VM network Properties

Posted on 2014-08-28
Last Modified: 2014-08-28
Hello Experts,

 I wanted to understand below concepts in VMWare networking
1). When we add port group to vSwitch which has 2 NIC's. Suppose if one of the NIC goes office , how VM will understand to switch to other NIC which is online (I am asking about the VM which had a connection to the NIC which went offline). Is there any function set ? Algorithm?

2).Active/Standby --> If we have defined this setting , will ESXi choose Standby automatically if Active adapter goes down? what happens if the Offline adapter comes back online ?WIll it act as standby or it will replace one of the adapter and become active adapter.

3). Do we have some tool which help us in monitoring the network traffice in VMWare ESXi host?


-Prashant Girennavar.
Question by:Prashant Girennavar
    LVL 117

    Accepted Solution

    1. The VM does not switch it, the hypervisor monitors the physical nics, and switches the ports. The VM is completely unaware of the upstream vSwitch configuration.

    2. Yes. it should switch back to the defined configuration.

    3. Yes, we use this

    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 from your VMs for free is causing network issues.

    It's available as a fanastic FREE download here.
    LVL 10

    Author Comment

    by:Prashant Girennavar
    That helps.


    -Prashant Girennavar.

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