Find IP address/machine connected to a cisco switch port

Question

hello,
I need to know which IP/device is connecetd to a cisco Switch port.
I can get the mac-address of that switch port using sh mac-add command, but with the mac address how can i find that which ip belongs to this mac.
is there way i can do this, i know i can do the other way meaning with IP i can find to which port its connected ,but dont know how to find this MAC to IP with switch without the need for additional tools

Answer 1

Hey Anantha ,
Hop u r doing good,
If u dont know ip address of devices present on specific vlan and wanted to track end device ip address please try
follow this below
steps 1:ping it to brodcast ip address of subnet
for ex
R1--SW1--SW2--(H1
                             --H2
R1..1.1.1.1/24
H1..1.1.1.2/24
H2.1.1.1.3/24
So u r brodacast ip is 1.1.1.255
ping  1.1.1.255
Sending 1000, 100-byte ICMP Echos to 1.1.1.255, timeout is 2 seconds:
Reply to request 8 from 1.1.1.2, 28 ms
Reply to request 9 from 1.1.1.3, 64 ms
u will get reply from all host present on that segment and ur arp table will get flood with ip and respective mac on
your L3 device...(R1 in this example)
Step2: then u can use command
sh ip arp ..to see ip and respective mac associate with it
R1#sh ip arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  1.1.1.1                 -   c000.2498.0000  ARPA   Vlan2
Internet  1.1.1.2                 0   c003.2498.0000  ARPA   Vlan2
Step3: see the mac learned from specific port
R1#sh mac address c003.2498.0000
Destination Address  Address Type  VLAN  Destination Port
c003.2498.0000          Dynamic       2     FastEthernet1/1
Step4:If  u have all cisco devices then u can use CDP
to check wht device connect to ur interface
R1#sh cdp ne fa1/1 detail
Device ID: SW1.lab.local
Follow this way, hop u will trace devices present on ur network
Hop this informative,
Regards,
Ashish shirkar