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vLan Tagging concept in VMWare

Posted on 2014-09-29
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Last Modified: 2014-09-30
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
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Question by:Prashant Girennavar
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6 Comments
 
LVL 119
ID: 40350125
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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LVL 10

Author Comment

by:Prashant Girennavar
ID: 40351503
Got it...

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

-Prashant Girennavar.
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LVL 119

Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 40351617
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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LVL 10

Author Comment

by:Prashant Girennavar
ID: 40351690
Thank you :)
0
 
LVL 10

Author Comment

by:Prashant Girennavar
ID: 40351692
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.
0
 
LVL 119
ID: 40351721
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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