Vmware Distributed Switch.

If I understand Distributed Switch can be used for many ESX Host while Standard Switch is on single host only.

That's not correct Standard and Distributed switches are functions of ALL hosts.

You would normally use Distributed switches when you start using larger environments, because it allows you to deploy the same configuration of switch DISTRIBUTED TO all Hosts in the Cluster, so all hosts have exactly the same network, apart from many other enterprise features, load balancing, LACP and many other functions that do not exist in Standard Switches.

With Standard Switches if you deploy to multiple ESXi hosts, you must ensure you have the same configuration, e.g. Virtual Machine Portgroups the same on all hosts, otherwise vMotion is going to fail.

1000 is the max for distributed switches.

With 300 hosts it would be wise and recommended to use Distributed Switch, but there are no VMweare police! that do not stop you doing standard switches per host.... but it's alot of work to maintain consistency across 300 hosts, but not impossible.

I thought Standard switches are by single Host  .. Example on HostA you can configure vSwitch1 , vSwitch2,, but  you cannot associate  the same vSwitch1 and vSwitch2 you created on HostA to HostB.
 
Alos, if I understand you comment above Distribution Switch can be by Cluster.. I mean you can have one Distribution Switch for all Hosts in the CLuster.

So if you have 2 Clusters , will you be able to configure Distribution Switch to all hosts in both clusters....? is it possible but not best practice or it is impossible ?

Thanks

I thought Standard switches are by single Host  .. Example on HostA you can configure vSwitch1 , vSwitch2,, but  you cannot associate  the same vSwitch1 and vSwitch2 you created on HostA to HostB.

That is correct, but to say they are only Single Host is not accurate.

Alos, if I understand you comment above Distribution Switch can be by Cluster.. I mean you can have one Distribution Switch for all Hosts in the CLuster.

I was referring to, if you had many hosts, they would normally be in a cluster, but if you wish you can use Distributed Switches on single host! or two hosts, not in a cluster.

So if you have 2 Clusters , will you be able to configure Distribution Switch to all hosts in both clusters....? is it possible but not best practice or it is impossible ?

Possible, as you add distributed switches to a host. (hosts are in clusters).

you mean one Distribution Switch can span 2 Clusters ?

You create a vDS and then you add it to Hosts or Clusters. (hence the Distributed function).

I understand that....

if we have 300 Hosts... can we put them in one CLuster , create one vDS and associate the hosts with vDS.

My point is when do you need to create separate Clusters, separate vDS ?

We'll come back to design later..
Thank you