[nsp] Graphing packet loss

[Lucas Iglesias]

To properly graph packet loss over a link, you would need to send packets
(ICMP) secuencially over the link and check they return.
The packet loss clould happen for 4 reasons (in the roundtrip): local output
drops, remote input errors, remote output drops and local input errors.
The only monitoring system that I know for sure it does that is the JFFNMS
(http://jffnms.sourceforge.net/) ,but I think there has to be others.

regards,
Luckas.

-----Mensaje original-----
De: Roldan, Brad [mailto:BRoldan at covad.com]
Enviado el: Viernes, 21 de Noviembre de 2003 09:00 p.m.
Para: cisco-nsp at puck.nether.net
Asunto: RE: [nsp] Graphing packet loss




   I would suggest also including the "ignored" counters in your
calculation. These provide you with a generally good indication of
packets getting lost on your VIPs due to congestion. The MIB object is
'LocIfIgnored' for most Cisco platforms, or 'CieIfInIgnored' for newer
IOS releases.

Brad

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Hank Nussbacher
Sent: Friday, November 21, 2003 1:34 AM
To: cisco-nsp at puck.nether.net
Subject: [nsp] Graphing packet loss


We would like to graph the percentage pkt loss per line via MRTG polling
of Cisco routers (7200s and 7500s).  I would think that
(ifOutDisards+ifOutErrors)/ifOutUcastPkts
(ifInDiscards+ifInErrors)/ifInUcastpkts
should give the needed result.  But others are not sure.  We run
policy-map shaping on some of the lines and some of the class maps rate
limit p2p things like Kazaa and Gnutella.  That would cause an
OutDiscard
probably.  So perhaps adding in Discards is not wise?  But if an FE is
rate limited to 45Mb/sec and the shaping is causing discards, those I
would want to see.

And what could cause an iFInDiscard?

Or is there some better algorithm (specific MIBs plz) people use for
calculating pkt loss?

Thanks,
-Hank

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