Dell PowerConnect 5548 User Guide - Page 24

are 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 IP Precedence IP Header bit-field. Advanced QoS Frames that match an ACL and were permitted entrance are implicitly labeled with the name of the ACL that permitted their entrance. Advanced mode QoS actions defined in network policies can then be applied to these flows. The switch can set DSCP values and map IPv6 DSCP to egress queues in the same way it does for IPv4. The switch detects IPv6 frames by the IPv6 ethertype. For more information about Advanced QoS, see "QoS Advanced Mode" on page 668. TCP Congestion Avoidance The TCP Congestion Avoidance feature activates an algorithm that breaks up or prevents TCP global synchronization on a congested node, where the congestion is due to multiple sources sending packets with the same byte count. For more information, see "The following is an example of the CLI commands:" on page 656. Device Management Features SNMP Alarms and Trap Logs The system logs events with severity codes and timestamps. Events are sent as SNMP traps to a Trap Recipient List. For more information, see "SNMP" on page 307. 24 Dell PowerConnect 55xx Systems User Guide