OT: query routers tables

[Jamie Bohr]

This question is way off topic, sorry.  I have googled and googled and have
not come up with a answer to my question.

I want to query a switch (via SNMP I think) to get a list of systems
attached to it.  I am using Nagios and would like to determine switch/router
dependencies.  Trace route will not work because it will not show
routers/switches for systems on the same sub-net as the system doing the
trace route and I have seen where it does not return the network based
switch a system is attached to, just the router.  If I could get a list
systems attached to a router/switch (not a personnel switch, a managed
switch) I can correlate the information and build dependencies.  I have a
hand-held Fluke network tester than runs Linux that will do this for me when
I type in a hostname, I would rather do it programmaticly because I have
over 300 systems I need to do.  I am open to any method that works that I
can script so I don't have to do it every time a new system appears.  Just
in case it matters some systems are attached to a V-lan off a managed switch
and I do NOT have admin rights to the routers or switches.

-- 
Jamie Bohr