From: James Matrisciano (jmatrisciano@kenttech.com)
Date: Fri Sep 30 2005 - 12:22:46 GMT-3
I would have been a smart ass and asked for the network documentation
that should already show where it is, or the network managemnt big
picture from cisco works or something like that.... But those answers
are good too :)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Sheahan, John
Sent: Friday, September 30, 2005 11:17 AM
To: Deep Ratan; ccielab@groupstudy.com
Subject: RE: layer-2 interview question
"sh cam dyn" will show you all mac addresses that the switch knows about
from a layer two persective. That includes machines plugged into hubs
that are plugged into switch. It will also know about mac addresses on
other switches that are trunked to the switch.
If you are running IOS, you can easily sort through 10,000 mac addresses
with the following command:
"sh mac-address-table | begin 0009.b7e0.c2e"
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Deep Ratan
Sent: Friday, September 30, 2005 11:04 AM
To: ccielab@groupstudy.com
Subject: Re: layer-2 interview question
does "show cam" display mac address of A) machines directly connected to
the switch ports of the switch or B) machines on all vlans across all
switches in those vlans?
If B) is true, the output of that command could have 10,000 entries.
On 9/30/05, Adam S. Roth <adam@therothfamily.net> wrote:
>
> Show cam
>
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Deep
> Ratan
> Sent: Friday, September 30, 2005 10:48 AM
> To: ccielab@groupstudy.com
> Subject: layer-2 interview question
>
>
> Hi Everyone,
> Sorry to ask a networking-101 question but being a WAN guy, I haven't
been
> working with switches in the past few years. An interviewer asked me
this
> question, "If I give you a MAC address that is causing a broadcast
storm,
> how will you locate the culprit in a switched environment that has
several
> dozen switches and routers?"
>
> I replied, "You'll need to give me a layer-3 address so I can trace it
to
> the right switch/router and then look up the ARP table to see on what
port
> the offending machine lives" The interviewer didn't like the answer.
In
> retrospect, I should probably have said, "A broadcast storm renders
the
> network unusable, so I'll start with looking at my network management
> station to see what LAN segment is giving off a critical alarm"
>
> Anyway, my question to members of groupstudy is this: In an
environment
> with
> several dozen switches, if you're given just a MAC address, can you
find
> out
> where the machine lives?
>
> thanks, Deep
>
>
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