Cisco 4221 router with two NIM ES2-8 switch module

[Robbins_Roland]

Have a Cisco 4221 router with two NIM ES2-8 Switch modules and need help setting up the router so that I can pass data from one NIM ES2-8 Switch module port to the second NIM ES2-8 switch module ports.

[Flavio Miranda]

Hi

 Your question is unclear. What to mean by passing traffic between NIM. If they a installed preperly, you should see the ports and use it acordingly. 

[Robbins_Roland]

Currently the NIM 1 ES2-8 Module and the NIM 2 ES2-8 Module can Ping or pass data with in the 8 ports of each module but cannot ping or pass data between the two NIMs. Example (if PC is connected to NIM 1 ES2-8 module port 2 and another PC is connected to NIM 2 ES2-8 module port 2, the PCs cannot ping each other. they can only see equipment that is connected on the same NIM module.).

[balaji.bandi]

Switch module act as layer 2, if they belong to Layer 2 they able to connect each other, if they are different VLAN, you need to have router having ip routing

check the below guide :

https://www.cisco.com/c/en/us/td/docs/routers/access/interfaces/NIM/software/configuration/guide/4_8PortGENIM.html

post show run and explain what port devices conencted what is the IP address of each device to understand the issue.

[sp2720401]

Maybe a bug or version requirement to get full access to the MGF. The 4221 needs at least 16.4(1). The layer 2 NIMs each share a 1gbps channel to the the fabric and the two NIMs should act as a single L2 domain.