Minimum MTU Requirements for VMware NSX-T Data Center

D.

VMware's recommendation for the minimum MTU (Maximum Transmission Unit) requirements when planning a NSX-T Data Center deployment is option D - MTU should be set to 1600 or greater across the data center network including inter-data center connections.

MTU refers to the largest size of the data packet that can be transmitted over a network. In the context of NSX-T Data Center, the MTU size is critical to ensure that the virtual overlay network created by NSX-T can function properly, as it relies on encapsulation of data packets.

Setting the MTU size to 1600 or greater across the data center network, including inter-data center connections, is recommended to allow sufficient room for encapsulation. This recommendation takes into account the overhead added by the VXLAN (Virtual Extensible LAN) encapsulation used in NSX-T.

Option A suggests setting the MTU to 1550 or less across the data center network, including inter-data center connections. This may not provide sufficient room for encapsulation, leading to fragmentation of packets and potentially impacting network performance.

Option B suggests setting the MTU to 1500 or less only on inter-data center connections. While this may reduce the likelihood of fragmentation on inter-data center connections, it does not address the potential for fragmentation on other parts of the network.

Option C suggests configuring Path MTU Discovery (PMTUD) and relying on fragmentation. While PMTUD can help avoid fragmentation by dynamically adjusting the MTU size, relying on fragmentation can still impact network performance and increase the risk of packet loss.

In summary, setting the MTU to 1600 or greater across the data center network, including inter-data center connections, is VMware's recommended approach for NSX-T Data Center deployments to ensure optimal network performance and avoid potential issues related to packet fragmentation.