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Figure 2. Enhanced Transmission Selection

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

Table 2. ETS Traffic Groupings

Traffic Groupings Description

Priority group A group of 802.1p priorities used for bandwidth

allocation and queue scheduling. All 802.1p priority

traffic in a group must have the same traffic

handling requirements for latency and frame loss.

Group ID A 4-bit identifier assigned to each priority group.

The range is from 0 to 7.

Group bandwidth Percentage of available bandwidth allocated to a

priority group.

Group transmission selection algorithm (TSA) Type of queue scheduling a priority group uses.

In the Dell Networking OS, ETS is implemented as follows:

• ETS supports groups of 802.1p priorities that have:

– PFC enabled or disabled

– No bandwidth limit or no ETS processing

• Bandwidth allocated by the ETS algorithm is made available after strict-priority groups are serviced. If

a priority group does not use its allocated bandwidth, the unused bandwidth is made available to

other priority groups so that the sum of the bandwidth use is 100%. If priority group bandwidth use

exceeds 100%, all configured priority group bandwidth is decremented based on the configured

percentage ratio until all priority group bandwidth use is 100%. If priority group bandwidth usage is

less than or equal to 100% and any default priority groups exist, a minimum of 1% bandwidth use is

assigned by decreasing 1% of bandwidth from the other priority groups until priority group bandwidth

use is 100%.

• For ETS traffic selection, an algorithm is applied to priority groups using:

– Strict priority shaping

Data Center Bridging (DCB)

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Dell PowerEdge FX2/FX2s Manual de usuario Pagina 32