How to set a MAC address on a Cisco 3700 router.

Posted: May 28, 2015. At: 2:01 PM. This was 3 years ago. Post ID: 8216
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This command in interface configuration mode will change the MAC address for a specific interface on the router.

R1(config-if)#mac-address DE.AD.BE

And this is what I get when I use the show run command and view the properties of the interface.

interface FastEthernet0/0
 mac-address 00de.00ad.00be
 ip address
 ip nat inside
 ip nat enable
 ip virtual-reassembly
 duplex auto
 speed auto

The MAC address is shown this way. I am not sure why it is entered this way, but that is Cisco`s way of doing things.

And this is why you are more careful when assigning an IP address.

oberyn(config-if)#ip address
% overlaps with FastEthernet0/0

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