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Hi All,

I have started analysing traffic on a 3640 using mrtg.

The router has a WIC-1ADSL with a PPPoA dialer connecting to the ISP.
The ATM (ADSL) has a subint configured.

I have observed, using mrtg (mrtg collects stats on all the interfaces
through SNMP) that:

1) int ATM 0/0 reports apparently all the traffic going through the
ATM (ADSL)
2) int ATM 0/0.1-aal5 reports the traffic capped to the link uplink
speed (in my case 448 Kbit/s). Downlink traffic going over that speed
is truncated in the graph.
3) int Dialer10 associated with the above ATM reports a traffic with
speeds up to 56Kbit/s with an average of 16Kbit/s and a shape that
differs from the graph reported by ATM 0/0 and 0/0.1, having some peaks
when there is no activity on the ATM.

My question is:

is the Dialer interface traffic reported, related to the PPPoA protocol
synchronization/authentication? Should this be the case, what is
reported would represent a significant overhead on the total available
bandwidth, is there any way to contain it?

HD