Cisco ACI – Convert Leaf Ports (Uplink to Downlink)

How to convert the 40/100G Leaf Uplinks Port to Downliks. This allows you to connect end system to them.

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Since ACI release 3.1(1) it’s possible to use some of the Leaf Uplinks as Downlink Ports. This could help you out if there is a need for some 40/100G ports but you are currently only running 10/25G Leafs.
Currently the following Leafs support the conversion:

  • N9K-C9348GC-FXP
  • N9K-C93180LC-EX
  • N9K-C93180YC-FX
  • N9K-C93180YC-EX and N9K-C93180YC-EXU
  • N9K-C93108TC-EX
  • N9K-C93108TC-FX
  • N9K-C9336C-FX2 (only downlink to uplink conversion supported)

There are some limitations, check them out on the Cisco Page.

Our use case was to use some of the 40/100G Ports as Downlinks on a N9K-C93180YC-FX. The main limitation there is that the last 2 ports (53 and 54) don’t support conversion, no issue if you use them as Uplinks anyway.

The conversion process is pretty straight forward.
Head to Fabric -> Inventory, open up the respective POD and select your Leaf.

Overview of a leaf

Go to the “Interface” tab and change the mode to “Configuration”

Interface overview of a leaf

Now select the port you want to change from uplink to downlink and then select “Downlink”.

Change the port type

There will be a popup with the information about the change, “Submit” it.

Submit dialog

And that’s it, repeat for all the other interfaces you want to convert. Then reload the Leaf.

Reboot the leaf

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