Users Guide
ETS parameters ETS Conguration TLV and ETS Recommendation TLV.
Data Center Bridging in a Trac Flow
The following gure shows how DCB handles a trac ow on an interface.
Figure 30. DCB PFC and ETS Trac Handling
Enabling Data Center Bridging
DCB is automatically congured when you congure 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 ow 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 eectively, you can classify ingress trac according to its dot1p priority so that it maps to dierent data queues. The
dot1p-queue assignments used are shown in the following table.
To enable DCB, enable either the iSCSI optimization conguration or the FCoE conguration.
To enable DCB with PFC buers on a switch, enter the following commands, save the conguration, and reboot the system to allow the
changes to take eect.
1 Enable DCB.
CONFIGURATION mode
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Data Center Bridging (DCB)