No, the switch does not have this info. The switch moves Ethernet frames, not IP
packets. The switch doesn't know or care what lies beyond the Ethernet header.
The Ethernet frames it switches can contain IP, IPX, NetBEUI, AppleTalk, or
anything else that will run on top of Ethernet.
The switch does have an ARP table as part of the IP stack it uses for
management. This is totally unrelated to its switching functionality. The switch
might then have IP-to-MAC mappings for hosts that are within its management
interface's subnet, but you'd still have to correlate by hand. It would be nice
if it would perform this correlation for you like CatOS-based switches do in
show arp, but it doesn't.
Basically, you get to do it by hand.
Jason Young
CNS - Network Design, Anheuser-Busch
(314)577-4597
> -----Original Message-----
> From: Rafael A. Reta Rodriguez [mailto:rafareta@icave.com.mx]
> Sent: Wednesday, August 15, 2001 1:32 PM
> To: Young, Jason; Cisco List
> Subject: Re: [nsp] ip-switch port map
>
>
> I hope there is a one steep way to do it than sh arp and sh
> mac, shomething like a
> show ip-address-port. The switch must have this info :-)
>
> "Young, Jason" wrote:
>
> > Locate the MAC address for that IP address, by looking at the
> > workstation/server/whatever, or looking at a handy router
> or other L3 device
> > that would have it in its arp table. Then, use "show
> mac-address-table" on the
> > switch port to find what MAC addresses are at which port.
> >
> > Jason Young
> > CNS - Network Design, Anheuser-Busch
> > (314)577-4597
> >
> > > -----Original Message-----
> > > From: Rafael A. Reta Rodriguez [mailto:rafareta@icave.com.mx]
> > > Sent: Wednesday, August 15, 2001 1:16 PM
> > > To: Cisco List
> > > Subject: [nsp] ip-switch port map
> > >
> > >
> > > How can I know which ip are connected to a certain switch port?
> > >
> > > I have a Catalis 2912 XL.
> > >
> > > TIA
> > >
> > > RafaReta
> > >
>
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