[mrtg] General monitoring question

Rafael.Bivar at ubs.com Rafael.Bivar at ubs.com
Wed May 16 18:59:17 CEST 2007

Hi Scott,


Here are my thoughts for your questions:

1- You should try to collect SNMP information as close as possible to
your network core, to avoid network traffic and extra WAN bandwidth
utilization. That means: I'd go for a monitoring on your core router
(assuming they both have enough memory and CPU resources). The graph you
get should be the same on both sides of the link you're collecting info,
the differences is that input-A should be equal to output-B and output-A
should be equal to input-B.


2- No, you don't monitor interfaces status. Maybe even you can do this
with a true/false statement (as long as we have OID for interface
status), but you'd take at least 5 mins to discover it, and that's an
eternity when it comes to network availability. Believe me, you don't
want to discover the link is down by the complaint of users... Maybe,
for this, you'd like to meet Nagios. :-) it's kind of nice and freeware.


Best regards,


Rafael Bivar

Rio de Janeiro - Brazil



From: mrtg-bounces at lists.oetiker.ch
[mailto:mrtg-bounces at lists.oetiker.ch] On Behalf Of Scott Danton
Sent: quarta-feira, 16 de maio de 2007 12:45
To: mrtg at lists.oetiker.ch
Subject: [mrtg] General monitoring question


I am trying to get a bit of general information about traffic
monitoring.  Here is my setup.  I have a core router that has 6 t-1
connections to my remote sites.  Where will I get the most accurate
monitoring from the core looking at all interfaces or the remote side


Second I was testing one of my sites that is connected, but no one is on
it yet, and I send a large number of pings.  I then disconnected the T-1
and the only thing that I noticed monitoring the core router was the
traffic dropped.  I could not tell the interface was down.   Is there a
way to tell if the interface is up or down with this program?






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