[mrtg] Re: Different traffic on each side of a link

[Dana Hudes]

Broadcast traffic is  definitely going to be a part of any Ethernet even 
full-duplex you still have ARP.
That should, however, take a very small amount of the traffic on a 
full-duplex link.
Also going through a switch are BPDUs if you have spanning tree enabled.
There's no counter at the IP level to tell you unicast/non-unicast octets
BPDUs are definitely *not* IP; ARP is part of IP.

MIB-II has IfInUcastPackets (AFAIK, might be IfInUcastPkts) and 
IfInNUcastPackets (and same for IfOut)

You should be monitoring packet counts anyway .

On Tue, 9 Apr 2002, Nicolai Strøm Gylling wrote:

> Date: Tue, 9 Apr 2002 11:04:32 +0200
> From: Nicolai Strøm Gylling <nsg at webpartner.dk>
> To: mrtg at list.ee.ethz.ch
> Subject: [mrtg] Different traffic on each side of a link
> 
> 
> Hi
> 
> We are using MRTG/RRDTool to monitor and bill the traffic our costumers use. We are monitoring all customers in our end of the link, ex. a port in a switch.
> 
> Due to some problems we have done some monitoring in both ends of a link, and discovered that the trafficamount is not the same. In our testcases in was between an ethernet NIC in a server and a port in a switch (HP ProCurve 2524).
> 
> The trafficamount on the switchport are considerably higher than on the ethernet port in the server. 
> 
> What can cause the different readings from each end of the link? 
> Will broadcast-traffic be answered by the switch, and also appear on the switch-port as traffic?
> Is there a way to differentiate between the different kinds of traffic(broadcast vs. normal traffic), and thereby measure the same traffic-amount in each end of the link? 
> 
> Nicolai Gylling
> 
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