From: Jersey Guy (guy.jersey@gmail.com)
Date: Tue Feb 10 2009 - 17:28:50 ARST
Scott, When I did a show mac-address-table I got "lost in the weeds" due to
the 150+ devices. I should have stopped right there to see that I can
eliminate 148 of them by looking at the first two octets of their MAC
address.
Your points are very valid and yes, the approach suggested by Jared and Luan
has its shortcomings but that's all we have to work with, unfortunately. I
was secretly hoping that there's a better, more graceful way of doing this
that I don't know about :)
There *is* CDP running on the box. I just wanted to be prepared in the event
that it's not, in some future scenario, and there's no phone call I can make
to find out what I need to know.....
thanks again, JG
On Tue, Feb 10, 2009 at 2:05 PM, Scott Morris <
smorris@internetworkexpert.com> wrote:
> And there we go! :)
>
>
>
> Glad it worked for ya!
>
>
>
> Scott
>
>
>
> *From:* Jersey Guy [mailto:guy.jersey@gmail.com]
> *Sent:* Tuesday, February 10, 2009 1:41 PM
>
> *To:* jscrivener@ipexpert.com
> *Cc:* Luan Nguyen; Scott Morris; Cisco certification
> *Subject:* Re: what's on the other side of a GigE port?
>
>
>
> Jared, Yours is the best solution thus far, at least from the perspective
> of my scenario, thanks!
>
> Yeah there are two Cisco MACs but one's *this* end of the Etherchannel and
> the other MAC is the far end of the Etherchannel - the one I want :) Winner!
>
> thanks, JG
>
>
> On Tue, Feb 10, 2009 at 1:14 PM, Jared Scrivener <jscrivener@ipexpert.com>
> wrote:
>
> Actually, the top one is a Cisco MAC too (I typo'd it when entering it in
> the search). Judging by the OUI (which is Cisco's original one) it's an old
> device, whereas the 001AA2 MAC is a newer one. Still, you're down to two.
> J
>
>
>
> 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
>
> *From:* Jared Scrivener [mailto:jscrivener@ipexpert.com]
> *Sent:* Tuesday, 10 February 2009 1:04 PM
> *To:* 'Jersey Guy'
>
>
> *Cc:* 'Luan Nguyen'; 'Scott Morris'; 'Cisco certification'
>
> *Subject:* RE: what's on the other side of a GigE port?
>
>
>
> Try http://standards.ieee.org/regauth/oui/index.shtml as it has the
> listings of all OUI's.
>
>
>
> According to the database (having done the searching for you) the following
> MAC is a Cisco MAC (and it's the only Cisco MAC listed as the rest are
> mainly VMware with a HP one and some other miscellaneous ones thrown in).
>
>
>
> 326 001a.a20d.9dbf dynamic ip Port-channel20
>
>
>
> So look through your ARP table with a "sh ip arp" using a filter of your
> choice to find the IP. Then document it. J
>
>
>
> 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
>
> *From:* Jersey Guy [mailto:guy.jersey@gmail.com]
> *Sent:* Tuesday, 10 February 2009 12:53 PM
> *To:* jscrivener@ipexpert.com
> *Cc:* Luan Nguyen; Scott Morris; Cisco certification
> *Subject:* Re: what's on the other side of a GigE port?
>
>
>
> A56M00S14#show mac-address-table | i Port-channel20
> 326 0000.0c07.ac01 dynamic ip
> Port-channel20
> 326 001a.a20d.9dbf dynamic ip
> Port-channel20
> 326 001b.78cf.b9b4 dynamic ip
> Port-channel20
> 326 0050.5642.efab dynamic ip
> Port-channel20
> 326 0050.564f.72bb dynamic ip
> Port-channel20
> 326 0050.5683.1212 dynamic ip
> Port-channel20
> 326 0050.5683.123c dynamic ip
> Port-channel20
> 326 0050.5683.14f0 dynamic ip
> Port-channel20
> 326 0050.5683.18b8 dynamic ip
> Port-channel20
> 326 0050.5683.1b83 dynamic ip
> Port-channel20
> 326 0050.5683.224f dynamic ip,other
> Port-channel20
> 326 0050.5683.330e dynamic ip,other
> Port-channel20
> 326 0050.5683.5296 dynamic ip
> Port-channel20
> 326 0050.5683.6d78 dynamic ip
