[mrtg] Re: Cisco 2950 - IP addresses

[Shane Castle [AIX]]

The command 'sho mac-ad' on the 2950 will display the MAC table, but
it's not correlated with IP addresses.  The 2950 won't know those since
it's strictly a layer-2 device.  You need to go to the nearest router
and look at its ARP table; for Cisco routers the command is 'sho ip arp'
and more recent IOS versions can display the IP address for a particular
MAC address (e.g., 'sho ip arp 00b0.d0f3.d495').

There's a component of CiscoWorks 2000 LMS, Campus Manager, that will
put that info together and display it for you nicely but CW2K is pricey.
You can actually get all the necessary info via SNMP queries but it's
a fair amount of research and programming to put it all together.

So I think the short answer is, no, there's not an easier way.

--
Shane Castle
Boulder County Info Svcs
Boulder CO

On Tue, 10 Jun 2003, Jonathan wrote:

>Hi,
>
>Hope someone can help. I'm trying to use MRTG properly for the first 
>time and it's certainly provided a lot for me to sink my teeth into.
>
>I'm wanting to be able to monitor 7 Cisco 2950 switches and I've been 
>asked if it's possible to list the IP addresses which are related to 
>each port.
>
>I realised I could write something to scan through the ARP table to 
>process this, but I figured there must be an easier way?
>
>I haven't a clue where to look for this sort of information and my 
>Googling has so far not produced anything useful. If someone could point 
>me in the right direction, it would be much appreciated.


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