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! I’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 Address’s.
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