> Port-channel20
> 326 0050.5683.7aef dynamic ip
> Port-channel20
> 326 0050.5686.2503 dynamic ip
> Port-channel20
> 326 0050.5686.4035 dynamic ip
> Port-channel20
> 326 0050.5686.5f68 dynamic ip,other
> Port-channel20
> 326 0050.5687.00b1 dynamic ip
> Port-channel20
> 326 0050.5687.00cd dynamic ip
> Port-channel20
> 326 0050.5687.010d dynamic ip,other
> Port-channel20
> 326 0050.5687.0165 dynamic ip
> Port-channel20
> 326 0050.5687.02fc dynamic ip
> Port-channel20
> 326 0050.5687.039c dynamic ip,other
> Port-channel20
> 326 0050.5687.058c dynamic ip,other
> Port-channel20
> 326 0050.5687.0611 dynamic ip
> Port-channel20
> 326 0050.5687.0619 dynamic ip
> Port-channel20
> 326 0050.5687.079f dynamic ip
> Port-channel20
> 326 0050.5687.07b4 dynamic ip
> Port-channel20
> 326 0050.5687.07f8 dynamic ip
> Port-channel20
> 326 0050.5687.08d6 dynamic ip,other
> Port-channel20
> 326 0050.5687.0c23 dynamic ip
> Port-channel20
> 326 0050.5687.0e28 dynamic ip
> Port-channel20
> 326 0050.5687.0e3d dynamic ip
> Port-channel20
> 326 0050.5687.0ee7 dynamic ip
> Port-channel20
> 326 0050.5687.100a dynamic ip,other
> Port-channel20
> 326 0050.5687.10a6 dynamic ip
> Port-channel20
> 326 0050.5687.111b dynamic ip,other
> Port-channel20
> 326 0050.5687.12a0 dynamic ip,other
> Port-channel20
> 326 0050.5687.13ac dynamic ip
> Port-channel20
> 326 0050.5687.13cb dynamic ip,other
> Port-channel20
> 326 0050.5687.1409 dynamic ip,other
> Port-channel20
> 326 0050.5687.168e dynamic ip,other
> Port-channel20
> 326 0050.5687.1695 dynamic ip
> Port-channel20
> 326 0050.5687.18c0 dynamic ip,other
> Port-channel20
> 326 0050.5687.19a1 dynamic ip
> Port-channel20
> 326 0050.5687.1a4e dynamic ip,other
> Port-channel20
> 326 0050.5687.1c19 dynamic ip
> Port-channel20
> 326 0050.5687.1cc5 dynamic ip
> Port-channel20
> 326 0050.5687.1dd6 dynamic ip
> Port-channel20
> 326 0050.5687.1ebe dynamic ip
> Port-channel20
> 326 0050.5687.1fb4 dynamic ip,other
> Port-channel20
> 326 0050.5687.2034 dynamic ip
> Port-channel20
> 326 0050.5687.2084 dynamic ip,other
> Port-channel20
> 326 0050.5687.2107 dynamic ip,other
> Port-channel20
> 326 0050.5687.220c dynamic ip
> Port-channel20
> 326 0050.5687.22c3 dynamic ip
> Port-channel20
> 326 0050.5687.22ea dynamic ip
> Port-channel20
> 326 0050.5687.22fc dynamic ip
> Port-channel20
> 326 0050.5687.2361 dynamic ip,other
> Port-channel20
> 326 0050.5687.2546 dynamic ip
> Port-channel20
> 326 0050.5687.2566 dynamic ip
> Port-channel20
> 326 0050.5687.25c8 dynamic ip
> Port-channel20
> 326 0050.5687.267b dynamic ip
> Port-channel20
> 326 0050.5687.2803 dynamic ip
> Port-channel20
> 326 0050.5687.2810 dynamic ip
> Port-channel20
> 326 0050.5687.29cc dynamic ip,other
> Port-channel20
> 326 0050.5687.2b7d dynamic ip
> Port-channel20
> 326 0050.5687.2c79 dynamic ip,other
> Port-channel20
> 326 0050.5687.2cbd dynamic ip
> Port-channel20
> 326 0050.5687.2cd2 dynamic ip,other
> Port-channel20
> 326 0050.5687.2d33 dynamic ip
> Port-channel20
> 326 0050.5687.2d3d dynamic ip
> Port-channel20
> 326 0050.5687.2ef1 dynamic ip,other
> Port-channel20
> 326 0050.5687.302c dynamic ip,other
> Port-channel20
> 326 0050.5687.312e dynamic ip
> Port-channel20
> 326 0050.5687.3280 dynamic ip
> Port-channel20
> 326 0050.5687.32db dynamic ip,other
> Port-channel20
> 326 0050.5687.339d dynamic ip
> Port-channel20
> 326 0050.5687.33d1 dynamic ip,other
> Port-channel20
> 326 0050.5687.33de dynamic ip,other
> Port-channel20
> 326 0050.5687.3466 dynamic ip
> Port-channel20
> 326 0050.5687.356b dynamic ip
> Port-channel20
> 326 0050.5687.37bf dynamic ip,other
> Port-channel20
> 326 0050.5687.37e4 dynamic ip
> Port-channel20
