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Contributor

Hello

Hello

i use the folowing two TCL file

the arp example answers your query. the other is also very usefull

reanme to .TCL and tftp to the flash drive on the router or switch

create an alias, see the file comment for an example 

NOTE, i did not create them. If you share them , please keep the orginal creator details in the file

if you like these , please vote and rate my comments

router#arp
IP address MAC address    Physical intf        Logical intf
========== ============== ==================== ===========
10.0.27.2  c464.13dc.faa0 GigabitEthernet0/3/0
10.0.27.7  001d.e622.0a38 GigabitEthernet0/3/0
10.0.112.1 f0f7.550f.0c60 GigabitEthernet0/0
10.0.112.2 c464.13dc.fa80 GigabitEthernet0/0
10.0.123.2 c464.13dc.fa81 GigabitEthernet0/1
10.0.123.3 f0f7.5523.b5f1 GigabitEthernet0/1
10.1.20.1  c464.13dc.fa83                       Vlan120

router#ipconfig
Interface                  IP Address    MTU State
==============================================================
Embedded-Service-Engine0/0 no address         admin down
GigabitEthernet0/0         10.0.112.2/24 1500 up
GigabitEthernet0/1         10.0.123.2/24 1500 up
GigabitEthernet0/2         10.0.24.2/24  1500 admin down
GigabitEthernet0/3/0       10.0.27.2/24  1500 up
GigabitEthernet0/1/0       no address         down

Advisor

http://packetpros.com/find-a

http://packetpros.com/find-a-device-in-the-network/

Beginner

have you tried to configured

have you tried to configured the dhcp snooping?

that would work and you can find the ip with the mac-add

look on cisco how to configure the dhcp snooping 

sh ip dhcp snooping binding interface 

Beginner

Hello all.

Hello all.

Just resolved such an issue.

Go to L3 device where Interface Vlan is configured and do "debug arp".

All correctly configured devices usualy send ARP requests to discover IP-gateway. So this ARP-request should be seen in debug like this:

11:38:45: IP ARP req filtered src 10.154.39.12 f081.af80.31e8, dst 10.154.39.9 0000.0000.0000 wrong cable, interface Vlan2

"10.154.39.12" is what I was looking for.

Beginner

Hi everyone,

Hi everyone,

I just found a different way to get the information.

This assumes that you have IP tracking on and a switch that supports it. The 3850 does!

Enter:    show ip device tracking interface g1/0/4

Result:

--------------------------------------------
Interface GigabitEthernet1/0/4 is: STAND ALONE
IP Device Tracking = Enabled
IP Device Tracking Probe Count = 3
IP Device Tracking Probe Interval = 30
IPv6 Device Tracking Client Registered Handle: 5
IP Device Tracking Enabled Features:
HOST_TRACK_CLIENT_SM
--------------------------------------------
10.2xx.2xx.xxx 20bb.c092.xxxx 524 GigabitEthernet1/0/4 30 ACTIVE ARP

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