Implementing Cisco Application Centric Infrastructure (DCACI) — Question 331

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?

Answer options

• A. BPDU guard
• B. aggressive STP timers
• C. BPDU filtering
• D. STP type link shared

Correct answer: D

Explanation

The correct answer, D (STP type link shared), is appropriate because it allows better handling of multiple VLANs on shared links, which can help mitigate microloops. Options A, B, and C do not adequately address the problem of STP convergence issues leading to microloops in this scenario.