vLan Tagging concept in VMWare

Hello Experts,

I need to understand VLan tagging concepts in VMware. I have gone through internet , but till now , i haven't got an clear understanding of it.

Lets consider below situation.

I have a a vSwitch 0 , which has got 3 port groups

1). Port group1 -- > 148 vLan tagged to it.
2). Port group 2--> 157 vLan tagged to it. (File and Print servers in this group)
3). Port group 3 -->192 VLAN tagged to it.

I have enabled trunk on my physical switch.

Question is:

Say for EG : I am accessing one of the file servers from my client machine(which is not part of any vlan) , how the traffic will be routed to 157 VLAN. how the network packets are tagged with VLAN and where it is tagged?

2), what happens in vSWITCH once it receive the tagged packet?

I will have more question once I receive an answer to it :)

Thanks,

-Prashant Girennavar
LVL 10
Prashant GirennavarAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
1. ALL traffic must be VLAN tagged with the correct VLAN to reach your server.

2. when it's received at the vSwitch is sent to the virtual machine portgroup with the matching VLAN tag.
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Prashant GirennavarAuthor Commented:
Got it...

One basic question , where this vLan will be tagged? at client systems?

-Prashant Girennavar.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Either in the OS, or it's configure on the port the Client is connected to!

e.g. it's an Access Port, in a specific VLAN
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Prashant GirennavarAuthor Commented:
Thank you :)
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Prashant GirennavarAuthor Commented:
Last query --  Do we have some tool , from which we can monitor the vSwitch traffic and find out what extactly going inside it?

Thanks,

-Prashant Girennavar.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
One of the biggest management holes in vCenter of ESX is the vSphere Client can indicate that VM network traffic is causing a 1 GB Ethernet adapter to have a 99% utilization rate. But strangely, it doesn't display which kind of traffic is going across the virtual networks, where it came from or where it's going.

To learn which traffic is going across a virtual network, there's another free tool for vSphere: Xangati for ESX, a virtual appliance that tracks conversations on the virtual network. It's great for troubleshooting any virtual network issue, analyzing virtual desktop infrastructure and correlating vCenter performance stats with virtual network stats.

and then you can really check what traffic  for free is causing network issues.

It's available as a fantastic FREE download here.

http://xangati.com/try-it-free/
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