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User Guide
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IP Address
Displays the user binding's IP address.
MAC Address
Displays user binding's MAC address.
VLAN
Displays user binding's VLAN ID.
Port
Displays user binding's port number.
Remaining
Lease Time
Displays user binding's remaining lease time.
Delete
Click it to delete the user binding.
4.7 QoS
4.7.1 QoS Configuration
QoS Overview
Quality of service is the ability to provide different applications, users, or data flows with different priority,
or to guarantee a certain level of performance to a data flow. For example, a required bit rate, delay, jitter,
packet dropping probability and/or bit error rate may be guaranteed. Quality of service guarantees are
important if the network capacity is insufficient, especially for real-time streaming multimedia applications
such as voice over IP, online games and IP-TV, since these often require fixed bit rate and are delay
sensitive, and in networks where the capacity is a limited resource, for example in cellular data
communication.
QoS addresses network latency and congestion issues. Non-critical (elastic) applications like web
browsing or emailing do not rely on QoS as they function however much or little bandwidth is available.
However, for critical (inelastic) services or applications that require a certain minimum level of bandwidth
and a certain maximum latency to function, QoS is indispensable. QoS can prevent critical traffic flow
from being discarded or delayed on a congested and overloaded network, thus ensuring a mix of
real-time/interoperative and non-real-time/non-interoperative traffic without meltdown.
Widely used priority types
1 Port Priority
The port priority is based on switch's physical ports. To config it, click QoS Configuration -> Port
Priority. Note that available values range from 0 to 7. It is used to determine the forwarding sequence of
packets not carrying priority identifiers.
2 802.1P Priority
The 802.1P priority, contained in the Ethernet header, is used by QoS disciplines to differentiate traffic on
layer 2 where analyzing IP header is not necessary. 802.1P priority is available only in an IEEE 802.1Q
tagged frame. As seen below, the 4-byte 802.1Q tag contains a 2-byte TPIDTag Protocol Identifier,
value: 0x8100and a 2-byte TCITag Control Information).
802.1Qtagged Ethernet frame
Below displays a detailed view of an 802.1Q tag. 802.1P priority, also known as class of service (CoS), is
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