Home » VMware » 2V0-621 v.2 » What is a likely cause?
An administrator notices that there is an all paths down (APD) event occurring for the software FCoE storage.
What is a likely cause?
A. Spanning Tree Protocol is enabled on the network ports.
B. Spanning Tree Protocol is disabled on the network ports.
C. Spanning Tree Protocol is enabled on the storage processors.
D. Spanning Tree Protocol is disabled on the storage processors.
Correct Answer: A
Explanation/Reference:
Explanation : Configuration Guidelines for Software FCoE
When setting up your network environment to work with ESXi software FCoE, follow the guidelines and best practices that VMware offers.
Network Switch Guidelines
Follow these guidelines when you configure a network switch for software FCoE environment:
On the ports that communicate with your ESXi host, disable the Spanning Tree Protocol (STP). Having the STP enabled might delay the FCoE Initialization
Protocol (FIP) response at the switch and cause an all paths down (APD) condition. The FIP is a protocol that FCoE uses to discover and initialize FCoE entities on the Ethernet.
Turn on Priority-based Flow Control (PFC) and set it to AUTO.
Make sure that you have a compatible firmware version on the FCoE switch.
Reference: https://pubs.vmware.com/vsphere-60/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-60-storage-guide.pdf
