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D-Link DCS-7110 User Manual
Configuration
Cos
Please follow the steps below to enable CoS settings:
1. Check the
Enable CoS
box.
2. Enter the VLAN ID of your switch (0~4095)
3. Choose the priority for each application (0~7).
4. Click
Save
.
Note:
• A VLAN Switch (802.1p) is required. The web browsing may fail if the CoS setting is
incorrect.
• Class of Service technologies do not guarantee a level of service in terms of bandwidth
and delivery time. They only offer a "best-effort." Users can think of CoS as "coarsely-
grained" traffic control and QoS as "finely-grained" traffic control.
• Though CoS is simple to manage, it lacks scalability and does not offer end-to-end
guarantees since it is based on L2 protocol.
IEEE802.1p defines a QoS model at OSI Layer 2 (Data Link Layer), which is called CoS (Class of Service). It adds a 3-bit value to the VLAN MAC header,
which indicates prioritization from 0~7 (Eight different classes of service are available). The priority is set up on the network switches, which then
use different queuing disciplines to forward the packets.
