LevelOne ProCon GSW-1290, User Manual

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LevelOne GSW-1290 Gigabit Layer2 SNMP Switch
GVRP
The Group VLAN Registration Protocol (GVRP) enables the port to
dynamically become a member of a VLAN. GVRP is disabled by default.
QoS
QoS settings allow customization of packet priority in order to facilitate delivery of data traffic that might
be affected by latency problems. The IEEE 802.1p Priority specification uses eight priority levels to
classify data packets. In 802.1p compliant devices, a tag inserted into the packet header is used to identify
the priority level of data packets.
The Switch implements 802.1p priority using four hardware queues instead of eight. Therefore the Switch
must have a means of mapping the eight levels specified in the IEEE 802.1p standard to the four hardware
queues used in the Switch. This is done using the Class of Service menu explained below. Further
customization of priority classification can be done with the Output Scheduling menu, also explained below.
Individual ports may still be assigned priority using the eight levels as defined by the 802.1p standard.
It is important to note that changes in a networks QoS scheme should be carefully considered, planned for
and if possible tested for efficiency. When set up properly, it QoS can allow efficient and timely delivery of
data for video conferencing or IP telephony without causing unacceptable delays of other network traffic. If
QoS is not well set up however, significant delays and excessive packet loss may result for data assigned to
lower priority queues.
802.1p Default Priority
The Switch allows the assignment of a default 802.1p priority to each port on the Switch.
Click on the
802.1p Default Priority link in the QoS sub-folder:
Figure 4- 26. Port Default Priority assignment menu
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