D-Link DGS-6600-48TS Configuration Guide - Page 383

Volume 6-QOS / Chapter 36-Quality of Service (QoS) Chapter Overview Chapter 36 Quality of Service (QoS) Chapter Overview The following topics are included in this chapter, please go to the topic for more detailed information: • Chapter Overview • An Introduction to QoS • Policing and Color Markers • QoS Configuration Commands • Defining the Queuing Criteria • Setting the Default Class of Service Value on an Interface • Setting the Bandwidth Limit at Port Level • Creating DSCP Mutation Map • Attaching DSCP Mutation Map to an Interface • Scheduling • Defining the Policing • Specifying a Policing Rule • Creating a Class-Map to Classify Traffic • Configuring Policing • Configuring Single-rate Policing • Changing Single-rate Policing to Two-rate Policing • Configuring Aggregate Policing • Specifying a Marking Rule • Attach a Policy Map to an Interface • Configuration Examples • Configuring QoS Examples • QOS Strict Mode Configuration Example • QOS WRR Mode Configuration Example An Introduction to QoS In a network without Quality of Service (QoS) support, all packets have the same priority. Generally in a network where all packets have the same priority, the network will deliver the packet on a besteffort basis. When congestion on the network occurs, all packets have a chance of being dropped causing packet loss. In a network it is not unusual for different service requirements to be requested for different users. For example, voice traffic requires non-delay delivery. User traffic, such as e-mail, needs to be delivered without being dropped but in most circumstances it is not as time-critical as voice traffic. Some user traffic needs guaranteed service and some does not as guarantee service is more expensive than non-guarantee service. DGS-6600 Configuration Guide 383