On Tue, 15 May 2001, Rizzo Damian wrote:
> We have reason to believe we are experiencing Dropped packets
> between us and our remote branch. What I need
> Is proof, so I can go to my manager and say, "here, look at this". He
> believes just because he looks at the router and does a "show frame pvc"
and
> the Dropped Pkts statistic is 0, that there are no packets being dropped.
> Logical Assumption, but I've been told that just isn't the case. Let me
> throw this out to the group....Forget about the FECN's, BECN's and the DE
> pkts...If you were to telnet to both routers and look at the statistics of
> the point-to-point DLCI and compare the Output pkts on one end to the Input
> pkts on the other end, and if you see a discrepancy of 500,000....correct
me
> if I'm wrong here, but wouldn't that symbolize Dropped packets???
Thanks!
Strictly speaking, it doesn't. It implies that there are packets sent
out one router that don't make it to the other, but packets may be
dropped before or after the stage that would increment the counter you
and your boss are looking at. For instance, they may be dropped within
the FR cloud itself, because of congestion or transmission errors, or on
the sending router after the frame exited the PVC-specific queue and
entered the common interface queue (assuming there's such a thing).
You may want to look at a few other statistics to help you figure what's
going on and where:
- show interface (CRC errors, other input errors, input/output drops)
- show frame pvc (in/out FECN/BECN/DE packets)
--
"Someone approached me and asked me to teach a javascript course. I was
about to decline, saying that my complete ignorance of the subject made
me unsuitable, then I thought again, that maybe it doesn't, as driving
people away from it is a desirable outcome." --Me
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=4548&t=4529
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