GSS Series User Manual
3.2.11 Quality of Service Two methods of Quality of Service is available in the GSS Series, they are 802.1p QoS – Is a
tag based QoS method normally used with 802.1q VLAN’s. Inside each Ethernet packet 3 bits
are reserved for QoS purposes, priority levels are then set based on the value of the 3 bit field
inside the packet. The GSS Series can then set High, Medium, Normal and Low priorities
based on the 3 bit value. The last QoS method is DSCP – This method utilises the TOS filed
inside the header of an Ethernet packet. Again priorities can be set based on the value of the
TOS filed bits.
3.2.11.1 Quality of Service – 802.1p
Fig. 3.21
QoS Mode: Used to set the required QoS method. Options are 802.1p and DSCP.
Prioritise Traffic: Used to set the priority of each 3 bit value. Priority values range from 0
through to 7. A high, Medium, Normal or Low class can be applied to
each 3 bit priority value.
802.1p Config: Used to set a particular class to each priority level. A High, Medium,
Normal or Low class can be assigned to each priority.
Apply Button: The Apply button must be pressed after making any changes to any of
the values on this screen.
Cancel Button: By pressing the cancel but ton, you will discard a ny changes that you
have made.
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