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Accepted
Andrew
Asked: 2013-12-05 19:13:40 +0800 CST

VMWare vSwitch VLAN IDs and tagged/untagged ports

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Similar to this question:

What happens when a port is configured as ACCESS and is a part of VLAN 'X' and we get a packet of VLAN 'Y' on that port? Will the switch drop it or it will add a VLAN header 'X' and forward to the respective port/ports (Double VLAN tagging).

Suppose I have the a switch stack (HP/3COM A5120) with a port range configured as

  • Untagged: 1
  • Tagged: None
  • PVID: 1

connected to NICs on vSwitch0 has a local network set as VLAN 0. Traffic from that switch ends up on VLAN 1 inside the physical network and is routed correctly.

What will happen if I change the vSwitch VLAN ID to 1? Will the frames be dropped? Will they be double tagged? Will the tagging be stripped and the frames end up on VLAN 1?

I want to add another VM Port Group (VM network) to that vSwitch & a corresponding VLAN on the HP switch ports, but I'm wondering if I should explicitly assign the VLAN on the existing vSwitch port group first and whether doing so will break things.

vmware-esxi

1 Answers

  1. Best Answer

    I found the following from the product manuals:

    enter image description here

    This doesn't seem to match the behaviour I observed (frames were being dropped), so I've ended up using a trunk port instead and making sure the VLAN I'm using on my vSwitch is permitted on the trunk port.

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