[c-nsp] Network Topology Mapping

[Frank Zwart]

Bill Nash wrote:
> 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.
>   
That is exactly what I did, after a lot of pinging and checking the ARP 
cache I created our network weather map.. :) 
(http://www.network-weathermap.com)
In combination with MRTG(/Nagios/Smokeping) this is a nice tool to 
monitor your network and the traffic flow through your network..

Frank Zwart


> - 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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>>>       
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