Cos - D-Link DCS-7110 User Manual

Configuration
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.
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.
D-Link DCS-7110 User Manual

Cos

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