Adding VLAN into Vsphere environment

Dear Experts, we are using Vsphere 6.5 and there is only 1 VLAN for all VMs. Now we'd like to add more VLAN into the ESXi hosts. How can we do that? Many thanks!

- SAN storage HP MSA2040
- ESXi 6.5 Host: HP Gen9 server
- Core switch Cisco 3750
DP230Network AdministratorAsked:
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Omar SoudaniSenior System EngineerCommented:
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You first need to ensure the VLAN is configured on the physical switch. Those ports need to be connected/trunked to ESXi host (and vSwitch)

and then add that VLAN Tag number to a virtual machine portgroup.

Please note, that ESXi does not do any VLAN routing, e.g. routing traffic between VLANS, so that needs to be done on your network elsewhere

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DP230Network AdministratorAuthor Commented:
Hi Omar and Andrew, yes the VLAN and routing were already configured on Core switch. Currently our diagram like this:

ESXi host --------------- vlan 55 -------------- Core switch

As my understanding, you are suggesting us to add 1 more trunk cable like this, am I right?

ESXi host --------------- vlan 55 -------------- Core switch
ESXi host --------------- Trunk (vlan 15,25,35,...)  -------------- Core switch

In case I change the settings lile Omar's advise, is it right?
ESXi host --------------- Trunk (vlan 15,25,35,55,...) -------------- Core switch

If we add a port group of VLAN 15 and connection is remain in VLAN55, is it ok with the VM in VLAN55? If we configure the interface (on Switch side) from access mode vlan 55 to Trunk mode, does it affect the VMs? Do we need to change anything in ESXi host?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Make sure ALL vLANs are consistent on the trunk port and connected to two vmnics in host!

These vmnics are connected and active active to vSwitch

Then create your VM portgroups with correct tag and label

Then assign that vm portgroups to VMs via network interface per VM
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
And with ALL network changes it can affect VMs in production if not done correctly!

If unsure stop and complete changes outside service hours!
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