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Chapter 5: Using the Web-based Utility for Configuration
QoS Tab - DSCP Settings
24-Port 10/100/1000 Gigabit Switch with Webview and PoE
QoS Tab - DSCP Settings
The Switch supports a common method of prioritizing layer 3/4 traffic to meet application requirements. Traffic
priorities can be specified in the IP header of a frame using the priority bits in the Type of Service (ToS) octet. If
priority bits are used, the ToS octet may contain six bits for Differentiated Services Code Point (DSCP) service.
When these services are enabled, the priorities are mapped to a Class of Service value by the Switch and the
traffic then sent to the corresponding output queue. Because different priority information may be contained in
the traffic, the Switch maps priority values to the output queues in the following manner:
The precedence for priority mapping is DSCP Priority and then Default Port Priority.
To enable DSCP priority mapping, select
DSCP Priority Status
.
Priority Status
. Enables the DSCP priority mapping. (Enabled is the default setting.)
DSCP to CoS
. Maps Differentiated Services Code Point values to CoS values.
Click
Save Settings
to save the changes.
QoS Tab - Diffserv Settings
The commands described in this section are used to configure Quality of Service (QoS) classification criteria and
service policies. Differentiated Services (DiffServ) provides policy-based management mechanisms used for
prioritizing network resources to meet the requirements of specific traffic types on a per hop basis. Each packet
is classified upon entry into the network based on access lists, IP Precedence, DSCP values, or VLAN lists. Using
access lists allows you select traffic based on Layer 2, Layer 3, or Layer 4 information contained in each packet.
Based on configured network policies, different kinds of traffic can be marked for different kinds of forwarding.
All switches or routers that access the Internet rely on class information to provide the same forwarding
treatment to packets in the same class. Class information can be assigned by end hosts, or switches or routers
along the path. Priority can then be assigned based on a general policy, or a detailed examination of the packet.
However, note that detailed examination of packets should take place close to the network edge so that core
switches and routers are not overloaded.Switches and routers along the path can use class information to
prioritize the resources allocated to different traffic classes. The manner in which an individual device handles
traffic in the DiffServ architecture is called per-hop behavior. All devices along a path should be configured in a
consistent manner to construct a consistent end-to-end QoS solution.
Figure 5-38: QoS - Diffserv Settings
Figure 5-37: QoS - DSCP Settings
Summary of Contents for SRW2024P
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