Network Administration: Quality of Service 233FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Dell Astute\UserGuide\Dell_Astute_Network_Admin_QoS.fmD E L L C O N F I D E N T I A L – P R E L I M I N A R Y 8 / 9 / 1 6 - F O R P R O O F O N L Y– Enable Egress Shaping Rate — Enable/disable egress trafficlimitation. If this field is selected, enter the following fields.– Committed Information Rate (CIR) — Enter the average maximumamount of data allowed to be sent on the egress interface, measured inbits per second.– Committed Burst Size (CBS) — Enter the maximum burst of datathat is allowed to be sent on the egress interface, even though it isabove the CIR. This is defined in number of bytes of data.TCP Congestion AvoidanceUse the TCP Congestion Avoidance page to activate a congestion avoidancealgorithm. The algorithm breaks up or prevents TCP global synchronizationin a congested node, where the congestion manifests when multiple sourcesreduce transmission to the congested node due to packet dropping andincrease the transmission again at the same time.To configure TCP congestion avoidance:1 Click Network Administration > Quality of Service > Global Settings >TCP Congestion Avoidance.NOTE: TCP Congestion Avoidance increases network reliability, but it alsoincreases network traffic. Continue only if you are sure changing the setting willimprove the TCP congestion on the affected network segment. For this change to beeffective you must save the configuration and reboot the device.2 Click Edit and select either Enabled/Disabled to TCP CongestionAvoidance to enable/disable the algorithm.QoS MappingThis section contains the following topics:• Overview• DSCP Mapping• Class Mapping• Policers• Aggregate Policer• Policy Table
