software wanted

[Gregory Edigarov <greg () bestnet kharkov ua>]

Hi everybody,

can anybody recomend a piece of software, that could "graph" a live
network scanning it via snmp.
requirements are:
1. must produce a text output suitable for postproduction. graphviz is
an ideal, xml - acceptable.
2. must use no external database i.e. have text config file. clean text
console, suitable to run as a cronjob.
3. must be able to work in heterogenous environment. 

thanks a lot in advance

-- 
With best regards,
        Gregory Edigarov