Dell PowerEdge FX2 Dell PowerEdge FN I/O Aggregator Configuration Guide 9.6(0 - Page 32
Traffic Groupings, Description, Enhanced Transmission Selection
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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 32 Data Center Bridging (DCB)