NETGEAR AV Line M4250 GSM4210PX 8-Port Gigabit PoE+ Compliant Managed AV Switch with SFP (220W) - Manual (Page 771)

The IP ACL in this example matches all packets with the source IP address and subnet
mask of the Finance department's network and deny it on interfaces 2, 3, and 4 of the
switch. The second rule permits all non-Finance traffic on the ports. The second rule is
required because an explicit
deny all rule exists as the lowest priority rule.
Differentiated Services (DiffServ)
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 that it does. 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.
However, any degradation of service can negatively affect applications with strict timing
requirements, such as voice or multimedia.
Quality of Service (QoS) can provide consistent, predictable data delivery by
distinguishing between packets with strict timing requirements from those that are more
tolerant of delay. Packets with strict timing requirements are given special treatment in
a QoS-capable network. With this in mind, all elements of the network must be QoS
capable. If one node cannot meet the necessary timing requirements, this creates a
deficiency in the network path and the performance of the entire packet flow is
compromised.
There are two basic types of QoS:
• Integrated Services: Network resources are apportioned based on request and are
reserved (resource reservation) according to network management policy (RSVP,
for example).
• Differentiated Services: Network resources are apportioned based on traffic
classification and priority, giving preferential treatment to data with strict timing
requirements.
The switch supports DiffServ.
The DiffServ feature contains a number of conceptual QoS building blocks that you can
use to construct a differentiated service network. Use these same blocks in different
ways to build other types of QoS architectures.
You must configure three key QoS building blocks for DiffServ:
• Class
• Policy
• Service (the assignment of a policy to a directional interface)
Main User Manual 771 Configuration Examples
AV Line of Fully Managed Switches M4250 Series Main User Manual