For troubleshooting connectivity issues, it is also necessary to look into the status of the Fabric Interconnect ports where the IOM fabric ports are connected. These Fabric Interconnect ports are configured as Server ports.

Perform the following procedure to have a look at IOM backplane and fabric ports:

1. Log in to UCS Manager.
2. Click on the Equipment tab in the navigation pane.
3. In the Equipment tab, expand the desired Fabric Interconnects.
4. Change the General tab to the Ethernet Ports module, and Overall Status of the backplane and fabric ports will be shown in the work pane.
5. In the Filter bar, uncheck All and check the Server checkbox to display server ports only. The port's status and any adapter errors on that server port will be displayed on the screen as shown in the following screenshot:

If there are some errors, the Overall Status tab in the work pane will indicate the issue: for example, link-down in case of a physical SFP failure.