You need to look into the following things in this particular scenario:
1. The output queue drops on the serial interface and if they increase
during the file transfer.
2. The queueing type configured on the interface such as WFQ, FIFO, etc.
3. The "buffers" situation in terms of their depletion.
4. The mix of applications that are being transported over the WAN link.
5. A Sniffer WAN trace may also prove helpful in this situation.
6. Observe the "5-minute traffic rate" on the serial interface during a
large file transfer and see if it peaks to 56 Kbps.
7. Is something driving the interface into "process-switched mode" ?
8. You can prioritize the application that is being impacted the most by
using any of the queueing mechanisms. However, this decision may have some
adverse effects if not properly researched.
Here I am assuming that the frame PVC has been provisioned correctly and
that it is delivering as per the rated CIR/EIR. This was just to trigger
your thought-process as you have not provided enough information to be able
to correctly pin-point the cause.
Aziz S. Islam
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Kane, Christopher A.
Sent: Tuesday, December 26, 2000 9:59 AM
To: '[EMAIL PROTECTED]'
Subject: interface stats, physical problem or high utilization?
I'm looking for some feedback to a discussion I had with a co-worker. I'm
not looking for troubleshooting assistance with this problem. Rather, I
would like to know if anyone else has experienced a similar situation in
which a utilization problem looks like a physical problem?
We had a customer with a 56k Frame ckt terminating into a Cisco 2524 with an
integrated 4-wire CSU/DSU. The end user was complaining of dropping when
trying to pull large files (3 meg).
The interface stats showed Input errors, CRCs and carrier transitions.
Myself and the telco were able to test end-to-end clean several times. We
then swapped the 2524 for fear that the integrated CSU/DSU was flaky. The
problem remained.
Then my co-worker made a statement that I am having a hard time agreeing
with. He stated that it must be heavy utilization by the end user that is
causing the problem. Could that be? A utilization problem that looks like a
physical problem according to the stats provided by the serial interface?
It's always fun to banter with co-workers. Round-table discussions in front
of the whiteboard are my favorite part of the job.
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