S350 Series 24-Port (PoE+) and 48-Port Gigabit Ethernet Smart Managed Pro Switches
Configure Quality of Service User Manual193
Internet applications, such as email and file transfers, 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 and multimedia.
Defining DiffServ
To use DiffServ for QoS, you must first define the following categories and their criteria:
1. Class. Create classes and define class criteria.
2. Policy. Create policies, associate classes with policies, and define policy statements.
3. Service. Add
a
policy to an inbound interface.
Packets are classified and processed based on defined criteria. The classification criteria are
defined by a class. The processing is defined by a policy’
s attributes. Policy attributes can be
defined on a per-class instance basis, and it is these attributes that are applied when a match
occurs. A policy can contain multiples classes. When the policy is active, the actions taken
depend on which class matches the packet.
Note the following about the DiffServ process:
• Packets are filtered and processed based on defined criteria. The filtering criteria is
defined by a class.
The processing is defined by a policy's attributes. Policy attributes can
be defined on a per-class instance basis, and it is these attributes that are applied when a
match occurs.
• The configuration process begins with defining one or more match criteria for a class.
Then one or more classes are added to a policy
. Policies are then added to interfaces.
• Packet processing begins by testing the match criteria for a packet. The All
class type
option specifies that each match criteria within a class must evaluate to true for a packet
to match that class. The Any class type option specifies that at least one match criteria
must evaluate to true for a packet to match that class. Classes are tested in the order in
which they were added to the policy. A policy is applied to a packet when a class match
within that policy is found.
Configure and Display Global DiffServ Settings
You can display DiffServ general status group information, which includes the current
administrative mode setting as well as the current and maximum number of rows in each of
the main DiffServ private MIB tables.
To configure the global DiffServ mode and display DiffServ general status group
information:
1. Connect your computer to the same network as the switch.
You can use a WiFi or wired connection to connect your computer to the network, or
connect directly to a switch that is off-network using an Ethernet cable.
2. Launch a web browser.
3. In the address field of your web browser, enter the IP address of the switch.
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