L3 Switches - Connecting Networks

[mitchbutter1210]

We have two seperate networks that we need to connect together where both networks are reachable from each other. The first network has a 3850 core switch running EIGRP for local routing (192.x.x.x) and the other seperate network is a 3560cx core also running EIGRP for local routing (172.x.x.x). Both are currently stub networks as they aren't connected. Can these be connected without a router? I need to be able to access the 172 network from the 192 and vice versa. I tried duplicating the 172 network on an older 3560c switch and connected it to the production 192 network but I could never get a neighbor adjacency to form, which led me to assume that I may need a router(s) between the networks to make this work. 

[luis_cordova · Accepted solution]

Hi @mitchbutter1210,

Try connecting both switches with a crossover cable.
In the interfaces that connect the switches, enter the no switchport command.
Assign a point-to-point network between both switches and declare it in EIGRP in both switches.

With this, you should get both networks to know each other.

Regards

[mitchbutter1210]

Thank you! This worked.