Sharing IP addresses on interfaces

Sharing IP addresses on interfaces.
Let's start things off with a simple one.

Note how Cisco IOS will prevent you from configuring the same IP address on more than one interface. For example

Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#int ethernet 0
Router(config-if)#ip address
Router(config-if)#no shut
Router(config-if)#int serial 0
Router(config-if)#ip address
% overlaps with Ethernet0

Now, given this fact can you tell me what legal configuration results in the following output that clearly shows the same IP address on two different interfaces?

Router# show ip interface brief

Interface IP-Address OK? Method Status Protocol
Ethernet0 YES manual up up
Serial0 YES manual up up

There is enough information here to answer the question. If you need any more information or if you think you know the answer, use the comments for this blog entry to communicate that.


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