From: Jared Scrivener (jscrivener@ipexpert.com)
Date: Tue Feb 10 2009 - 15:47:23 ARST
Oh, and further to that, look at the OUI in the MAC address if you can't
work out which is which. The first 6 hex characters are assigned to vendors
so you should be able to quickly identify the standout as most of your
servers and PC's will have similar OUI's (if you have a standard hardware
platform). Google for the OUI codes of the standouts until you find the
Cisco one.
Cheers,
Jared Scrivener CCIE3 #16983 (R&S, Security, SP), CISSP
Technical Instructor - IPexpert, Inc.
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
Mailto: jscrivener@ipexpert.com
-----Original Message-----
From: Jared Scrivener [mailto:jscrivener@ipexpert.com]
Sent: Tuesday, 10 February 2009 12:44 PM
To: 'Luan Nguyen'; 'Scott Morris'; 'Jersey Guy'
Cc: 'Cisco certification'
Subject: RE: what's on the other side of a GigE port?
Luan is right, so leverage the commands he referenced. That's what I was
inferring you to do after the pings - look at your MAC table to find the
responses for a certain port then the ARP table to associate it to the IP.
Cheers,
Jared Scrivener CCIE3 #16983 (R&S, Security, SP), CISSP
Technical Instructor - IPexpert, Inc.
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
Mailto: jscrivener@ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Luan
Nguyen
Sent: Tuesday, 10 February 2009 11:38 AM
To: 'Scott Morris'; 'Jersey Guy'
Cc: 'Cisco certification'
Subject: RE: what's on the other side of a GigE port?
If you know what port that device connects to, do a show mac-address-table |
inc xxx to find out the mac address connect to that port, then do a show ip
arp *mac-address* that you found on the previous command to find out the IP
address.
Regards,
Luan Nguyen
Chesapeake NetCraftsmen, LLC.
[W] http://www.netcraftsmen.net
[M] luan@netcraftsmen.net
[Blog] http://cnc-networksecurity.blogspot.com/
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Scott Morris
Sent: Tuesday, February 10, 2009 11:25 AM
To: 'Jersey Guy'
Cc: 'Cisco certification'
Subject: RE: what's on the other side of a GigE port?
That's the point. You won't. As far as you can tell they are all equally
reachable.
That's part of why CDP is quite helpful.
What difference does it make? If that device isn't under your control
anyway?
Scott
From: Jersey Guy [mailto:guy.jersey@gmail.com]
Sent: Tuesday, February 10, 2009 10:55 AM
To: smorris@internetworkexpert.com
Cc: Cisco certification
Subject: Re: what's on the other side of a GigE port?
Scott,
It *is* an L3 device but how do you know *which* one it is? The LAN address
is a /23. When I do a broadcast ping, I get a 100 responses. Don't know what
response is coming from what port.
I want to see the IP address that's configured on the device at the other
end of po20.
A56M00S14#show run int po20
!
interface Port-channel20
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 326
switchport mode trunk
logging event trunk-status
load-interval 30
end
A56M00S14#show vlan brief
VLAN Name Status Ports
---- -------------------------------- ---------
-------------------------------
326 Access_VLAN326 active Gi1/1, Gi1/2, Gi1/3, Gi1/4
Gi1/5, Gi1/6, Gi1/7, Gi1/8
Gi1/9, Gi1/10, Gi1/11,
Gi1/12
Gi1/13, Gi1/14, Gi1/15,
Gi1/16
Gi1/17, Gi1/18, Gi1/19,
Gi1/20
Gi1/21, Gi1/22
thanks, GJ
On Tue, Feb 10, 2009 at 10:40 AM, Scott Morris
<smorris@internetworkexpert.com> wrote:
If an L2 device, you don't. If an L3 device, ping.
Otherwise, my vote is Gremlins.
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Jersey Guy
Sent: Tuesday, February 10, 2009 9:46 AM
To: Cisco certification
Subject: what's on the other side of a GigE port?
Ya I know, this is Networking-101, shame on me....but I can use some help
here....
Assuming there's no CDP running on the box, how do I find out the IP address
of the devices that are connected to GigE ports on my WS-C4948?
*GigabitEthernet1/23 unassigned YES unset up
up
GigabitEthernet1/24 unassigned YES unset up
up
*Assume these are dedicated switch ports with only one device on the other
end. *
*thanks, JG*
*
Blogs and organic groups at http://www.ccie.net
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