[mrtg] Re: snmp utililzation

[Thijssen, Andries]

In addition, some devices allow you to set thresholds at which they fire of
an alert (in SNMP-lingo a trap), so you don't have to monitor devices at a
high rate.
But that is not something supported by MRTG.

Andries

-----Original Message-----
From: William Schwartz [mailto:wschwartz at apz-applied.com]
Sent: 14 June 2000 14:33
To: Mrtg at List.Ee.Ethz.Ch
Subject: [mrtg] Re: snmp utililzation


It really depends on how often you poll and how many ports you poll etc.
SNMP relies on UDP which is "quicker" then TCP (TCP requires a 3 way
handshake - causing more traffic; UDP is a "fire and forget" type of thing).

On the LAN this traffic should be negligible. On a low bandwidth WAN this
may be concerning if you are already using many other network management
products all sending and requesting SNMP info from the WAN. We've done some
things to minimize this traffic across the WAN. One a WAN with 450 remote
sites, we poll the head-end devices sub-interfaces going to each remote site
for performance data, that way we do not go across the wire to poll the
remote site. I don't bother polling the remote side of the link because the
numbers should be very close. This way I don't poll 450 remote routers for
performance data across the already low-bandwidth WAN.

Otherwise MRTG should not have a huge impact on most networks unless you are
polling a HUGE list of ports.

Hope it helps.
Will


-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]On
Behalf Of Claes Högberg
Sent: Wednesday, June 14, 2000 2:36 AM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] snmp utililzation


Hi,,
It seems like mrtg works quite fine and i get those graphs over my networks.
Probably it needs some modification.. and so on, you know how it is.. ;))

But my question are,, all those snmprequests and traffic that mrtg sends...
how much traffic does it really take ?

I check all my ports on my switches over both LAN and WANs for high
utilization, so when i check the crontab i start wondering...

Anyone that can give me a picture of this ?

//Claes Högberg
** SYSad **



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