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Planning Guide—Dell EMC VxRail 7.0 vSAN Stretched Cluster
Executive summary Overview Networking and latency
Layer 2 and Layer 3 support
Witness traffic separation
Supported geographical distances
Data site to data site network latency
Data site to data site bandwidth
Data site to witness network latency
Data site to witness network bandwidth
Intersite MTU consistency
Connectivity
Appendix A: VxRail stretched cluster setup checklist Appendix B: VxRail stretched cluster open port requirements

Layer 2 and Layer 3 support

Layer 2 and Layer 3 support

  • Both Layer 2 and Layer 3 support vSAN connectivity between data nodes. Layer 2 does not require a static route, but Layer 3 does.

    Using Layer 3 is recommended for connectivity between the data sites and the witness. Witness Traffic Separation (WTS) can be used with Stretched Cluster configurations under the following conditions:

    • If a VMkernel interface other than the Management VMkernel interface is tagged with "witness" traffic, static routes are required to communicate with the vSAN Witness Host VMkernel interface tagged for vSAN Traffic.
    • If the Management VMkernel interface is tagged with "witness" traffic, static routes are not required if the host can already communicate with the vSAN Witness Host VMkernel interface using the default gateway.

    MTU can be different. For instance, MTU of 9000 between data nodes, MTU of 1500 between data nodes and the witness.