Enhanced Transmission Selection - Dell C9000 Series Networking Configuration Manual

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Enhanced Transmission Selection

Enhanced transmission selection (ETS) supports optimized bandwidth allocation between traffic types in

multiprotocol (Ethernet, FCoE, SCSI) links. By default, ETS is disabled.

ETS allows you to divide traffic according to its 802.1p priority into different priority groups (traffic classes)

and configure bandwidth allocation and queue scheduling for each group to ensure that each traffic type is

correctly prioritized and receives its required bandwidth. For example, you can prioritize low-latency storage

or server cluster traffic in a traffic class to receive more bandwidth and restrict best-effort LAN traffic assigned

to a different traffic class.

The following figure shows how ETS allows you to allocate bandwidth when different traffic types are classed

according to 802.1p priority and mapped to priority groups.

Figure 29. Enhanced Transmission Selection

The following table lists the traffic groupings ETS uses to select multiprotocol traffic for transmission.

Table 14. ETS Traffic Groupings

Traffic Groupings

Group bandwidth

Group transmission selection algorithm (TSA)

In Dell Networking OS, ETS is implemented as follows:

ETS supports groups of 802.1p priorities that have:

A 4-bit identifier assigned to each priority group. The

range is from 0 to 7 configurable; 8 - 14 reservation

and 15.0 - 15.7 is strict priority group..

Percentage of available bandwidth allocated to a

priority group.

Type of queue scheduling a priority group uses.

Data Center Bridging (DCB)