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Interface statistics meaning

Premdeep Banga
Level 7
Level 7

Hi Everyone,

I have a simple question that I need supporting documation for.

On ASA's when we do 'show interface' for a gig interface, we can get any among two,

input queue (blocks free curr/low): hardware (255/230)

output queue (blocks free curr/low): hardware (255/0)

OR

input queue (curr/max packets): hardware (0/7)

output queue (curr/max packets): hardware (0/13)

cur/low I suppose when we have underruns and overruns going on.

What i want to know is the meaning of the output. In case of curr/max its very clear.

input queue (curr/max packets): hardware (0/7)

output queue (curr/max packets): hardware (0/13)

Above means (correct me if I am incorrect), there are Zero packets currently in input queue, and 7 were the max packets seen at one time. For output queue, zero are the current packets in ouput queue and 13 were max that were seen in output queue. This is documented.

But I could not find an explaination for,

input queue (blocks free curr/low): hardware (255/230)

output queue (blocks free curr/low): hardware (255/0)

How should I interpret it? I need supporting documentaion please.

Regards,

Prem

4 Replies 4

Kureli Sankar
Cisco Employee
Cisco Employee

Prem,

Pls. refer the command reference link for "sh int" here:

-Kureli

Kureli,

Please refer to my question. I have already gone through the link that you have mentioned in the post above. The link only provides meaning for,

Input queue (curr/max packets)

Output queue (curr/max packets)

I could not find a link/reference that could provide me with meaning for,

input queue (blocks free curr/low)

output queue (blocks free curr/low)

Regards,

Prem

Sorry. Meant to enclose this link:

(10-Gigabit Ethernet only). Shows the queue statistics.

For example, the following lines:

          RX[00]: 2866177 packets, 189167682 bytes

                  curr/min blocks: 511/408

indicate that on receive queue 0, 2866177 packets and 189167682 bytes  were received. Currently there are 511 blocks in hardware queue 0, and  the minimum blocks were 408.

Similarly for transmit, the following lines:

         TX[00]: 2820355 packets, 186143390 bytes, 0 underruns

                  curr/max blocks: 43/250

indicate that on transmit queue 0, 2820355 packets and 186143390 bytes  were sent. There have been 0 underruns. Currently there are 43 blocks on  transmit queue 0 and the maximum blocks were 250.

The "packets input" and "bytes" displayed prior to "Queue stats" is the sum of packets and bytes on all RX queues respectively.

Similarly, the "packets output" and "bytes" is the sum of packets and bytes on all TX queues.

-Kureli

Thanks Kureli,

Still you are missing my main point. I want interpretation for,

input queue (blocks free curr/low)

output queue (blocks free curr/low)

"blocks free curr/low" <------

Not,

"curr/max packets".

Also for,

curr/min blocks: 511/408

When you say Currently there are 511 blocks in hardware queue 0, and  the minimum blocks were 408. This means 511 blocks free? or currently engageged? and 'minimum blocks were 408' means at peak utilization there were 408 free? or used? Does this statistics how high water mark blocks or they are just random?

Regards

Prem

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