[c-nsp] Network Topology Mapping

[Bill Nash]

Correlate ARP cache to bridge tables. You can do it from your core 
switches as a start. It's THE best way for finding anything talking on 
your network.

- billn

On Sun, 28 Oct 2007, Sami Joseph wrote:

> Hi Roland,
> 
> Thanks.
> 
> The point is i dont really know all the devices we have, so i cant be sure
> that they all have snmp and CDP configured.
> 
> Is there a way around that?
> 
> on the top of my head, i would do a port scan and based on that i would go
> into each device and make sure each has SNMP and CDP before i start
> discovering.
> 
> Which open source one would you recommend ?
> 
> How about CiscoWorks?
> 
> Thanks,
> Sam
> 
> On 10/28/07, Roland Dobbins <rdobbins at cisco.com> wrote:
> >
> >
> > On Oct 28, 2007, at 3:27 PM, Roger Oliver wrote:
> >
> > > I'm very interested to hear what others do.
> >
> > PacketDesign RouteExplorer does good visualizations based upon BGP
> > and IGP, and Narus InSight Manager does visualization based upon
> > BGP.  There are also tools like lanmap, which watch packets via RSPAN
> > in a given locality.
> >
> > Several of the open source and commercial NMS systems do SNMP-based
> > autodiscovery; it's important to test these out and ensure they're
> > tuned not to be overly aggressive prior to running the autodiscovery,
> > monitor your network while it's taking place, do it during a
> > maintenance window, etc.
> >
> > Some folks use GraphViz with a bit of Perl-fu on their configs to
> > generate graphs, too.
> >
> > -----------------------------------------------------------------------
> > Roland Dobbins <rdobbins at cisco.com> // 408.527.6376 voice
> >
> >            I don't sound like nobody.
> >
> >                 -- Elvis Presley
> >
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