Configuring Ets In A Dcb Map - Dell S4048–ON Configuration Manual

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

A 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 interface.
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.
• Bandwidth assignment: By default, equal bandwidth is assigned to each dot1p priority in a priority group. To configure the bandwidth
assigned to the port queues associated with dot1p priorities in a priority group, use the bandwidth percentage parameter. The sum of
the bandwidth allocated to all priority groups in a DCB map must be 100% of the bandwidth on the link. You must allocate at least 1% of
the total bandwidth to each priority group.
• Scheduling of priority traffic: dot1p priority traffic on the switch is scheduled to the current queue mapping. dot1p priorities within the
same queue must have the same traffic properties and scheduling method.
• ETS configuration error: If an error occurs in an ETS configuration, the configuration is ignored and the scheduler and bandwidth
allocation settings are reset to the ETS default value: 100% of available bandwidth is allocated to priority group 0 and the bandwidth is
equally assigned to each dot1p priority.
If an error occurs when a port receives a peer's ETS configuration, the port's configuration resets to the ETS configuration in the previously
configured DCB map. If no DCB map was previously applied, the port resets to the default ETS parameters.
Data Center Bridging (DCB) 269