Netgear GS752TS GS7xxTS-TPS Software Admin Manual - Page 178

GS728TS, GS728TPS, GS752TS, and GS752TPS Gigabit Smart Switches From the Class of Service link under the QoS tab, you can access the following pages: • Basic CoS Configuration on page 178 • CoS Interface Configuration on page 179 • Interface Queue Configuration on page 180 • 802.1p to Queue Mapping on page 182 • DSCP to Queue Mapping on page 183 Basic CoS Configuration Use the Trust Mode Configuration page to set the class of service trust mode of an interface. Each port in the switch can be configured to trust one of the packet fields (802.1p or IP DSCP), or to not trust any packet's priority designation (untrusted mode). If the port is set to a trusted mode, it uses a mapping table appropriate for the trusted field being used. This mapping table indicates the CoS queue to which the packet should be forwarded on the appropriate egress port(s). Of course, the trusted field must exist in the packet for the mapping table to be of any use, so there are default actions performed when this is not the case. These actions involve directing the packet to a specific CoS level configured for the ingress port as a whole, based on the existing port default priority as mapped to a traffic class by the current 802.1p mapping table. Alternatively, when a port is configured as untrusted, it does not trust any incoming packet priority designation and uses the port default priority value instead. All packets arriving at the ingress of an untrusted port are directed to a specific CoS queue on the appropriate egress port(s), in accordance with the configured default priority of the ingress port. This process is also used for cases where a trusted port mapping is unable to be honored, such as when a non-IP packet arrives at a port configured to trust the IP DSCP value. To display the Basic CoS Configuration page, click QoS > Basic > CoS Configuration. 178