Configure Quality of Service
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NETGEAR 24-Port Gigabit Smart Managed Pro Switch with PoE+ and 2 SFP Ports Model GS724TPv2
6. For each DSCP value, select from the corresponding Queue menu which internal traffic
class must be mapped to the DSCP value.
The traffic class is the hardware queue for a port. Higher traffic class values indicate a
higher queue position. Before traffic in a lower queue is sent, it must wait for traffic in
higher queues to be sent.
The allowed Per Hop Behavior (PHBs) values, apart from other DSCP experimental
values, are as follows:
• Class Selector (CS) PHB. These values are based on IP precedence.
• Assured Forwarding (AF) PHB. These values define four main levels to sort and
manipulate some flows within the network.
• Expedited Forwarding (EF) PHB. These values are used to prioritize traffic for
real-time applications. In many situations, if the network exceeded traffic and you
need some bandwidth guaranteed for an application, the EF traffic must receive this
rate independently of the intensity of any other traffic attempting to transit the node.
7. Click the Apply button.
The updated configuration is sent to the switch. Configuration changes take effect
immediately.
Manage Differentiated Services
The QoS feature contains Differentiated Services (DiffServ) support that allows traffic to be
classified into streams and given certain QoS treatment in accordance with defined per-hop
behaviors.
Standard IP-based networks are designed to provide best effort data delivery service. Best
effort service implies that the network delivers the data in a timely fashion, although there is
no guarantee. During times of congestion, packets might be delayed, sent sporadically, or
dropped. For typical Internet applications, such as email and file transfer, a slight degradation
in service is acceptable and in many cases unnoticeable. Conversely, any degradation of
service can negatively affect applications with strict timing requirements, such as voice or
multimedia.
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