Hi Guruchanran,

Thanks for your work!

On Wed, Oct 21, 2015 at 2:53 PM, Gurucharan Shetty <shet...@nicira.com>
wrote:

>
> +
> +OVN provides network virtualization to containers.  OVN's integration with
> +Kubernetes works in two modes - the "underlay" mode or the "overlay" mode.
> +
>

Could you help briefly describe what are the scenario, pros & cons of each
mode?


>
> +We then create 2^(32-x) logical ports for that logical switch (with the
> parent
> +port being the VIF_ID of the hosting VM).  On the worker node, for each
> +logical port we write data into the local Open vSwitch database to
> +act as a cache of ip address, its associated mac address and port uuid.
> +
> +The value 'x' chosen depends on the number of CPUs and memory available
> +in the VM.
>

Well, this 'x' might be hard to pre-define. We might have to end up with
reserving big enough subnets for a host to be able to host small pods. But
that would mean waste of IP space.
Of course it is not an issue in deployments where IP space is adequate.


> +Since one of the k8 requirements is that each pod in a cluster is able to
> +talk to every other pod in the cluster via IP address, the above
> architecture
> +with interconnected logical switches via a logical router acts as the
>

This ideal sounds good. But I have a concern about the scalability. For
example, 1000 logical switches (for 1000 hosts in a cluster) connects to a
single logical router. Would this scale?

Thanks,
Han
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