VMware NSX

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  • 1.  VXLAN VLAN across racks?

    Posted May 09, 2016 07:20 PM

    I was reading the design guide for NSX and in there it was mentioned that the VXLAN VLAN ID on a vDS has to be the same across all racks in a given DC. VLAN ID for Mgmt, Storage and vMotion can differ; however the VXLAN VLAN ID has to be consistent. Can someone explain why that is?

    Thanks!



  • 2.  RE: VXLAN VLAN across racks?

    Posted May 09, 2016 08:43 PM

    ‌The vSphere Distributed Switch can only support one VXLAN transport/VTEP VMkernel port. You therefore need to use the same VLAN ID globally across the environment (although you can back each occurrence with a different IP subnet) or use a separate VDS. In the latter scenario you will get dvPortgroups created across ALL the VDSs that back the hosts in your Transport Zone when you create a Logical Switch but each will be tagged with the associated VLAN ID. If you use one VDS you're restricted to a single dvPortgroup and therefore a single VLAN tag.