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From Andrija Panic <>
Subject Re: Advise on multiple PODs network design
Date Wed, 04 Oct 2017 20:19:43 GMT
Anyone?  I know I'm trying to squeeze some free paid consulting here :),
but trying to understand if PODs makes sense in this situation....


On 2 October 2017 at 10:21, Andrija Panic <> wrote:

> Hi guys,
> Sorry for long post below...
> I was wondering if someone could bring some light for me for multiple PODs
> networking design (L2 vs L3) - idea is to make smaller L2 broadcast domains
> (any other reason?)
> We might decide to transition from current single pod, single cluster
> (single zone) to multiple PODs design (or not...) - we will eventually grow
> to over 50 racks worth of KVM hosts (1000+ hosts) so Im trying to
> understand best options to avoid having insanely huge L2 broadcast
> domains...
> Mgmt network is routed between pods, that is clear.
> We have dedicated primary storage network and Secondary Storage networks
> (vlan interfaces configured locally on all KVM hosts, providing direct L2
> connection obviously, not shared with, and same for Public
> and Guest networks... (Advanced networking in zone, Vxlan used as isolation)
> Now with multiple PODs, since Public Network and Guest network is defined
> per Zone level (not POD level), and currently same zone-wide setup for
> Primary Storage... what would be the best way to make this traffic stay
> inside PODs as much as possible and is this possible at all? Perhaps I
> would need to look into multiple zones, not PODs.
> My humble conclusion, based on having all dedicated networks, is that I
> need to strech (L2 attach as vlan interface) primary and secondary storage
> network across all racks/PODs, and also need to strech Guest vlan (that
> carry all Guest VXLAN tunnels), and again same for Public Network...and
> this again makes huge broadcast domains and doesn't solve my issue...
> Don't see other option in my head to make networking work across PODs.
> Any suggestion is most welcome (and if of any use as info - we dont plan
> for any Xen, VmWare etc, will stay purely with KVM).
> Thanks
> Andrija


Andrija Panić

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