[mrtg] Re: Varying Port Speed reported

[Brander, Eric]

Configmaker seems to be a "getting started" tool so you don't have to build
a cfg from scratch... so it seems to be limited as to what it will get and
how it gets it.  But in your case it really is working as intended, reading
the interface speed to get a max.  As to your question about changing a port
so that its at 100 when it was 10 before, any bytes/sec that are over the
maxbytes will get ignored, but any that are below will still get reported.
That will throw off the chart % and make it look like you are using more
than you really are.  There is no way to dynamically change your config file
every time your switchport speed changes though.. 

One thing you -could- do is to set the Bandwidth parameter on each port to
the maximum speed of the port.  Configmaker will read that Bandwidth
parameter instead of the other one (ifspeed I think).  If you do that
though, your % will be wrong on the links that are only at 10-meg.

BUT

You may as well edit your .cfg file manually instead... just search and
replace the parameter you want changed.  That will be much easier than
messing with your switch's config!  You'll just have to do that every time a
device changes the negotiated speed of a port.

-----Original Message-----
From: Alan Rader [mailto:arader at finishline.com]
Sent: Tuesday, July 30, 2002 2:54 PM
To: 'MRTG'
Subject: [mrtg] Varying Port Speed reported



I ran cfgmaker against our 6509, filled mostly with 48 port blades 10/100
ports.  I have noticed that it sets the Max speed to whatever might be
connected to that port.  So, ports that have printers in them are mostly
10/half here, the max speed will be 1250.0 kBytes/s which is 10Mb.  Ports
that are empty or are something with 100mb capable connections set maxspeed
as 12.5MBytes/s which I realize is 100Mb.

I am running 2.9.7.  What happens if I ever plug a Server into a port that a
printer used to be in, the max speed will be wrong.  Is there any easy
solution to this?

Thanks


Alan Rader
Finish Line, Inc.
Network Administrator
arader at finishline.com
317-899-1022 x3529


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