On 2020-03-26 05:51, [email protected] wrote:
[email protected]
Sent: Tuesday, March 24, 2020 10:27 AM
Cisco SD-WAN doesn't use DMVPN, it uses OMP for control plane and
IPSec
for data plane.
Omar: Yes, by default you will have a full mesh of tunnels. It's easy
to build
Hub and Spoke topology if you want to. Often large organizations build
regional Hub and Spoke where you traverse a Hub to go to another
geographical region, such as EU to US etc.
Is that the case really?
When we were reviewing sd-wan solutions from a number of vendors last
year -my recollection is that hub and spoke or dual hub and spoke (but
not multi-hub and spoke) was their go to topology and most of them
didn't even considered full-mesh of tunnels between spoke sites until
I asked.
Yes. Full mesh is the default for Cisco. They do recommend changing
the default if your org has more than 50 sites (I believe that number's
right).
If you consider what sd-wan is selling, its MPLS like QOE over cheapo
Internet links - for which they need at least two (ideally more)
links, then the number of tunnels is going to be n(n-1)/2 times the
number of cheapo links to the spoke site.
Correct -- n is the number of transport links, not the number of
devices.
adam
-Brian
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