Since ACI release 3.1(1) it’s now 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 10G Leafs.
Currently the following Leafs support the conversion:
- N9K-C93180LC-EX and N9K-C93180YC-FX
- N9K-93180YC-EX, N9K-C93180YC-EX, and N9K-C93180YC-EXU
- N9K-C93108TC-EX and 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.