[nsp] Graphing packet loss

[atticus at satanic.org]

> We would like to graph the percentage pkt loss per line via MRTG polling
> of Cisco routers (7200s and 7500s).  I would think that
> (ifOutDisards+ifOutErrors)/ifOutUcastPkts
> (ifInDiscards+ifInErrors)/ifInUcastpkts
> should give the needed result.  But others are not sure.

> We run policy-map shaping on some of the lines and some of the class
> maps rate limit p2p things like Kazaa and Gnutella.

Depending on how complex your maps are, you may be able to just watch
class-default via CISCO-CLASS-BASED-QOS-MIB.

Otherwise, best approach would probably be setting up SAA and monitoing
those results..