16 Dell PowerConnect 28xx Systems User GuideClass of Service (CoS) FeaturesThe PowerConnect 28xx system enables users to define various services for traffic classes of service. Theunderlying mechanism for supporting bandwidth management and control is based on the use ofmultiple priority queues for classifying traffic. The switches support four queues per port.A CoS is defined by the user, whereby packets are related to the same Class of Service. After a packet hasbeen classified, it is assigned to one of the queues. The PowerConnect 28xx system can classify accordingto IPv4 information (DSCP).Class of Service 802.1p SupportThe IEEE 802.1p signaling technique is an OSI Layer 2 standard for marking and prioritizing networktraffic at the data link/MAC sub-layer. 802.1p traffic is classified and sent to the destination. Nobandwidth reservations or limits are established or enforced. 802.1p is a spin-off of the 802.1Q (VLANs)standard.Ethernet Switch Management FeaturesWeb-Based ManagementWith a Web-based management interface, the Ethernet Switches’ system can be managed from anyWeb browser. The system contains an Embedded Web Server (EWS), which serves HTML pages,through which the system can be monitored and configured.TFTP Trivial File Transfer ProtocolThe PowerConnect 28xx switches support software boot image and software download through TFTP.Remote MonitoringRemote Monitoring (RMON) is an extension to the Simple Network Management Protocol (SNMP),which provides network traffic statistics. RMON defines current and historical MAC-layer statistics andcontrol objects, allowing real-time information to be captured across the entire network. The switchessupport one RMON group for Ethernet statistics. The system provides a means to collect the statisticsdefined in RMON and to view the results, using the Web management interface in the system.
