In this mode, UCS Fabric Interconnect is configured as a standard Ethernet switch with STP configured for loop avoidance. The up-link's ports are configured as forwarding or blocking as per the STP algorithm.

In order to verify or configure the switching mode for Fabric Interconnect, perform the following steps:

1. Log into UCS Manager.
2. Click on the Equipment tab in the navigation pane.
3. In the Equipment tab, click on Fabric Interconnect A (as shown in the following screenshot).

4. The Status area in the work pane shows the current Ethernet Mode configuration which is the switching mode.
5. In the Actions area of the work pane, the currently configured Ethernet Mode, which in this case is Switch, will be shown grayed:

A Fabric Interconnect reboot is required in order to change the Ethernet Mode from the Switch mode to the End Host mode and vice versa.

In order to change the Ethernet Mode from Switch to End Host, follow these steps:

1. Log into UCS Manager.
2. Click on the Equipment tab in the navigation pane.
3. In the Equipment tab, click on Fabric Interconnect A (as shown in the following screenshot).
4. In the Actions area of the work pane, the currently configured Ethernet Mode, which in this case is Switch, will be shown grayed and cannot be selected.
5. Click on Set Ethernet End-Host Mode in the Actions area of the work pane.
6. Click Yes on the pop-up warning message to restart Fabric Interconnect.

7. After Fabric Interconnect restarts, the Ethernet Mode is changed to the End Host mode.