Cisco UCS Removing IOM Uplink Ports

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I have found a lot of articles on the internet about how to add Cisco UCS IOM uplinks to your interconnect, but I could not find any on removing. So I’ve decided to write this small post on the simple procedure of how to remove Cisco UCS IOM Uplink ports.

The list of steps below assumes you want to change from a 4-port uplink per IOM module to a 2-port uplink per IOM module.

1. First up set set your Chassis/FEX Discovery Policy to 2 Link and make sure your Link Grouping Preference is set to Port Channel. This is found when you click on the Equipment tab and click on Equipment on the left hand side.

Cisco UCS Discovery Policy
Cisco UCS Discovery Policy

2. In the Equipment Tab click on Fabric Interconnects – Fabric Interconnect A – Fixed Module – Ethernet Ports. Select the 2 ports that you wish to remove. They should have the server role assigned to them. Right click on one of the ports and select unconfigure, do this for the second port as well. When you have finished repeat the same for Fabric Interconnect B.

Cisco UCS port unconfigure
Cisco UCS port unconfigure

3. Final step is to re-acknowledge the chassis. A re-acknowledgement reboots all your blades in that chassis, so make sure they are shut down before doing this step. Under the Equipment tab click on equipment – chassis and then the chassis you wish to re-acknowledge. Right click the chassis and select re-acknowledge

Cisco UCS acknowledge chassis
Cisco UCS acknowledge chassis

 

4. Once the chassis has been re-acknowledged it will only be discovered by the 4 IOM ports connected (2 on IOM 1 and 2 on IOM 2 in the chassis). You can then remove the cable.

If you have removed the cable first without completing the steps above, it should not be a problem as long as you have the Link Grouping Policy set as port-channel already, as illustrated in step 1. Though you will see warnings on the ports that you unplugged, like below:

Cisco UCS iom
Cisco UCS IOM

You will then need to follow the steps above and unconfigure the ports followed by re-acknowledging the chassis. The ports in yellow will then be removed.

If you have any technical questions about this tutorial or any other tutorials on this site, please open a new thread in the forums and the community will be able to help you out.

Disclaimer:
All the tutorials included on this site are performed in a lab environment to simulate a real world production scenario. As everything is done to provide the most accurate steps to date, we take no responsibility if you implement any of these steps in a production environment.