Refer to the exhibit. How are the STP BPDUs forwarded over Cisco ACI fabric?

Question

Exhibit

Options

• ACisco ACI acts as the STP root for all three external switches.
• BSTP BPDUs that are generated by Switch2 are received by Switch1 and Switch3.
• CSTP BPDUs that are generated by Switch1 are received only by Switch3.
• DCisco ACI fabric drops all STP BPDUs that are generated by the external switches.

• A
  4% (2)
• B
  71% (37)
• C
  8% (4)
• D
  17% (9)

Explanation

In a Cisco ACI fabric, Spanning Tree Protocol (STP) Bridge Protocol Data Units (BPDUs) that are generated by an external switch, such as Switch2 in this scenario, are indeed forwarded across the fabric. This allows externally connected switches to maintain a loop-free topology. While Cisco ACI does not participate in STP as it uses its own protocols and mechanisms for loop prevention within the fabric, it will forward STP BPDUs across End Point Groups (EPGs) on which they are received1. This ensures that the connected external switches can still use STP for their loop prevention mechanisms.

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