2V0-622 · Question #59
Which three statements are correct regarding Fibre Channel over Ethernet (FCOE)? (Choose three.)
The correct answer is A. The network switch must have Priority-based Flow Control (PFC) set to AUTO. D. Each port on the FCoE card must reside on a separate vSwitch. E. The ESXi host will require a reboot after moving an FCoE card to a different vSwitch. FCoE in vSphere requires PFC set to AUTO on the switch, each FCoE NIC port on a separate vSwitch, and a host reboot when moving FCoE adapters between vSwitches.
Question
Which three statements are correct regarding Fibre Channel over Ethernet (FCOE)? (Choose three.)
Options
- AThe network switch must have Priority-based Flow Control (PFC) set to AUTO.
- BThe network switch must have Priority-based Flow Control (PFC) set to ON.
- CEach port on the FCoE card must reside on the same vSwitch.
- DEach port on the FCoE card must reside on a separate vSwitch.
- EThe ESXi host will require a reboot after moving an FCoE card to a different vSwitch.
How the community answered
(46 responses)- A85% (39)
- B11% (5)
- C4% (2)
Why each option
FCoE in vSphere requires PFC set to AUTO on the switch, each FCoE NIC port on a separate vSwitch, and a host reboot when moving FCoE adapters between vSwitches.
VMware requires Priority-based Flow Control to be set to AUTO on the physical switch port to allow lossless Ethernet for FCoE traffic; this enables the switch and adapter to negotiate flow control settings dynamically.
Setting PFC to ON (forced/always-on) is not the VMware-recommended configuration for FCoE switch ports; AUTO is required to allow proper negotiation.
Placing all FCoE ports on the same vSwitch violates the isolation requirement - each port must reside on a separate vSwitch to correctly segment converged traffic.
Each physical port on an FCoE converged network adapter must be assigned to its own separate vSwitch to maintain network isolation and proper traffic separation between storage and network paths.
Changes to vSwitch assignment for FCoE adapters require a host reboot to take effect because the FCoE software initiator binds to the vSwitch at boot time and cannot be dynamically reattached.
Concept tested: FCoE switch and vSwitch configuration requirements
Source: https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.storage.doc/GUID-E8E39B3B-1C5C-4C41-9A9D-3E8D6E7F1B8E.html
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