350-601 Storage Network Practice Question
A large data center uses a Cisco Nexus 9000 switch with FCoE NPV feature. The switch is connected to an MDS 9700 upstream. The network team recently replaced the MDS 9700 with a new one. After the replacement, the FCoE hosts are unable to log in to the storage fabric. The Nexus switch shows that the FCoE NPV uplinks are up but no FLOGIs are being forwarded. The show npv flogi-table on the Nexus is empty. The upstream MDS shows that the uplinks are in VSAN 100, and the zoning is correct. The Nexus switch configuration includes 'feature npv' and 'npv enable' on the relevant interfaces. The FCoE VLAN 100 is mapped to VSAN 100. What is the most likely cause?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The upstream MDS is not configured to accept NPV connections
The most likely cause is that the upstream MDS is not configured to accept NPV connections. For NPV to work, the upstream switch (MDS) must have NPIV enabled on the uplink interfaces. Without NPIV, the MDS will reject FLOGI requests from the Nexus. Other options: FKA-adv-period affects keep-alives, not login; FIP snooping is on the Nexus but would not cause empty flogi-table if uplinks are up; VLAN mapping is correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The upstream MDS is not configured to accept NPV connections
Why this is correct
The MDS needs NPIV enabled on the uplink interfaces to proxy FLOGIs from the Nexus.
- ✗
The FIP snooping policy is blocking the FLOGI traffic
Why it's wrong here
FIP snooping filters on the Nexus, but if policy were blocking, the uplinks might show errors, not just empty flogi-table.
- ✗
The Nexus switch is missing the 'fcoe fka-adv-period' configuration
Why it's wrong here
This parameter affects keep-alive intervals, not initial login.
- ✗
The FCoE hosts are not in the same VLAN as the FCoE NPV uplinks
Why it's wrong here
VLAN mapping is correct, so this is unlikely.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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