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swaminathan
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Sun Jul 03, 2011 3:25 pm

Question on ESXi trunking and frames details

Tue Apr 24, 2018 12:51 pm

Hi,



I have posted the question from Vmware ESXi standpoint but it is more of networking stuff . That is why I posted here .Anybody please answer with the details in Cisco way

Vmware InterviewQuestionAnswer

https://postimg.cc/image/51qrhtyij/

Brief explanation of Above mentioned Scenario:

There are three VMs connected to vSwitch.
VM1 Mac Adress is AA
VM2 Mac Address is BB
VM3 Mac Address is CC

vmnic0 is uplink connected to Physical Switch Port ( Let’s say 0/1).
This Uplink Mac Address is XX.


The question here is


How Physical Switch will be processing VMs Packets coming from vSwitch and goes on Wire.

Answer:

1.Physical Switch will be masking all VMs MAC address with Uplink Mac Address(XX) ( similar to NAT implementation)
2.Virtual Switch will be masking all outgoing VMs MAC address with Uplink Mac Address
3.Physical Switch Will be learning VMs MAC address and updating MAC table with only VMs MAC address.
4.Physical Switch will having both VM MAC address and Uplink Mac Address in its MAC table


Any advice is highly appreciated!
Thanks & Regards

S.Swaminathan

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