How to Configure DLB on Nexus 9000 for Specific Interfaces?

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An engineer must configure dynamic load balancing (DLB) on a Cisco Nexus 9000 Series Switch AI fabric using a CLI. Which configuration must be implemented for only the odd-numbered interfaces?

  1. Under the relevant interface-level configuration, add the keyword dlb-interface.
  2. Create a QoS policy that enables DLB and apply that policy to the relevant interfaces.
  3. Create a DLB hardware profile and include the list of desired interfaces. Correct Answer
  4. Exclude the desired interfaces from DLB with the interface level configuration of no dlb-interface.
Answer Correct answer: C — Create a DLB hardware profile and include the list of desired interfaces.

Community Insight

DLB on Nexus 9000 is configured globally via a hardware profile, not at the individual interface level, making the enumeration of specific interfaces under the profile the correct approach.

Configuring Dynamic Load Balancing (DLB) on a Cisco Nexus 9000 Series Switch requires defining a hardware profile and specifying the participating interfaces. This guide confirms the correct CLI method to enable DLB for only odd-numbered interfaces.

Attempting to configure DLB directly under interface-level configuration (Option A) because it seems logical for per-interface settings, but DLB relies on a global hardware profile.

Community Discussion (1 comments)

Gharet 👍 1 Selected: C
The answer is C. Create a DLB hardware profile and include the list of desired interfaces. On Nexus 9000 NX-OS, DLB is configured globally via hardware profile dlb, and the participating interfaces are enumerated under that profile with dlb-interface statements (plus mode flowlet/per-packet settings).

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Expert Analysis

Why the Answer Is Correct

On Cisco Nexus 9000 Series Switches running NX-OS, Dynamic Load Balancing (DLB) is not configured directly on individual interfaces. Instead, it is configured globally using a hardware profile (hardware profile dlb). Under this profile, the engineer enumerates the specific interfaces that will participate in DLB using the dlb-interface command. Therefore, to apply DLB to only odd-numbered interfaces, the engineer must create the DLB hardware profile and explicitly list those desired interfaces within it.

Why the Other Options Are Wrong

Option A is incorrect because DLB configuration does not occur under interface-level configuration mode. Option B is incorrect because DLB is a hardware profile feature for load balancing traffic across port channels or ECMP, not a QoS policy. Option D is incorrect because there is no interface-level no dlb-interface command used to exclude interfaces from a global feature; the inclusion or exclusion is handled within the hardware profile itself.

Community Comment Notes

As Gharet noted, "DLB is configured globally via hardware profile dlb, and the participating interfaces are enumerated under that profile". This directly refutes the idea of using interface-level configuration and validates the hardware profile approach.

Exam Strategy

For Nexus 9000 AI fabric configurations, remember that hardware-level optimizations like DLB are typically configured globally via hardware profiles rather than individual interface configurations. Always look for the global configuration context when dealing with fabric-wide load balancing features.

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