[rrd-users] Re: Problems monitoring Gigabit Links

[Logg, Connie A.]

How often are you polling?  Does it support 64 bit counters or only 32 bit?

Are you using the rfc 2233 

>From rfc 2233

3.1.6.  Counter Size

   As the speed of network media increase, the minimum time in which
   a 32 bit counter will wrap decreases.  For example, a 10Mbs stream
   of back-to-back, full-size packets causes ifInOctets to wrap in
   just over 57 minutes; at 100Mbs, the minimum wrap time is 5.7
   minutes, and at 1Gbs, the minimum is 34 seconds.  Requiring that
   interfaces be polled frequently enough not to miss a counter wrap
   is increasingly problematic.

..As an aside, a 1-terabit/second (1,000 Gbs) link will cause a 64 bit
   octet counter to wrap in just under 5 years.  Conversely, an
   81,000,000 terabit/second link is required to cause a 64-bit counter
   to wrap in 30 minutes.  We believe that, while technology rapidly
   marches forward, this link speed will not be achieved for at least
   several years, leaving sufficient time to evaluate the introduction
   of 96 bit counters.
...

I suspect that you are not using thr 64 bit counters.  

Connie Logg (cal at slac.stanford.edu), Network Analyst
Stanford Linear Accelerator Center
2575 Sand Hill Road (ms 97), Menlo Park, CA 94025
"Happiness is found along the way, not at the end of the road"  

-----Original Message-----
From: Markus.Forrer at coop.ch [mailto:Markus.Forrer at coop.ch]
Sent: Friday, November 16, 2001 2:38 AM
To: rrd-users at list.ee.ethz.ch
Subject: [rrd-users] Problems monitoring Gigabit Links



Good Morning :))

Here we are monitoring a lot of WAN and LAN Links with MRTG without
Problems.

Now I have the job, to monitor Gigabit Link of a Exteme Black Diamond Box.
The Problems is that on this link, is a lot of traffic and the snmp counter
wraps more than one time if the link is to 50% used....

Can I poll with RRD the device in 30s rythmus?? Or are the solutions to do
it with MRTG??

Regards

COOP / NCC
Markus Forrer


--
Unsubscribe mailto:rrd-users-request at list.ee.ethz.ch?subject=unsubscribe
Help        mailto:rrd-users-request at list.ee.ethz.ch?subject=help
Archive     http://www.ee.ethz.ch/~slist/rrd-users
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi

--
Unsubscribe mailto:rrd-users-request at list.ee.ethz.ch?subject=unsubscribe
Help        mailto:rrd-users-request at list.ee.ethz.ch?subject=help
Archive     http://www.ee.ethz.ch/~slist/rrd-users
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi