From: MADMAN (dave@interprise.com)
Date: Mon Nov 04 2002 - 14:26:11 GMT-3
You can have linecoding incorrect and thing will still work but not
well. For example if you have B8ZS/AMI mismatch. If all the data you
send contains enough 1's density things will work alright but if you
have a large number on zeros your clocking goes to hell and the circuit
will temporairly drop. So sending a bunch of large all zeros pings can
help.
Dave
Huy Luu wrote:
>
> Friends,So we have a test pattern for ping, but is it usefull if the line
> is down? How can you ping anything when you outgoing interface is
> down? If you can reach a few hops, ping will still die at the location
> where the circuit drop. How can these ping patterns we discussed help?
> >From my understanding, if clocking or linecoding or framing is incorrect,
> the interface will not come up, then what good is ping? I have a question
> on bert test pattern. Can anyone explain these test patterns available
> on IOS and their use? 0s All 0's test pattern
> 1-in-8 1 in 8 test pattern
> 1s All 1's test pattern
> 2^11 2^11-1 test pattern
> 2^15 2^15-1 O.151 test pattern
> 2^20-QRSS 2^20-1 QRSS O.151 test pattern
> alt-0-1 Alternating 0's and 1's test pattern
> user-defined User defined test pattern
> thankyou very much.
>
-- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367"You don't make the poor richer by making the rich poorer." --Winston Churchill
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