The Spanning Tree Interface Policy defines a common configuration that is configured globally and can be deployed to one or multiple interfaces. Because uplinks from the MX network and external FSE switches do not have Spanning Tree Protocol (STP) enabled, this is optional but the STP policy on APIC acts as an extra layer of protection against possible STP issues.
Note: Enabling the Spanning Tree Interface Policy is not required; however it is recommended.
To create a Spanning Tree Interface Policy, perform the following steps:
Go to Fabric > Access Policies > Policies > Interface > Spanning Tree Interface.
Right-click Spanning Tree Interface and select Create Spanning Tree Interface Policy.
In the Name field, enter ACI-STP.
From the Interface Controls option, check the BPDU filter enabled and BPDU Guard enabled boxes.