[rrd-users] Re: mrtg please help

[Shipley, Rob]

You may get better advice on the cricket users or mrtg list. However, here
is something that you can check. MRTG probably has MaxBytes set for your
targets. It will put a NaN value if it is exceeded. This may show up as
drops in your graph. Check the log files to verify. If so, you can set a
AbsMax or set the MaxBytes higher. Or set an if-speed in cricket equal to
the MaxBytes in MRTG. This may resolve the discrepancies. Check cricket
documentation for details on setting up something like MaxBytes in MRTG.

--------------sample in Defaults file for cricket--------------------
graph   --default-- 
    y-max = %if-speed% 
    rrd-graph-args = "HRULE:%if-speed%#FF0000:Bandwidth(100%)" 
--------------sample in config file for cricket--------------------
	target-type	=	sub-interface
	if-speed =		1572864
	fmt-speed = 	"1.544 Mbits/sec"

-----Original Message-----
From: Tavaris Thomas [mailto:thomas at popmail.firn.edu]
Sent: Wednesday, December 18, 2002 8:27 AM
To: RRD List (E-mail)
Subject: [rrd-users] mrtg please help



I sent this out 2 days ago and no one responded. If I am being too vague in
my email then please let me know and I will provide as much info as I can.

Hi everyone,

I am using cricket and mrtg (running on separate boxes but on the same
segment) to poll various routers. Cricket is using rrdtool but mrtg is not.
My question is that recently one of the routers I poll is showing drops in
bandwidth on mrtg but not on cricket. When I log onto the router itself and
check, it shows no drops in traffic either. There is something wrong with
MRTG but I can't for the life of figure out what it could be. I have checked
log files and error messages but they are not coming up with anything.

I also checked the routers_name.log file in the httpd/mrtg dir and it
clearly shows a drop in avg incoming traffic for a couple of 5 minute
intervals (so I assume that mrtg is working correctly) but I am stumped.
Have I overlooked anything?? Can anyone provide me with any insight?

-Thanks and Regards

Tavaris Thomas - Internetworking Support Group (FIRN)
Department of Education/ Florida Information Resource Network
325 W. Gaines Street, B1-14 Florida Education Center
Tallahassee, FL 32399-0400  www.firn.edu
Phone: 850-487-8672 FAX: 850-922-1359



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