Sounds like it's not receiving data - are you sure you've configured it and activated it?
If so, then you'll have to rebuild with the debug switch for sflow and see what's going on internally, but be prepared for a lot of output. -----Burton -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, March 29, 2005 9:57 AM To: [email protected] Cc: [email protected] Subject: RE: [Ntop] sFlow not working! This doens't help, no trafic at all are seem. If I look inside the sFlow plugin page, I can see this at the end of the page: Number of Flows with Bad Data 0 Total Number of Flows Processed 0 The sFlow Interface Statistics appears correctly. It's look like the plugins work and receive data from the switch but Ntop doesn't procced them. > Check the back traffic - this has come up before - IIRC there are two > kinds of sFlow packets, one is some sort of summary which ntop sees > and ignores. > So you may not really be getting data. But I'm fuzzy on the details - > google for it. Or check the FAQ and see if this makes sense: > > Q. sFlow doesn't work. > A. Check this out: > > This talks about a bad experience I had setting up sFlow reception. > For > the longest > time, I could see that ntop was getting sflow packets, but no > data would show up. > It turns out the switch I was exporting from didn't see any real > traffic, and it was > just sending COUNTERSAMPLE packets..... > > - - - - - - - - I figured out that it was indeed "invalid" sflow > packets. > > Apparently, sflow sends COUNTERSAMPLE and FLOWSAMPLE packets. > COUNTERSAMPLE packets > give a quick look at interface counters on the machine, whereas > FLOWSAMPLE packets > are actual packet fragments from IP connections. Ntop seems to > simply parse, > debug_print, and discard COUNTERSAMPLE packets...which made it > confusing to look at > the debug output and say "wow, lots of sflow coming in!" when in > fact it was just for > show, as Burton suggested. I added more switches (with active > connections) to the > switches sending sflow packets and I now have hosts with pretty > graphs. > > > > -----Burton > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf > Of [EMAIL PROTECTED] > Sent: Tuesday, March 29, 2005 8:14 AM > To: [email protected] > Subject: [Ntop] sFlow not working! > > Hello, > > I'm trying to activate sFlow with Ntop 3.1 and it's not working, no > trafic visible. Here my config: > > sFlow version: 2.99 > Local Collector UDP Port: 6343 > Virtual sFlow Interface network Address: 172.16.0.0/255.255.0.0 > > Flow Senders IP is: 172.16.2.251 > Flow Collector (Ntop) IP is: 172.16.1.215 > > Thanks, > > _______________________________________________ > Ntop mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop > > _______________________________________________ > Ntop mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop > _______________________________________________ Ntop mailing list [email protected] http://listgateway.unipi.it/mailman/listinfo/ntop _______________________________________________ Ntop mailing list [email protected] http://listgateway.unipi.it/mailman/listinfo/ntop
