What are the vSphere components must be on the same subnet?

VSphere components, those who need to be on the same subnet / vLAN?

For example:

vCenter Server and ESXi hosts?

Groups separated from ESXi hosts are on separate VLANS / subnets? What is the limit of the number of hosts ESXi I should have on one vLAN to avoid having too much broadcast traffic?

vCenter Server and he associated with SQL Server?

VMware Update Manager and vCenter Server?

VMware Update Manager and ESXi hosts it updated?

There is no technical requirement that vSphere components must be on the same IP subnet. You can have all the components on a separate and routed (or even a firewall, you implement granted sufficient rules) subnet without problems. If that made sense, however, is a completely different question.

vCenter Server and ESXi hosts?

Does not really matter, but makes the most sense to be on the same subnet.

Groups separated from ESXi hosts are on separate VLANS / subnets? What is the limit of the number of hosts ESXi I should have on one vLAN to avoid having too much broadcast traffic?

If they are managed by the same vCenter, or similar commercial purposes, I would put them on the same subnet. I only consider something a subnet extra for things like DMZ-Clusters, that can be distinguished from any other as much as possible. A vMotion VLAN cluster might be a correct point in a normal scenario too.

ESXi hosts really do not generate any significant broadcast traffic, apart from a few ARP requests here and there. This isn't Windows, after all, and even if that were the case, the time when you had to worry about the reasons broadcasting with 'only' a few hundreds or thousands of systems on a broadcast domain have long been more with the advent of fast and gigabit ethernet.

vCenter Server and he associated with SQL Server?

VMware Update Manager and vCenter Server?

Even once it does not really matter, but I would put them on the same subnet unless I have a very good reason not to.

VMware Update Manager and ESXi hosts it updated?

As long as they are not connected via a WAN snail, causing the staging of updates hours, that's fine.

Tags: VMware

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