Dell PowerConnect 55xx Systems User Guide 25FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Maintenance Projects\DellContax\sources\CxUGFeatures.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 1 0 / 3 0 / 1 3 - F O R P R O O F O N LYare established or enforced. 802.1p is a spin-off of the 802.1Q (VLANs)standard. 802.1p establishes eight levels of priority, similar to the IPPrecedence IP Header bit-field.Advanced QoSFrames that match an ACL and were permitted entrance are implicitlylabeled with the name of the ACL that permitted their entrance. Advancedmode QoS actions defined in network policies can then be applied to theseflows.The switch can set DSCP values and map IPv6 DSCP to egress queues in thesame way it does for IPv4. The switch detects IPv6 frames by the IPv6 ether-type.For more information about Advanced QoS, see "QoS Advanced Mode" onpage 679.TCP Congestion AvoidanceThe TCP Congestion Avoidance feature activates an algorithm that breaks upor prevents TCP global synchronization on a congested node, where thecongestion is due to multiple sources sending packets with the same bytecount.For more information, see "The following is an example of the CLIcommands:" on page 667.Device Management FeaturesSNMP Alarms and Trap LogsThe system logs events with severity codes and timestamps. Events are sent asSNMP traps to a Trap Recipient List.For more information, see "SNMP" on page 314.
