Q19
Single choice
As part of a migration, legacy non-ACI switches must be connected to the Cisco ACI fabric. All non-ACI switches run per-VLAN RSTP. After the non-ACI switches are connected to Cisco ACI, the STP convergence caused a microloop and significant CPU spike on all switches.
Which configuration on the interfaces of the external switches that face the Cisco ACI fabric resolves the problem?