what do these outputs mean QOS

[carl_townshend]

How are the below measured, what do the values mean, I thought they would be a percentage out of 100, but the numbers seem odd to me, please can someone tell me why the numbers are used and what they mean and are measured in ?

Queueset: 1
Queue     :       1       2       3       4
----------------------------------------------
buffers   :      10      10      26      54
threshold1:     138     138      36      20
threshold2:     138     138      77      50
reserved  :      92      92     100      67
maximum   :     138     400     318     400
Queueset: 2
Queue     :       1       2       3       4
----------------------------------------------
buffers   :      16       6      17      61
threshold1:     149     118      41      42
threshold2:     149     118      68      72
reserved  :     100     100     100     100
maximum   :     149     235     272     242

[Shashank Singh · Accepted solution]

Hi Carl,

Queue-sets are templates for the egress queues on 2960s and 3750s. By default all interfaces follow queue set 1 but we can make them follow queue set 2 if needed.

All the values in both the queue sets are configurable.

Numbers against buffers are percentage of the total buffer on the egress of the interface for respective queue. Sum of these values has to be 100.

threshold1 and threshold2 are two WTD thresholds expressed as a percentage of the queue's allocated memory. The range is 1 to 400 percent.

Weighted tail drop (WTD) is used to manage the queue lengths and to provide drop precedences for different traffic classifications.

reserved-threshold is the amount of memory to be guaranteed (reserved) for the queue and expressed as a percentage of the allocated memory. The range is 1 to 100 percent.

maximum-threshold

Enable a queue in the full condition to obtain more buffers than are reserved for it. This is the maximum memory the queue can have before the packets are dropped. The range is 1 to 400 percent. The default configuration sets 400 percent as the maximum memory that all queues can have before packets are dropped.

For more information visit

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_25_sea/command/reference/cli1.html#wp2144505

Hope this helps,

Shashank

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