A network engineer is configuring a Cisco MDS switch for FCoE. Which two conditions must be considered during the implementation phase? (Choose two.)

When implementing Fibre Channel over Ethernet (FCoE) on Cisco MDS switches, ensuring consistent network behavior and proper frame handling is critical. The Data Center Bridging (DCB) extensions, which provide the lossless fabric for FCoE, require that the Quality of Service (QoS) policy for FCoE traffic is identical across all participating switches to prevent traffic drops. Additionally, a specific MTU setting must be considered: while the interface jumbo MTU must be at least 2158 bytes, the system-level MTU for the FCoE traffic class defaults to, and must be set to, 2112 bytes. This value corresponds to the maximum size of a Fibre Channel frame payload.

A. System-defined objects, including class maps like class-fcoe, are protected in Cisco NX-OS and cannot be modified or deleted.
D. Cisco's FCoE implementation explicitly prohibits mapping an FCoE VSAN to VLAN 1 or any native VLAN to avoid conflicts with control and untagged traffic.
E. FCoE is not enabled by default on Cisco MDS switches. It requires the installation of a specific license and manual enablement of the feature fcoe.

1. Cisco MDS 9000 Series FCoE Configuration Guide, NX-OS Release 8.x, "FCoE and DCB Configuration Guidelines and Limitations" section:

This document states, "You must set the system class FCoE MTU to 2112 on all switches in the network. This is the default." This directly supports option C.

It also states, "Ensure that the DCB configuration is identical on all switches in the network." This supports the principle in option B.

The guide specifies, "The FCoE VLAN cannot be VLAN 1 or the native VLAN." This proves option D is incorrect.

Under the "Enabling FCoE" section, it details that the feature must be licensed and then enabled with the feature fcoe command, proving option E is incorrect.

2. Cisco MDS 9000 Series NX-OS Quality of Service Configuration Guide, Release 8.x, "About System-Defined Objects" section:

This guide states, "The switch provides a set of system-defined QoS objects, including class maps, and policy maps... You cannot modify or delete the system-defined objects." This proves option A is incorrect.