Tyco Electronics 0-15910 Series, Руководство пользователя

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8 Port SNMP Managed Switch – User Manual Page 29
Product Number 0-15910xx-x © Tyco Electronics 2004 PL0357 Issue A
QoS 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.
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 < Space > 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
High/Low Queue Service Ratio field. Then select the required algorithm using the < Space >
key. The weighting options are:-
Weighting Action
H->L All high priority packets are sent before any low priority packets (default)
FIFO The first packet to arrive is sent out first (no actual priority is applied)
1:1 One high priority packet is sent followed by a low priority packet (if available)
2:1 Two high priority packets are sent followed by one low priority packet (if available)
3:1 Three high priority packets are sent followed by one low priority packet (if available)
4:1 Four high priority packets are sent followed by one low priority packet (if available)
5:1 Five high priority packets are sent followed by one low priority packet (if available)
6:1 Six high priority packets are sent followed by one low priority packet (if available)
7:1 Seven high priority packets are sent followed by one low priority packet (if available)
Use the < Esc > key to return to the action line and ensure that the settings are saved by
selecting the < Save > field.