Cisco – How to configure two routers to advertise the same network out different ports using EIGRP?

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I have VLAN 3 with the IP address of 172.16.0.1 on R0 and on R2, and I can't get them to ping one another. How do I need to advertise them if they are both on the same network? Any help would be much appreciated

Best Answer

Long story short, while it is possible to do what you are requesting, it is inadvisable.

With the broad range of the 172.16.0.0 to 172.31.255.255 (1,048,576 total IP addresses) there is really no reason to not further subnet your network and avoid any potential routing issues.

A better setup might be to split the network into 172.16.0.0/25 and 172.16.0.128/25.

Trying to make the current setup work is simply adding more complexity to the system, rather than fixing the underlying issue which is a flawed initial design.

The following document might be sixteen years old, but pretty much everything in it still rings true. The Twelve Networking Truths

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