Refer to the exhibit. An engineer is deploying a Cisco ACI environment but experiences a STP loop between SW1 and SW2. Which configuration step is needed to break the STP loop?
A.
Configure a Layer 2 external bridged network on the interfaces facing the MST switches.
B.
Enable the native VLAN on the interfaces facing the MST switches using static ports in a dedicated EPG.
C.
Enable BPDU filter under the STP interface policy on the interfaces facing the MST switches.
D.
Configure the STP instance to VLAN mapping under the switch STP policy.
BPDU frames in MST are sent on the Native Vlan (these are sent untagged), and not on a per-vlan basis as is the case with RPVST and PVST. This means we will have to make configuration specifically to accommodate for these differences in the ACI Fabric.
To deal with the untagged MST BPDUs, you’ll need to configure a couple of things differently than what you do when dealing with RPVST or PVST.
Create a Switch Policy Group for your MST region – Under Fabric Access Policies, you’ll need to create a Switch Policy Group (note – I’m not talking about Interface Policy Groups). For this Policy Group, you’ll create a Spanning-tree policy and add in information about your MST region.
Native Vlan EPG – For ACI, in your Tenant where you Layer-2 connection resides, you will need to create a specific EPG to carry the MST BPDUs. The static path bindings for your Legacy switches will be configured as dot1p (native). Failure to do this could very likely result in a loop.
This should be B&D. BPDU Filter is not helping when it is MST. With MST BPDU are blocked when entering the fabric because they are sent on native vlan. You need to map EPG to native vlan on all ports facing MST switches. And also map vlans to MST instance..
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