From: Jersey Guy (guy.jersey@gmail.com)
Date: Tue Feb 10 2009 - 16:40:59 ARST
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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