3Com 2816-SFP Plus (3C16485) User Manual
Also see for Baseline 2816: Product guideDatasheetDatasheetDatasheetDatasheet
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802.1p PrioritizationThe Switch has priority queuing enabled, which means allpackets that are received are examined to see if they have beenpriority encoded. If a packet has been priority encoded, then theSwitch will read the priority level and determine whether thepacket should be directed through the normal or high prioritychannel. This feature can be useful for example during excessiveloads when one type of traffic may require priority over another.The Switch is configured to comply with 802.1p, VLAN taggedframes.Traffic prioritization ensures that high priority data is forwardedthrough the Switch without being delayed by lower priority data.It differentiates traffic into classes and prioritizes those classesautomatically. Traffic prioritization uses the multiple traffic queuesthat are present in the hardware of the Switch to ensure thathigh priority traffic is forwarded on a different queue from lowerpriority traffic, and is given preference over that traffic. Thisensures that time-sensitive traffic gets the highest level of service.The 802.1D standard specifies eight distinct levels of priority (0 to7), each of which relates to a particular type of traffic. Thepriority levels and their traffic types are shown in the followingtable.The traffic prioritization feature supported by the Switch iscompatible with the relevant sections of the IEEE 802.1Dstandard (incorporating IEEE 802.1p).This switch uses the Weighted Round Robin (WRR) algorithm todetermine the frequency at which it services each priority queue.The Switch allows you to choose between using IP Precedence orDSCP (Differentiated Services Code Point) priority. When either ofthese services is enabled, the priorities are mapped to a Class ofService value by the Switch, and the traffic then sent to thecorresponding output queue.Priority Level Traffic Type0 Best Effort1 Background2 Standard (spare)3 Excellent Effort (business critical)Priority Level Traffic Type4 Controlled Load (streaming multimedia)5 Video (Interactive media), less than 100 millisecondsnlatency and jitter.6 Voice (Interactive voice), less than 10 millisecondslatency and jitter.7 Network Control Reserved traffic |
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