In this step you will replace the placeholder serial number for the border leaf switch with the actual serial number of the device.
This is required so that when you trigger POAP on the border leaf in this section, ND can identify the device and apply the correct configuration.
The placeholder serial number used in this lab is FGE20360RRX.
To find the actual serial number of your border leaf switch, you can check the label on the physical device or access the switch console and run the show version or show inventory chassis command.
In this lab example, the actual serial number of the border leaf switch is CONNECT_TIMEOUT that we're retrieving dynamically from CML.
To update the actual serial number, execute the following sed command in your VSCode terminal to replace the placeholder with the real serial number in the topology.nac.yml file.
sed -i '0,/FGE20360RRX/s//CONNECT_TIMEOUT/' ~/workspace/ndlab/nac/host_vars/site1-fabric/topology.nac.yml
You will onboard the border leaf switch site1-bl1 via POAP in the next section after updating your data model to include VRF-Lite configuration.
Continue to the next section to define external connectivity for your Site1 fabric and also manage an external fabric.