Netgear CSM4532 Software Administration Manual - Page 234
Un-trusted Port Default Priority, 4.1.3., Queue Configuration, 4.1.4., Traffic Class Groups
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9.4.1.2. Un-trusted Port Default Priority Alternatively, a port may be configured as un-trusted, whereby 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 precedence or IP DSCP value. 9.4.1.3. Queue Configuration Queue configuration involves setting the following hardware port egress queue configuration parameters: • Scheduler type: strict vs. weighted • Minimum guaranteed bandwidth • Maximum allowed bandwidth (i.e. shaping) • Queue management type: tail-drop vs. WRED • Tail drop parameters: threshold • WRED parameters: minimum threshold, maximum threshold, drop probability Defining these settings on a per-queue basis allows the user to create the desired service characteristics for different types of traffic. The tail drop and WRED parameters are specified individually for each supported drop precedence level. In addition, the following settings can be specified on a per-interface basis: • Queue management type: tail drop vs. WRED (only if per-queue configuration is not supported) • WRED decay exponent 9.4.1.4. Traffic Class Groups For platforms such as M4500 series switches that support the multistage scheduling architecture, the Traffic Class Groups (TCGs) extend the egress queuing to make use of multiple levels of scheduling. A TCG defines a collection of egress COS Queues. The configuration parameters for the TCG specify the class of service characteristics applied to the aggregated traffic from the associated COS queues. This involves setting the following configuration parameters to each TCG. • Map one or more COS queues to the TCG. • Set the scheduling type for each TCG: Strict vs. WDRR • Set the weight percentages for each TCG. NETGEAR M4500 Series Switches Software Administration Manual 234