Dell PowerConnect 2708 User Manual

Also see for 2724 - PowerConnect Switch: Appendix Datasheet Getting started guide

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Dell PowerConnect 2708 User Manual Manual pdf 70 page image

70Packets arriving untagged are assigned a default VPT value, which is set on a per port basis. Theassigned VPT is used to map the packet to the egress queue.DSCP values can be mapped to priority queues. DSCP mapping is enabled on a per-system basis.The following table contains the default DSCP mapping to egress queue values:Table 7-2. DSCP Mapping to Egress Queue Default ValuesCoS ServicesAfter packets are assigned to a specific egress queue, CoS services can be assigned to the queue(s).Egress queues are configured with a scheduling scheme by one of the following methods:• Strict Priority — Strict Priority (SP) allows the prioritization of mission-critical and time-sensitive traffic over less time-sensitive applications. Thus, ensuring that time-sensitiveapplications are always forwarded before traffic with lower priority. For example, under StrictPriority, voice over IP traffic is forwarded before FTP or e-mail (SMTP) traffic.• Weighted Round Robin — Ensures that a single application does not dominate the Ethernetswitch forwarding capacity. Weighted Round Robin (WRR) forwards entire queues in aRound Robin order. All queues can participate in WRR.DSCP Value F orwarding Queue Values0-15 q1 (Lowest Priority)16-31 q232-47 q348-63 q4 (Highest Priority)