VMware vSphere

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  • 1.  VLAN id 4095 on a portgroup?

    Posted Jan 19, 2011 09:50 PM

    What would be the meaning of setting VLAN id 4095 on a portgroup to a virtual machine?

    Would it be a port where all VLANs is forwarded to? If so, will the 802.1Q tag be left on the frame when delivered to the VM?



  • 2.  RE: VLAN id 4095 on a portgroup?
    Best Answer

    Broadcom Employee
    Posted Jan 19, 2011 09:57 PM

    That's correct, also know as VGT (Virtual Guest Tagging) where the VM will remove the VLAN tag vesus the vSwitch



  • 3.  RE: VLAN id 4095 on a portgroup?

    Posted Jan 19, 2011 10:02 PM

    Thanks for your quick reply!

    So if I have a vNIC with 802.1Q support I would be able to have the VLAN tagged all the way up to the VM?

    If I have a vSwitch with, say, three portgroups and the first one is VLAN 100, the second is VLAN 200 and the third is VLAN 4095. Would the third portgroup be a member of both 100 and 200?



  • 4.  RE: VLAN id 4095 on a portgroup?

    Broadcom Employee
    Posted Jan 20, 2011 03:01 AM

    Yep



  • 5.  RE: VLAN id 4095 on a portgroup?

    Posted Jan 20, 2011 06:45 AM

    Thanks, and finally - if I have the 4095 portgroup with Promiscuous Mode allowed and start e.g. Wireshark, then I would get ALL traffic from all other portgroups and all VLANs from the whole vSwitch?



  • 6.  RE: VLAN id 4095 on a portgroup?

    Posted Jan 20, 2011 07:27 AM

    Sorry, may i describe all the issues:

    1. the port that real NIC (physical nic) is connect must be "trunk".

    2. if u have a VM with 172.20.1.15 and the other is 172.20.4.20 and want both of them with one NIC and one port, u have two ways:

         first: to choose VLAN ID to "ALL (4095)"

         second: to create different Virtual switches which connect to one and set the vlan for each of one.

    these two solutions depend on the networking view, I mean the base of the Network+ and managing the network etc, broadcasting.

    Saman Salehi