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If you attempt to ping you device again you should find everything is fine and if you run the show command again you should see the entry in the ARP table now has the new MAC address Internet 10.24.100.54 1 912 ARPA Vlan124 Notice that the MAC address stored is still the original deviceД®nter the below command to clear this single dynamic entry clear ip arp 10.24.100.54 Resolution:ДЎ)В Get yourself into the enable mode on the Cisco switch the device is connected to.Дў) Enter the below command to see the entry in the ARP table for the IP 10.24.100.54. I have replaced a failed printer which has the IP 10.24.100.54 and the MAC address 00:80:77:b6:b:207 with a hot spare printer that has been setup to have the same IP 10.24.100.54 however its MAC address is 00:80:77:82:d9:12, the printer is all connected and configured fine however I am unable to ping or print.

If you replace a device with another device that is still using the same IP address as the original device but has a different MAC address you find that you are unable to connect to it due to the ARP record on your Cisco device is still pointing to the original devices MAC address. If you are new to Cisco or just want to improve your skills I recommend this course from Udemy at the time of writing for just $20 for lifetime access! IвЂ™m also a really big fan of Pluralsight Problem: The ARP table on a Cisco device is a list of learned IP address and what MAC addresses they resolve to, this is required as generally switches work at layer 2 with MAC addresses not IP AddressвЂ™s.

Cisco mac address table issue