Users Guide

Strict-priority
groups:
If two priority groups have strict-priority scheduling, traffic assigned from the priority
group with the higher priority-queue number is scheduled first. However, when three
priority groups are used and two groups have strict-priority scheduling (such as groups
1 and 3 in the example), the strict priority group whose traffic is mapped to one queue
takes precedence over the strict priority group whose traffic is mapped to two queues.
Therefore, in this example, scheduling traffic to priority group 1 (mapped to one strict-priority queue) takes
precedence over scheduling traffic to priority group 3 (mapped to two strict-priority queues).
Using ETS to Manage Converged
Ethernet Traffic
To use ETS for managing converged Ethernet traffic, use the following command:
dcb-map stack-unit all dcb-map-name
Applying DCB Policies in a Switch Stack
You can apply DCB policies with PFC and ETS configurations to all stacked ports in a switch stack or on a
stacked switch.
To apply DCB policies in a switch stack, follow this step.
• Apply the specified DCB policy on all ports of the switch stack or a single stacked switch.
CONFIGURATION mode
dcb-map {stack-unit all | stack-ports all} dcb-map-name
Configure a DCBx Operation
DCB devices use data center bridging exchange protocol (DCBx) to exchange configuration information with
directly connected peers using the link layer discovery protocol (LLDP) protocol.
DCBx can detect the misconfiguration of a peer DCB device, and optionally, configure peer DCB devices with
DCB feature settings to ensure consistent operation in a data center network.
DCBx is a prerequisite for using DCB features, such as priority-based flow control (PFC) and enhanced traffic
selection (ETS), to exchange link-level configurations in a converged Ethernet environment. DCBx is also
deployed in topologies that support lossless operation for FCoE or iSCSI traffic. In these scenarios, all network
devices are DCBx-enabled (DCBx is enabled end-to-end). For more information about how these features are
implemented and used, refer to:
• Configure Enhanced Transmission Selection
DCBx supports the following versions: CIN, CEE, and IEEE2.5.
Data Center Bridging (DCB) 324