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Configuring QoS
The Web interface provides the following QoS configuration functions:
• Configuring subnet limit
• Configuring advanced limit
• Configuring advanced queue
Overview
Quality of Service (QoS) is a concept concerning service demand and supply. It reflects the ability to
meet customer needs. Generally, QoS focuses on improving services under certain conditions rather
than grading services precisely.
In an Internet, QoS evaluates the ability of the network to forward packets of different services. You
can base the evaluation on different criteria because the network provides various services.
Generally, QoS refers to the ability to provide improved service by solving the core issues such as
delay, jitter, and packet loss ratio in the packet forwarding process.
Through the Web interface, you can configure the following QoS features:
• Subnet limit
• Advanced limit
• Advanced queue
Subnet limit
Subnet limit enables you to regulate the specification of traffic entering or leaving a device based on
source/destination IP address. Packets conforming to the specification can pass through, and
packets exceeding the specification are dropped. In this way, the network resources are protected.
Advanced limit
Similar to subnet limit, advanced limit also implements traffic policing at the IP layer. They differ in
that:
• Advanced limit can classify traffic based on time range, packet precedence, protocol type, and
port number, and provide more granular services.
• In addition to permitting traffic conforming to the specification to pass through, advanced limit
can also set IP precedence, differentiated service code point (DSCP) value, and 802.1p priority
for packets as required.
For more information about IP precedence, DSCP values, and 802.1p priority, see "Appendix Packet
pre
c
edences."
Advanced queue
Advanced queue offers the following functions:
• Interface bandwidth limit—Uses token buckets for traffic control and limits the rate of
transmitting packets (including critical packets) on an interface. When limiting the rate of all
packets on an interface, interface bandwidth limit is a better approach than subnet limit and
advanced limit. This is because working at the IP layer the latter two functions do not take effect
on packets not processed by the IP layer.
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