or iSCSI Optimization are
configured. 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 Table 13-1.
To enable DCB, you must enable either the iSCSI Optimization configuration or the FCoE configuration.
For information to configure iSCSI Optimization, refer to Enabling and Disabling iSCSI Optimization. For
information to configure FCoE, refer to Step 1 in Configuring FIP Snooping.
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:
Task Command Command Mode
Enable DCB.
dcb enable
CONFIGURATION
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