mailing list archives
Re: Initial Route Server Stats for MAE-East
From: Mike Nasto <mnasto () franklin nysernet ORG>
Date: Sun, 22 Oct 1995 17:30:41 -0400 (EDT)
On Sun, 22 Oct 1995, Tim Bass wrote:
On Sat, 21 Oct 1995, Mike O'Dell wrote:
remember that using pings to sample connectivity to a very busy
cisco router is not a very reliable probe for several reasons.
Returning pings is a low-priority task in the first place, and
they are rate-limited, so if the processor is busy processing
lots of BGP updates and several folks are fribbling with it
using ping or SNMP, it is less than clear what they will see.
Michael A. Nasto quips:
OK! Agreed. So then, what would you use?
Have you ever been in a classroom and had a student raise his hand,
answer every question, ask intelligent questions, etc. just to prove
to the class how smart he or she is. This is the premise of
the 'Two Mike's Interchange' above. One says, HEY! I know ping packets
are a lower priority than everything else in a *CISCO* router
LOOK AT ME (wave wave). Then another kid in the class quips...
if PING is not what you would use, give us a better utility.
In fact... EVERYONE ( okay 99.73 percent :-) uses PING. After all
router LOAD is router LOAD.... and if a few ICMP packets can't get
back in a subjectly reasonable time.. then DUH.... "da network
is busy......" BGP updates take bandwidth just like any other packet.
Of course the 0.27 percent, zen routing gods of the universe just
feel the load and the harmonic BGP update patterns and PING between
the BGP updates.... for a better answer.
Sorry, I could not resist.... and apologize for the satire. PING!!
Yes, Tim. I always hated the "geeky" kid who always raised his hand or
had an answer for everything, too. But, I was serious with this
question. I thought it was rather obvious, too, that the router may be
busy so, what is the point? If you don't use 'ping' or 'traceroute',
what else do you use? I thought he had an answer. Obviously not.
Michael A. Nasto Customer Support Manager
NYSERNet, Inc. Phone: 315-453-2912 x 256
200 Elwood Davis Road Fax: 315-453-3052
Suite 103 Email: mnasto () franklin nysernet org
Liverpool, NY 13088-6147 mnasto () transit nyser net
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