2V0-41.24 Question 129
Select 3An organization is leveraging VMware NSX-T Data Center to configure Equal-Cost Multi-Pathing (ECMP) for high availability and scalability across their network. During testing, the network team notices that traffic is not being distributed evenly across the available paths. What could be the possible reasons for this behavior?
- A
ECMP is not enabled on the Tier-0 Gateway.
- B
The hashing algorithm used for ECMP is not optimized for the traffic pattern.
- C
There are not enough physical NICs on the transport nodes to support ECMP.
- D
The uplinks of the Tier-1 Gateway are incorrectly configured for ECMP.
- E
The edge nodes are in active/standby mode instead of active/active mode.
Show answer and explanation
Correct answers: A, B, E
Explanation
For ECMP to operate correctly, it must be explicitly enabled on the Tier-0 Gateway, and the edge nodes must be in active/active mode to utilize multiple paths. Additionally, the hashing algorithm plays a key role in traffic distribution; if it is not optimized for the traffic pattern, uneven distribution may occur. Physical NICs and Tier-1 uplink configurations are not directly related to ECMP functionality.
- A. Correct.
If ECMP is not enabled on the Tier-0 Gateway, traffic will not be distributed across multiple paths as ECMP functionality will not be active. This is a valid reason for uneven traffic distribution.
- B. Correct.
The hashing algorithm determines how traffic is distributed across available paths. If it is not optimized for the specific traffic patterns, traffic may not be evenly balanced. This is a valid reason.
- C. Incorrect.
The number of physical NICs is not directly related to ECMP functionality. ECMP operates at the logical level and does not depend on the number of physical NICs. This is incorrect.
- D. Incorrect.
Tier-1 Gateways do not directly participate in ECMP for north-south traffic. ECMP is configured on Tier-0 Gateways, so this is not a valid reason.
- E. Correct.
In ECMP, the edge nodes must be in active/active mode to utilize multiple paths. If the edge nodes are in active/standby mode, traffic will only flow through the active node, causing uneven distribution. This is a valid reason.