If the address is on the same subnet as the switch's management address, an ARP request will be sent looking for the MAC address of the host. This blog shows how to do so in a Cisco environment trying to find the IP address 10.1.4.40. Here are various solutions that may help you determine which device is connected to which port on your Cisco switch. In the Layer-3 device ( mostly a router or layer 2.5 switch ) run the “show ip arp” command. You can do it using the following commands: traceroute show ip arp show mac add | show mac-add add router#show ip dhcp binding | inc (mac address in format aaaa.bbbb.cccc) or alternatively you can learn it via ARP at this point (again on l3 switch or router) router#show ip arp | inc (mac address in format aaaa.bbbb.cccc) If you get a mac-address but still are unable to get an IP your next step would likely be to use a PCAP tool like wireshark. You will see the MAC address related to client’s switch port via this table. 0 Votes If you have Mac Address than , login to your cisco l3 switch which is connected to L2 Switch , In Cisco L3 Switch Type # sh ip dhcp binding assigned . An appliance solution At Interop 2007, I … First connect using putty to the core switch of the site that is doing the routing. I have a problem in configuring the ports to different vlans, I have more than 200 IP cameras and also access points and more than 500 data port for PC and IP phone. Displays the trunk that the bridge group uses to connect to the Ethernet switch. After getting the MAC address it is time to find the IP address of the client ! 2.Now you can look at the ARP cache and find the MAC address of the host you are looking for (show ip arp) and its corresponding interface. type . If the end device triggered some sort of log event, for instance a DHCP reject, it will be identifiable by looking the log data since the output will display interface, MAC address, and IP address … To find the port you must already have a good understanding of the network topology and have access to the switches CLI. It may just be that documentation is being created. If the other switch is an Extreme and they have common layer 3 management vlan between them then a show edp port (connecting port ) detail will show you the ip address of connected Extreme switch. Show mac-address address {address of MAC in xxxx.xxxx.xxxx format). How to find which device is connected to the switch port using mac address? which will output the contents of the log buffer before the buffer was flashed. Finding the switchport a device is connected to is very easy. To determine the IP address, go to the Layer-3 device that you switch is connected to. ib-bridge-port . show ip arp inspection log. IP address of the host. If you know the mac address of that switch then you can also go to another switch/router and use that mac to find the arp entry. Once you issue that command it will give you information about that MAC including the switchport it is connected to.