Service Manual

3. Repeat Step 2 to configure bandwidth percentages for other priority queues on the port.
QoS OUTPUT POLICY mode
Dell(conf-qos-policy-out)#bandwidth-percentage 100
4. Exit QoS Output Policy Configuration mode.
QoS OUTPUT POLICY mode
Dell(conf-if-te-0/1)#exit
5. Enter INTERFACE Configuration mode.
CONFIGURATION mode
interface type slot/port
6. Apply the QoS output policy with the bandwidth percentage for specified priority queues to an
egress interface.
INTERFACE mode
Dell(conf-if-te-0/1)#service-policy output test12
Configuring ETS in a DCB Map
An S4048–ON switch supports the use of a DCB map in which you configure enhanced transmission
selection (ETS) setting. To configure ETS parameters, you must apply a DCB map on an S4048–ON
interface. This functionality is supported on the S4048–ON platform.
ETS Configuration Notes
ETS provides a way to optimize bandwidth allocation to outbound 802.1p classes of converged Ethernet
traffic. Different traffic types have different service needs. Using ETS, you can create groups within an
802.1p priority class to configure different treatment for traffics with different bandwidth, latency, and
best-effort needs.
When you configure ETS in a DCB map:
• The DCB map associates a priority group with a PFC operational mode (on or off) and an ETS
scheduling and bandwidth allocation. You can apply a DCB map on multiple egress ports.
• Use the ETS configuration associated with 802.1p priority traffic in a DCB map in DCBx negotiation
with ETS peers.
• Traffic in priority groups is assigned to strict-queue or weighted round-robin (WRR) scheduling in an
ETS configuration and is managed using the ETS bandwidth-assignment algorithm. Dell Networking
OS de-queues all frames of strict-priority traffic before servicing any other queues. A queue with
strict-priority traffic can starve other queues in the same port.
• ETS-assigned bandwidth allocation and strict-priority scheduling apply only to data queues, not to
control queues.
• Dell Networking OS supports hierarchical scheduling on an interface. The control traffic on Dell
Networking OS is redirected to control queues as higher priority traffic with strict priority scheduling.
After the control queues drain out, the remaining data traffic is scheduled to queues according to the
bandwidth and scheduler configuration in the DCB map. The available bandwidth calculated by the
ETS algorithm is equal to the link bandwidth after scheduling non-ETS higher-priority traffic.
• The configuration of bandwidth allocation and strict-queue scheduling is not supported at the same
time for a priority group.
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Data Center Bridging (DCB)