Cisco 3925 Enhanced EtherSwitch Service Module

[shamg1974]

How does the SM-ES3G-16-P switch module actually talk to the 3925 router? Through port 17 or 18? If so, do I need to configure those interfaces as routed ports within the same subnet? Or are they just trunks? All connections within the switching module would need to talk to outside devices. If anyone has a configuration example, it would be greatly appreciated.

Thanks,
Bobby

[michael o'nan]

Power off your router and install this card. Once you power the router back on you will notice new interfaces are available for configuration. No additional configuration is needed for these ports to "communicate" with your router. You can then proceed to configure the ports like you would on a regular switch. As long as your NAT is configured properly you will have no issues with devices getting to the internet from this module.

[Akash Agrawal]

Hi,

In such switching modules, we have two logical ports between router and switch module. Gig1/0 is the layer3 port, while the second, Gig1/1 is layer2. Meaning the first one can be configured to carry multiple vlans via subinterface configuration, while the layer2 port needs SVI's.

To configure ip on switch module, you have to login to switch and create sub-interface on port 18 (connected to Gig1/0) and use port 17 as trunk, configure SVI interface and assign ip address.

configuration guide for 4451

http://www.cisco.com/c/en/us/td/docs/routers/access/interfaces/eesm/software/configuration/guide/4451_config.html#74902

Regards,

Akash