[Ntop] Netflow aggregation

[John Hally]

I had the same issue, and by setting up the router cache aggregation as 'as'
and setting Ntop to 'no aggregation' I started getting all the stats again.

 

I also sometimes have a problem with the netflow plugin failing every once
in a while during a restart.

 

Hope that helps.

 

  _____  

From: ntop-bounces at unipi.it [mailto:ntop-bounces at unipi.it] On Behalf Of Luke
McConnell
Sent: Thursday, March 10, 2005 10:38 AM
To: 'ntop at unipi.it'
Subject: RE: [Ntop] Netflow aggregation 

 

Are people running the AS-aggregation option successfully? Everything works
fine without it, but as soon as I enable it the only page that still shows
any information is the "Global Traffic Stats" page. I am exporting from a
Cisco 7200 series (without aggregation) and I know that the AS data is being
exported. Does anyone have any ideas?

 

Thanks,

 

Luke

 

  _____  

From: John Hally [mailto:JHally at epnet.com] 
Sent: 10 March 2005 15:13
To: 'ntop at unipi.it'
Subject: RE: [Ntop] Netflow aggregation 

Thanks Burton,

 

What I'm looking to do is to gather usage stats based on AS.  I'm currently
aggregating based on AS at the border routers and doing no aggregation via
Ntop, and I think that's working out ok.

 

One question I have is, is there a way to keep the AS Info stats (RRD?) so
that when the process gets restarted I don't lose what's reported under
Summary/AS Info?

 

Thanks!

 

  _____  

From: ntop-bounces at unipi.it [mailto:ntop-bounces at unipi.it] On Behalf Of
Burton Strauss
Sent: Wednesday, March 09, 2005 5:47 PM
To: ntop at unipi.it
Subject: RE: [Ntop] Netflow aggregation 

 

Basically, it's what YOU need it to be to meet YOUR needs.

 

Aggregating at the router (netflow collector, technically) reduces the
amount of bandwidth consumed for monitoring (and reduces the load on ntop).
But it's more difficult (sometimes) to change the collector options.

 

Aggregating in ntop is easy to change (just flip the dropdown).  But it
means ntop is processing each flow.

 

Whichever way you aggregate, that's the level of detail ntop reports.  No
drill-down, etc.  just the aggregated data.

 

-----Burton

 

 

  _____  

From: ntop-bounces at unipi.it [mailto:ntop-bounces at unipi.it] On Behalf Of John
Hally
Sent: Wednesday, March 09, 2005 4:19 PM
To: 'ntop at unipi.it'
Subject: [Ntop] Netflow aggregation 

Hello All,

 

Can someone tell me what the benefits of the different netflow aggregation
options are?  Is it better to not aggregate at the router, and then set up
aggregation on Ntop, or should they 'line up', meaning, set AS aggregation
on the router and also in ntop?

 

 

I guess which type of aggregation you choose will also effect the type of
reporting that Ntop is going to produce, correct?

 

Thanks in advance!

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