Darren,
If you're pushing steady 120Mbps, and the interval is 5 minutes,
you'll always overflow the 32-bit counter before the next interval.
You can figure this out yourself pretty easily:
120,000,000 / 8 = 15,000,000 octets/sec
15,000,000 octets * 60 seconds in a minute * 5 minutes = 4500000000.
4500000000 is greater than 2**32 (4294967296) = overflow!
At 05:05 PM 7/7/2005, Darren Gibbs wrote:
Javier.
Do you need to reduce or increase the interval to make this work?
I'm in a position where some of my gigabit conencted devices don't
support SNMP V2 or V3, so upgrading them to these versions is not
an option.
Thanks.
Darren
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Javier
Szyszlican
Sent: Friday, 8 July 2005 3:07 AM
Cc: [email protected]
Subject: Re: [jffnms-users] gigabit interfaces
Yes, the number is more closer to 140Mbps but yeah.
You can't if you monitor it every 5 minutes.
Javier
Martin Beecroft wrote:
> Hi Javier,
>
> thanks for getting back to me, please ignore my last post from my home
> address.
>
> Does this mean you can only monitor a port that does no more than
> 115Mb/s with snmp v1?
>
> Cheers
>
> Martin
>
>
> Javier Szyszlican wrote:
>
>>Martin,
>>
>>Sure, thats the problem, the counters are rolling over because we're
>>monitoring them every 5 minutes.
>>
>>So, you better switch to SNMPv2 or SNMPv3 if you want to monitor that
>>kind of bandwidth.
>>
>>Javier
>>
>>Martin Beecroft wrote:
>>
>>
>>>Hello,
>>>
>>>I have been using jffnms to monitor our routers for the past few days
>>>now, and have spotted some anomalies on some gigabit interfaces.
>>>When the traffic graphs should be showing traffic in the region of >
>>>120 Mbit/s it actually shows a very choppy line which goes all over
>>>the place as shown at http://www.beecroft.co.uk/choppy.png. Our
>>>providers graphs do not show this
>>>http://www.beecroft.co.uk/notchoppy.png
>>>
>>>I am using snmp v1, which I assume means the counters are 32 bit,
>>>could this be the problem?
>>>
>>>Has anyone seen this before? Is there any easy way to fix this?
>>>
>>>Regards
>>>
>>>Martin Beecroft
>>>
>>>
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>
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