MAC address to IP address

[Anand Narayana]

Hi,

is there any utility or feature availble in cisco switch/router to find the IP address by entering the MAC address?

eg. abc.efg.hij.klm.nop.rst 10.1.1.1

[ankurbhasin]

Hi Friend,

You can run this command on your layer 3 switch or router

show ip arp [mac-address]

mac-address 48-bit MAC address

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipras_r/1rfipadr.htm#wp1020730

HTH, if yes please rate the post

Ankur

[Anand Narayana]

Hi,

thanks for the info,also can i find where exactely on which port a IP address or MAC is connected?

[ankurbhasin]

Hi Friend,

Yes you can.

If you have the mac address and you are on a switch you can run a command

"sh mac-address-table address "

It will display the address with the interface number and incase you get a port which is a trunk port this means that actual mac address is on some switch connected to the trunk port and you can again go to the downstream switch and run the same command till the time you reach the end host.

If it is a catos switch you have to run the command

show cam mac_addr

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/sw_8_5/cmd_ref/sh_a_c.htm#wp1028328

it will give you the module/port number.

HTH, if yes please rate the post

Ankur

[shsong21]

Hi, ankurbhasin

Your answer is very great and very detail.

I hope to know your E-mail address.

[ankurbhasin]

Hi Friend,

Happy that you liked my answers and thaks for your appreciation!!

You can reach me at anky_is_yanky@yahoo.com

Regards,

Ankur

[Anand Narayana]

Thank you so much ankur, it really helped me thank you once again.

[ankurbhasin]

Hi Anand,

Thanks if it helped you finding your solution. I will appreciate if you can rate all helpfull post for all people around who try their best to take sometime to read and anwer questions in this forum.

Please rate all helpfull post.

Ankur

[austin.mann]

It was helpful to me - thank you!!!