Learn the correct set of commands to configure FCoE Unified Fabric with vPC between N9K-A and N9K-B to regulate bandwidth and avoid rate discards. Detailed explanation provided.
Table of Contents
Question
Refer to the exhibit.
An engineer implements an FCoE Unified Fabric where vPC exists between N9K-A and N9K-B. To avoid rate discards, bandwidth must be regulated to account for sent traffic that exceeds the access speed.
Which set of commands completes the configuration?
A. fcoe cost 255 on N9K-A
random-detect min 10 max 20
spanning-tree port type edge on Po10
B. fcoe cost 0 on N9K-A
shape min 0 gbps max 1 gbps
spanning-tree port type edge on Po1
C. fcoe fcf-priority 0 on N9K-A
hardware qos fc rate-shaper low
spanning-tree port type edge trunk on Po10
D. fcoe fcf-priority 255 on N9K-A
police 50000
spanning-tree port type edge trunk on Po1
Answer
The correct set of commands to complete the configuration and avoid rate discards is:
D. fcoe fcf-priority 255 on N9K-A
police 50000
spanning-tree port type edge trunk on Po1
Explanation
Setting the fcoe fcf-priority to 255 on N9K-A gives it the highest priority to become the Fibre Channel Forwarder (FCF). This ensures a deterministic FCF selection.
The “police 50000” command rate limits the traffic to 50 Mbps. This helps regulate bandwidth to account for sent traffic exceeding the access speed.
Configuring the spanning-tree port type as edge trunk on port-channel 1 (Po1) allows the port to transition directly to forwarding state. Po1 connects N9K-A to the FCoE device.
The other options are incorrect because:
- Option A sets an invalid fcoe cost and uses random-detect instead of policing
- Option B disables FCF priority by setting it to 0 and shapes traffic instead of policing
- Option C sets FCF priority to lowest and uses a rate-shaper instead of policing
In summary, the commands in Option D correctly set the FCF priority, police the rate to 50 Mbps, and configure the port type to regulate traffic and avoid rate discarding in this FCoE Unified Fabric with vPC scenario.
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