(Revised 2011-07-21) Page 58 of 158
Ports – QoS
The QOS decision tree chooses the highest priority Transmit Queue (TQ) of the following criteria:
1. Force High Priority (Port Based) TQ mapping,
2. IEEE802.1p TQ mapping, or
3. DSCP (RFC 2474) TQ mapping.
Each of these three methods is included or not based on the settings on this browser page.
When Force High Priority is enabled, the port based priority is included in the TQ decision for all ports and
all frames received on a port will use the default QOS priority for that port in the TQ decision. The default is
disabled. For example, if it is desired to have ingress frames on a port egress to the highest priority transmit
queue regardless of other factors, then enable Force High Priority and set the port's Default Port Priority
(see below) to 7.
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