I'm not sure what is downstream of your switch, what types of devices, but
I'm pretty damn sure that there is no command on a catalyst switch (a layer
two device) which will tell you the IP addresses of the devices connected
to it. The switch not only doesn't know, it doesn't care. Presumably you
have a router which is upstream of the switch and all devices hanging off
of the switch have the ip address of the router interface (which connects
to the switch) as their default gateway. Only the router will know the IP
addresses. Depending on your needs and urgency the only way to really deal
with this would be to write a script which takes the cam table from the
switch (which will list mac addresses and ports to which they connect) and
the arp table from the router (which will map mac addresses to IP
addresses) and match them up so you end up with a list of IP associated
with MAC associated with switch port. I am pretty much positive the switch
doesn't know the ip addreses. As you mentioned cdp neighbor detail will
tell you the address, but that will only work for cisco devices running
cdp. Doesn't help you at all for devices from other manufacturers.
At 02:25 PM 11/14/2000 -0500, Peter Van Oene wrote:
>What about looking at the arp cache "sh ip arp" or "sh cam dynamic"
>
>This will list the port, mac, ip relationships on a switch.
>
>Pete
>
>
>*********** REPLY SEPARATOR ***********
>
>On 11/14/2000 at 11:51 AM Sites, Bob wrote:
>
>>I guess I need to clarify this a little. Yes, I'm talking about Cisco
>>switches, 6509 & 5000's. No, I'm not looking for MAC addresses. I thought
>>that there was a command that would list the IP of all connecting devices on
>>(all) ports on the switch. The "sho cdp nei det" or other variations only
>>shows the ip of the ports that are "trunking." I need all of the ports, not
>>just the trunking ports. Any ideas?
>>
>>
>>Can someone refresh my memory on this. What is the command on a switch that
>>will show you the IP address of connecting devices on the ports? Can't seem
>>to get any hits in the archives. I use it so seldom I've forgotten what it
>>was?
>>
>>Bob Sites, CCNA
>>System Engineer
>>
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>
>
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>
Tom Pruneau
Trainer Network Operations
GENUITY
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