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24 and 16 Port Smart Switch II – User Manual Page 17
It is important that only one method of QOS is enabled on the
switch at any one time. Enabling more than one method could
cause unpredictable prioritisation of traffic.
To enable TOS/Diff Serve priority then first highlight the TOS/Diff
Serve field and press the space bar. This will then show enabled.
To enable 802.1p priority highlight that field and press the space bar.
This will then show enabled.
To enable Port priority then first ensure that TOS/Diff Serv and
802.1p are disabled. Use the navigation keys to move to the cursor
to the Force Port to High Priority Setting section of the menu.
Navigate to the ports that are required to be high priority and press
the space bar. The high priority ports will display an x next to them.
The traffic arriving at these priority ports will be assigned a greater
priority than the traffic arriving at ports that have not been assigned
high priority.
The Priority Weighted Ration (High: Low) field is used to set the
precedence ratio between the high and low prioritised traffic.
There are 4 different ratios that can be allocated: -
1:0 -This will force the switch to process all high-prioritised traffic
before it starts to process traffic that has been prioritised as low.
4:1 -This will force the switch to give high priority traffic 4 times more
precedence to that of low priority packets. For every low priority
packet that is processed 4 high priority packets will be processed.
8:1 - This will force the switch to give high priority traffic 8 times
more precedence to that of low priority packets.
16:1 - This will force the switch to give high priority traffic 16 times
more precedence to that of low priority packets.
Product Number 0-1591093-x 0-1591047-x Issue 1
© Tyco Electronics 2005