From: Deep Ratan (deep.ratan@gmail.com)
Date: Fri Sep 30 2005 - 13:54:22 GMT-3
Sean, Your reply has further clarified the issue for me. Thanks much!
On 9/30/05, Sean C <Upp_and_Upp@hotmail.com> wrote:
>
> First question I think would need to be asked if the switched environment
> is
> only 1 vlan or multiple vlans. I would think the interview saying
> 'switched
> environment' would make me think of only one Vlan. But with the routers
> involved, I'd start to think there were possibly multiple vlans. The
> reason
> I would ask this, if all in 1 vlan you should be able to find the IP from
> any switch on the network. But if using multiple vlans, and assuming
> you're
> on 1 vlan and the mac in question is on a different vlan, you can't
> ascertain the IP the same way. If you knew the IP, like you mentioned, you
> at least could figure out the next hop's mac, go to that device and repeat
> the process to find the final device. My gut assumption would be just 1
> Vlan. I'd clarify the question (was the interviewer a CCIE proctor?) ;-)
>
> If on one Vlan, let's say you're on Switch1 and switch10 is the switch
> with
> the PC locally attached that has the noisy NIC. If on Switch1, you do a
> 'show mac-add | i <mac-address>, you'll see the IP of the PC.
>
> In this instance, my PC is on switch 5, which trunks to switch 4, which
> trunks to switch3, which trunks to switch2, which trunks to switch 1. All
> switches are on the same vlan - vlan 10. When I'm on Switch1 and do a
> 'show mac-add | i <my PC mac>', I see the MAC address of my PC, not of any
> of the switches in between us:
>
> Switch1#sh arp | i 111a.95d3
> Internet 10.10.10.203 <http://10.10.10.203> 2 0011.111a.95d3 ARPA VLAN10
>
> c:\>ipconfig
> Physical Address. . . . . . . . . : 00-11-11-1A-95-D3
>
> If I try to search for a mac on a different Vlan - it 'may' be a different
> story.
>
> HTH,
> Sean
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