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PowerConnect B-Series TI24X Configuration Guide 417
53-1002269-02
Scheduling
15
Command syntax
To change the bandwidth percentages for the queues, enter commands such as the following.
Note that this example uses the default queue names.
Syntax: [no] qos profile <queue> <percentage> <queue> <percentage> <queue> <percentage>
<queue> <percentage> <queue> <percentage> <queue> <percentage> <queue>
<percentage> <queue> <percentage>
Each <queue> parameter specifies the name of a queue. You can specify the queues in any order
on the command line, but you must specify each queue.
The <percentage> parameter specifies a number for the percentage of the device outbound
bandwidth that is allocated to the queue. QoS queues require a minimum bandwidth percentage of
3% for each priority. When jumbo frames are enabled, the minimum bandwidth requirement is 8%.
If these minimum values are not met, QoS may not be accurate.
Configuration notes
• The total of the percentages you enter must equal 100.
• PowerConnect devices do not adjust the bandwidth percentages you enter.
PowerConnect B-Series TI24X devices supports seven priorities instead of eight when sFlow is
enabled. QoS queue 1 is reserved for sFlow and not used by other packets. Any non-sFlow packets
assigned to QoS queue 1 will be directed to QoS queue 0.
Changing the bandwidth allocations of the hybrid WRR and SP queues
To change the default bandwidth percentages for the queues when the device is configured to use
the combined SP and WRR queuing mechanism, enter commands such as the following. Note that
this example uses the default queue names.
PowerConnect(config)#qos profile qosp7 sp qosp6 sp qosp5 20 qosp4 16 qosp3 16
qosp2 16 qosp1 16 qosp0 16
Syntax: [no] qos profile <queue 7> sp <queue 6> sp | <percentage> <queue 5> <percentage>
<queue 4> <percentage> <queue 3> <percentage> <queue 2> <percentage> <queue
1> <percentage> <queue 0> <percentage>]
Each <queue x> parameter specifies the name of a queue. You can specify the queues in any
order on the command line, but you must specify each queue. Note that queue 7 supports strict
priority only, queue 6 supports both strict priority and WRR queuing mechanisms, and queues 0 –
5 support the WRR queuing mechanism only.
The sp parameter configures strict priority as the queuing mechanism. Note that only queue 7 and
queue 6 support this method.