> 326 0050.5687.380f dynamic ip
> Port-channel20
> 326 0050.5687.38f2 dynamic ip,other
> Port-channel20
> 326 0050.5687.39c4 dynamic ip
> Port-channel20
> 326 0050.5687.3ca8 dynamic ip
> Port-channel20
> 326 0050.5687.40b3 dynamic ip,other
> Port-channel20
> 326 0050.5687.41e2 dynamic ip
> Port-channel20
> 326 0050.5687.4330 dynamic ip,other
> Port-channel20
> 326 0050.5687.43ce dynamic ip,other
> Port-channel20
> 326 0050.5687.43f5 dynamic ip,other
> Port-channel20
> 326 0050.5687.455c dynamic ip
> Port-channel20
> 326 0050.5687.4746 dynamic ip
> Port-channel20
> 326 0050.5687.48cd dynamic ip
> Port-channel20
> 326 0050.5687.4a34 dynamic ip
> Port-channel20
> 326 0050.5687.4b70 dynamic ip
> Port-channel20
> 326 0050.5687.4cdd dynamic ip
> Port-channel20
> 326 0050.5687.4d7a dynamic ip,other
> Port-channel20
> 326 0050.5687.4e82 dynamic ip,other
> Port-channel20
> 326 0050.5687.4f13 dynamic ip
> Port-channel20
> 326 0050.5687.4fa9 dynamic ip
> Port-channel20
> 326 0050.5687.50cd dynamic ip
> Port-channel20
> 326 0050.5687.52e6 dynamic ip,other
> Port-channel20
> 326 0050.5687.53cf dynamic ip
> Port-channel20
> 326 0050.5687.559a dynamic ip
> Port-channel20
> 326 0050.5687.55f5 dynamic ip,other
> Port-channel20
> 326 0050.5687.5960 dynamic ip
> Port-channel20
> 326 0050.5687.5a2f dynamic ip
> Port-channel20
> 326 0050.5687.5b43 dynamic ip,other
> Port-channel20
> 326 0050.5687.5b89 dynamic ip
> Port-channel20
> 326 0050.5687.5c51 dynamic ip
> Port-channel20
> 326 0050.5687.5ea2 dynamic ip
> Port-channel20
> 326 0050.5687.5f46 dynamic ip
> Port-channel20
> 326 0050.5687.601f dynamic ip
> Port-channel20
> 326 0050.5687.60a6 dynamic ip,other
> Port-channel20
> 326 0050.5687.60d4 dynamic ip
> Port-channel20
> 326 0050.5687.6167 dynamic ip
> Port-channel20
> 326 0050.5687.6538 dynamic ip
> Port-channel20
> 326 0050.5687.658e dynamic ip
> Port-channel20
> 326 0050.5687.659c dynamic ip
> Port-channel20
> 326 0050.5687.6621 dynamic ip
> Port-channel20
> 326 0050.5687.6795 dynamic ip,other
> Port-channel20
> 326 0050.5687.6847 dynamic ip
> Port-channel20
> 326 0050.5687.68d1 dynamic ip
> Port-channel20
> 326 0050.5687.6959 dynamic ip,other
> Port-channel20
> 326 0050.5687.6a02 dynamic ip,other
> Port-channel20
> 326 0050.5687.6a53 dynamic ip
> Port-channel20
> 326 0050.5687.6ab7 dynamic ip
> Port-channel20
> 326 0050.5687.6db4 dynamic ip
> Port-channel20
> 326 0050.5687.6e0c dynamic ip
> Port-channel20
> 326 0050.5687.6e49 dynamic ip
> Port-channel20
> 326 0050.5687.6f5a dynamic ip
> Port-channel20
> 326 0050.5687.70f7 dynamic ip,other
> Port-channel20
> 326 0050.5687.718c dynamic ip
> Port-channel20
> 326 0050.5687.71a2 dynamic ip
> Port-channel20
> 326 0050.5687.72eb dynamic ip
> Port-channel20
> 326 0050.5687.73f4 dynamic ip
> Port-channel20
> 326 0050.5687.7597 dynamic ip,other
> Port-channel20
> 326 0050.5687.75cd dynamic ip,other
> Port-channel20
> 326 0050.5687.7650 dynamic ip
> Port-channel20
> 326 0050.5687.7855 dynamic ip,other
> Port-channel20
> 326 0050.5687.7919 dynamic ip,other
> Port-channel20
> 326 0050.5687.7ba6 dynamic ip,other
> Port-channel20
> 326 0050.5687.7d1f dynamic ip
> Port-channel20
> 326 0050.5687.7e35 dynamic ip
> Port-channel20
> 326 0050.56a1.3fcb dynamic ip
> Port-channel20
> 326 0050.56a1.4d7a dynamic ip,other
> Port-channel20
> 326 0050.56a1.7208 dynamic ip,other
> Port-channel20
> 326 00d0.03b0.a00a dynamic ip,assigned
> Port-channel20
>
> Now what? :)
>
> On Tue, Feb 10, 2009 at 12:44 PM, Jared Scrivener <jscrivener@ipexpert.com>
> wrote:
>
> 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*
> *
>
>
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