Designing Cisco Data Center Infrastructure (DCID) — Question 80

A company has added a new FCoE storage array to increase the performance of datastore access for end users. This storage array is directly connected to the Cisco Nexus 5672UP switches using four 10G port-channel interfaces. After deployment, the end users fail to access the datastore compared to the older solution. A network engineer verified the port-channel interface and finds that the congestion occurs when PFC frames are generated at the FCoE ingress interface. Which action must be taken to resolve the congestion issue?

Answer options

• A. Reserve bandwidth for FCoE VLAN on the port-channel interface connected with storage.
• B. Enable the FCoE class in QoS on Cisco Nexus 5672UP switches.
• C. Increase the queuing buffer in the port-channel interface connected to the storage array.
• D. Add an additional FCoE VLAN to the SAN network.

Correct answer: C

Explanation

Increasing the queuing buffer in the port-channel interface (option C) will help to manage and alleviate congestion caused by PFC frames, improving access to the datastore. Options A and D do not directly address the congestion issue, while option B relates to QoS settings but does not resolve the immediate buffer limitations causing the performance problem.