FCoE FC-Map Configuration to Prevent Cross-Fabric Talk
An engineer implements an environment with multiple traffic types on a consolidated I/O link between Cisco Nexus 9000 Series Switch and MDS 9000 Series Switch. The configuration must meet these requirements: • The unified I/O link must support LAN and SAN traffic. • A single, multipurpose Ethernet transport must be used. • The configuration must discard MAC addresses that are not part of the current fabric. • The QoS markings must be preserved. Which configuration set meets the requirements?
Community Votes
67% of anonymous learners picked answer D. Votes are pick records left by other test-takers — they are not the verified answer.
Community Insight
Configuring fcoe fcmap makes the switch discard MAC addresses not part of the current fabric; this is the FCoE fabric-isolation mechanism and works with the existing network-qos class for QoS.
On a converged Nexus link, fcoe fcmap sets the FC-Map that identifies the fabric and discards FCoE frames from foreign fabrics, preventing cross-fabric data corruption while preserving QoS.
Pointing at an fcip interface, a plain Ethernet interface, or a native MDS fc interface instead of the Nexus unified-link fcoe fcmap setting that performs fabric segregation.
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Expert Analysis
Why the Answer Is Correct
On a converged Nexus 9000 link carrying both LAN and SAN, configuringfcoe fcmap <value> sets the global FC-Map that identifies the Fibre Channel fabric for that switch. When the FC-Map is configured, the switch discards FCoE frames whose MAC addresses are not part of the current fabric, preventing cross-fabric data corruption. QoS markings on the Ethernet transport are preserved because FCoE uses the existing network-qos class.Why the Other Options Are Wrong
A. Anfcip interface is for FCIP tunneling over IP, unrelated to fabric isolation on a unified link. B. A plain Ethernet interface (Eth2) does not enforce FC-Map-based fabric segregation. C. An fc interface on the MDS is a native Fibre Channel port, not the FCoE unified-link FC-Map setting.