Tyco 0-1591099-x - Manual (Page 29)

24 Port Stackable Managed Switch – User Guide Page 29
Priority Configuration
The Switch supports basic QoS operation with the ability to map the 0-7 priority levels in
IEEE802.1p to either the low or high priority egress queue buffers. In addition the relative
weighting of high to low packets egressing from the Switch can also be programmed. This
menu section is selected from the Switch Configuration menu screen.
Figure 28. Priority Configuration Screen
Modify the Egress Mapping
After the Priority Configuration menu has been selected, the priority screen is displayed and
this enables the control of the QoS egress mapping. To adjust the mapping, select <edit>
from the action line and the cursor moves to the first map level. Use the <spacebar> key to
toggle between <low> and <high> settings. The default mapping is Levels 0-3 are Low
priority and Levels 4-7 are High priority.
Modify the Egress Weighting
The Switch can be programmed to control the relative flow of high and low priority packets
from the egress port. Note that this weighting algorithm is applied to the whole Switch and not
specific ports. To adjust the weighting algorithm, select <edit> from the action line and the
cursor moves to the first map level. Use the <tab> key to move through the mapping options
to the QoS Mode field. Then select the required algorithm using the <spacebar>. The
weighting options are:
All High Before Low – All high priority packets are sent before low priority (default)
Weight Round Ratio x:1 – The Switch will send x high priority packets followed by a low
priority packet (x can be between 2 to 7)
First Come First Serve – The first packet to arrive is sent out first (no actual priority is
applied).
Use the <esc> key to return to the action line and ensure that the settings are saved by
selecting the <apply> field.
Product Number 0-1591099-x © Tyco Electronics 2005 Issue 1