Reference Guide

302 | Data Center Bridging (DCB)
www.dell.com | support.dell.com
Configuring Bandwidth Allocation for DCBx CIN
After you apply a DCB map to an interface, if the DCBx version used in your data center network is CIN,
you may need to configure a QoS output policy to overwrite the default CIN bandwidth allocation. This
default setting divides the bandwidth allocated to each port queue equally between the dot1p priority traffic
assigned to the queue. For more information, see Allocating bandwidth to queue in the Quality of Service
(QoS) chapter.
To create a QoS output policy that allocates different amounts of bandwidth to the different traffic types/
dot1p priorities assigned to a queue and apply the output policy to the interface, follow these steps.
Applying a DCB Map in a Switch Stack
You must apply the same DCB map with PFC and ETS configuration to all stacked ports in a switch stack.
You cannot apply different DCB maps to different stacked switches.
Entering the
no dcb-map stack-unit all command removes all PFC and ETS settings applied to stacked ports
from the DCB map and resets PFC and ETS to their default settings.
Step Task Command Command Mode
1 Create a QoS output policy.
Maximum: 32 alphanumeric characters.
qos-policy-output
output-policy-name
CONFIGURATION
2 Configure the percentage of bandwidth to be
allocated to the dot1p priority/queue traffic in
the associated L2 class map.
Default: None.
bandwidth-percentage
percentage
QoS OUTPUT POLICY
3 Repeat Step 2 to configure bandwidth
percentages for other priority queues on the
port.
bandwidth-percentage
percentage
QoS OUTPUT POLICY
4 Exit QoS Output Policy Configuration mode.
exit
QoS OUTPUT POLICY
5 Enter INTERFACE Configuration mode.
interface type slot/port
CONFIGURATION
6 Apply the QoS output policy with the
bandwidth percentage for specified priority
queues to an egress interface.
service-policy output
output-policy-name
INTERFACE
Task Command Command Mode
Apply the specified DCB map on all ports
of the switch stack.
dcb-map stack-unit all stack-ports all
dcb-map-name
CONFIGURATION