You have an external switch that runs STP An interface connected to the switch generates a loop_ inc error Wh.ch feature do you enable on the Cisco ACI fabric to resolve the issue?

LACP (Link Aggregation Control Protocol) is used for bundling multiple physical links into a single logical link, not for resolving STP loop errors.

MSTP (Multiple Spanning Tree Protocol) is an enhanced version of STP; enabling it would involve running another STP instance, not stopping STP-related errors from an external switch.

Enabling the BPDU filter on ACI interfaces prevents them from sending or receiving Bridge Protocol Data Units (BPDUs), effectively isolating the ACI fabric from the external STP domain. This stops the external switch from detecting loops within the ACI fabric and resolves loop-inc errors by ensuring STP only operates where intended.

PortFast immediately transitions a port to the forwarding state, typically for end-device ports, and does not address the issue of an external switch detecting loops through the ACI fabric.