![]() In the next part of the VLAN vSwitch articles we will look in detail at the physical switch configuration. HP Procurve switches uses the words “ tagged“. On Cisco devices a port allowing tagged frames is called a “ trunk port“. If not the frame will be dropped at the switch level. When the ESXi host sends any 802.1Q tagged frame to the network the physical switch port must be correctly configured. The tag do consume 4 extra byte for each frame for the 802.1Q tag, but that is also negligible.) (The tagging action on outgoing frames is often offloaded by ESXi to the physical network adapter and by that is minimal in performance overhead. The VM is not involved in any tagging action and does not even know it takes place. If a virtual machine (on a portgroup with a VLAN id) sends a frame that should be delivered to something outside of the virtual switch the vmkernel will modify the frame and add the 802.1Q tag to the frame before sending it to the physical network through the vmnic1 uplink. The router could be either a physical or virtual, but the vSwitch itself has no 元 capabilities. The vmkernel could never lift a frame from one VLAN to another as frames from one specific Layer Two broadcast domain must be processed by a Layer Three router before entering a new VLAN. If two VMs are on the same vSwitch, but different portgroups with different VLANs the traffic must always be routed at some location. If however two VMs are on two different vSwitches on the same ESXi host the traffic must always hit the physical switches and return, even if the same VLAN id are on both vSwitches. To keep the traffic internally at the ESXi host the destination VM must be on the same vSwitch, but it could be located on another portgroup as the sender VM, as long as both portgroups has the same VLAN number configured. No tagging is needed either by the VM or the vmkernel. ![]() If a virtual machine sends a frame destinated to another VM on the same VLAN and on the same vSwitch the frame will be delivered untagged and unmodified. The virtual machines does not need to know which VLAN they are member of and the vSwitch will expect only untagged default sized frames incoming from the VMs. The most common and simple way is as above, in this example two portgroups and the VLAN id:s set to 100 and 200. The VLAN settings at ESXi vSwitches are very important to get configured correct to have a working and secure network.įor more information about the 802.1Q tag and how it actually modifies the frames see this article. There are multiple different way to configure VLAN tagging 802.1Q in VMware vSphere ESXi. How the 802.1Q tagging works for internal and external VLAN traffic in vSphere standard vSwitches and what “VLAN trunking / tagging” is. The VLAN tagging options with VMware vSwitches. ![]()
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