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тАО10-29-2003 08:13 PM
тАО10-29-2003 08:13 PM
Traffic on switch ports
I'm seeing a strange behaviour of my procurve switches (a gl4104 and a 4000M) and was wondering if you coul hlp me.
About a week ago, i started monitoring lan traffic with MRTG (my switches have SNMP capabilities, so why not use them) and this is what i don't get: for each (enabled and connected) port, mrtg registers a costant activity of about 4-5 kbit/s (one-way, from the switch to the nic) when the PC attached to that port is ON and about 1 Kbit/s when it's OFF.
Now, i could understand if the switches sent a packet every now and then to see if the PC was on or off, but it seems too much traffic to be simply that (mrtg polls the hardware every 5 minutes and the value it gets is the average data sent/received since last check).
Any idea?
Thank you,
Alberto
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тАО10-30-2003 02:30 AM
тАО10-30-2003 02:30 AM
Re: Traffic on switch ports
Does seem a little strange that it sends out data to an off PC but the PC probably has a Wake from LAN capabilities and never really turns its NIC off.
Ron
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тАО10-30-2003 06:21 PM
тАО10-30-2003 06:21 PM
Re: Traffic on switch ports
Andreas Koertel
ProCurve product development
switching routers
wireless security
PS: check for dual intel nic's using the proset sw and fault tolerant setting - lot's of broadcasts.....
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тАО10-30-2003 06:21 PM
тАО10-30-2003 06:21 PM
Re: Traffic on switch ports
About the nics having WOL... i think it's true: even with the PC "off", the led of the nic is still on; and, after all, i would expect they have this feature: they are either 3com or Intel cards...
Bye,
Alberto
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тАО10-30-2003 06:24 PM
тАО10-30-2003 06:24 PM
Re: Traffic on switch ports
I agree and if it is turned off - it's off. Do a short trace and you will find the issue since you have the mac address where it came from.
AK
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тАО10-31-2003 03:20 AM
тАО10-31-2003 03:20 AM
Re: Traffic on switch ports
My experience of pointing MRTG to a switch is not too extensive but MRTG has always been a "rough counter" rather than a "precision counter".
You said that the port registered 1 kbit/s when the OFF. That's shouldn't be the case, MRTG should register 0 kbit/s.
The 4000Ms are Layer 2 switches and will not send any packets to any PC to check any status. Even though the 4100gl are Layer 3 switches, I see no reason for them to be sending packets out to PCs.
IMHO, it's the inaccuracies in MRTG.
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тАО10-31-2003 03:27 AM
тАО10-31-2003 03:27 AM
Re: Traffic on switch ports
However, i agree that MRTG has some accuracy problem, but in this case, i believe that rounding (up or down) a value of 0 (bits/bytes/pkts/whatever) would yield the correct result :-)
Bye,
Alberto