<s>
A	O
software-defined	B-Architecture
wide	I-Architecture
area	I-Architecture
network	I-Architecture
(	O
SD-WAN	B-Architecture
)	O
is	O
a	O
wide	O
area	O
network	O
that	O
uses	O
software-defined	O
network	O
technology	O
,	O
such	O
as	O
communicating	O
over	O
the	O
Internet	O
using	O
overlay	O
tunnels	B-Protocol
which	O
are	O
encrypted	O
when	O
destined	O
for	O
internal	O
organization	O
locations	O
.	O
</s>
<s>
If	O
standard	O
tunnel	O
setup	O
and	O
configuration	O
messages	O
are	O
supported	O
by	O
all	O
of	O
the	O
network	O
hardware	O
vendors	O
,	O
SD-WAN	B-Architecture
simplifies	O
the	O
management	O
and	O
operation	O
of	O
a	O
WAN	O
by	O
decoupling	O
the	O
networking	O
hardware	O
from	O
its	O
control	O
mechanism	O
.	O
</s>
<s>
This	O
concept	O
is	O
similar	O
to	O
how	O
software-defined	O
networking	O
implements	O
virtualization	B-General_Concept
technology	O
to	O
improve	O
data	B-Operating_System
center	I-Operating_System
management	O
and	O
operation	O
.	O
</s>
<s>
In	O
practice	O
,	O
proprietary	O
protocols	O
are	O
used	O
to	O
set	O
up	O
and	O
manage	O
an	O
SD-WAN	B-Architecture
,	O
meaning	O
there	O
is	O
no	O
decoupling	O
of	O
the	O
hardware	O
and	O
its	O
control	O
mechanism	O
.	O
</s>
<s>
A	O
key	O
application	O
of	O
SD-WAN	B-Architecture
is	O
to	O
allow	O
companies	O
to	O
build	O
higher-performance	O
WANs	O
using	O
lower-cost	O
and	O
commercially	O
available	O
Internet	O
access	O
,	O
enabling	O
businesses	O
to	O
partially	O
or	O
wholly	O
replace	O
more	O
expensive	O
private	O
WAN	O
connection	O
technologies	O
such	O
as	O
MPLS	B-Protocol
.	O
</s>
<s>
When	O
SD-WAN	B-Architecture
traffic	O
is	O
carried	O
over	O
the	O
Internet	O
,	O
there	O
are	O
no	O
end-to-end	O
performance	O
guarantees	O
.	O
</s>
<s>
Carrier	O
MPLS	B-Protocol
VPN	B-Application
WAN	O
services	O
are	O
not	O
carried	O
as	O
Internet	O
traffic	O
,	O
but	O
rather	O
over	O
carefully-controlled	O
carrier	O
capacity	O
,	O
and	O
do	O
come	O
with	O
an	O
end-to-end	O
performance	O
guarantee	O
.	O
</s>
<s>
Innovations	O
like	O
circuit	O
and	O
packet	O
switching	O
(	O
in	O
the	O
form	O
of	O
X.25	B-Protocol
,	O
ATM	O
and	O
later	O
Internet	B-Protocol
Protocol	I-Protocol
or	O
Multiprotocol	B-Protocol
Label	I-Protocol
Switching	I-Protocol
communications	O
)	O
allowed	O
communication	O
to	O
become	O
more	O
dynamic	O
,	O
supporting	O
ever-growing	O
networks	O
.	O
</s>
<s>
SD-WAN	B-Architecture
combines	O
several	O
technologies	O
to	O
create	O
full-fledged	O
private	O
networks	O
,	O
with	O
the	O
ability	O
to	O
dynamically	O
share	O
network	O
bandwidth	O
across	O
the	O
connection	O
points	O
.	O
</s>
<s>
Additional	O
enhancements	O
include	O
central	O
controllers	O
,	O
zero-touch	O
provisioning	O
,	O
integrated	O
analytics	O
and	O
on-demand	O
circuit	O
provisioning	O
,	O
with	O
some	O
network	O
intelligence	O
based	O
in	B-Architecture
the	I-Architecture
cloud	I-Architecture
,	O
allowing	O
centralized	O
policy	O
management	O
and	O
security	O
.	O
</s>
<s>
Networking	O
publications	O
started	O
using	O
the	O
term	O
SD-WAN	B-Architecture
to	O
describe	O
this	O
new	O
networking	O
trend	O
as	O
early	O
as	O
2014	O
.	O
</s>
<s>
With	O
the	O
rapid	O
shift	O
to	O
remote	O
work	O
as	O
a	O
result	O
of	O
lockdowns	O
and	O
stay	O
at	O
home	O
orders	O
during	O
the	O
COVID-19	O
pandemic	O
,	O
SD-WAN	B-Architecture
grew	O
in	O
popularity	O
as	O
a	O
way	O
of	O
connecting	O
remote	O
workers	O
.	O
</s>
<s>
WANs	O
allow	O
companies	O
to	O
extend	O
their	O
computer	O
networks	O
over	O
large	O
distances	O
,	O
connecting	O
remote	O
branch	O
offices	O
to	O
data	B-Operating_System
centers	I-Operating_System
and	O
to	O
each	O
other	O
,	O
and	O
delivering	O
applications	O
and	O
services	O
required	O
to	O
perform	O
business	O
functions	O
.	O
</s>
<s>
Due	O
to	O
the	O
physical	O
constraints	O
imposed	O
by	O
the	O
propagation	O
time	O
over	O
large	O
distances	O
,	O
and	O
the	O
need	O
to	O
integrate	O
multiple	O
service	O
providers	O
to	O
cover	O
global	O
geographies	O
(	O
often	O
crossing	O
nation	O
boundaries	O
)	O
,	O
WANs	O
face	O
important	O
operational	O
challenges	O
,	O
including	O
network	B-Protocol
congestion	I-Protocol
,	O
packet	B-Architecture
delay	I-Architecture
variation	I-Architecture
,	O
packet	B-Protocol
loss	I-Protocol
,	O
and	O
even	O
service	O
outages	O
.	O
</s>
<s>
Modern	O
applications	O
such	O
as	O
VoIP	B-Application
calling	O
,	O
videoconferencing	B-Application
,	O
streaming	O
media	O
,	O
and	O
virtualized	B-General_Concept
applications	O
and	O
desktops	B-Protocol
require	O
low	O
latency	O
.	O
</s>
<s>
SD-WAN	B-Architecture
products	O
are	O
designed	O
to	O
address	O
these	O
network	O
problems	O
.	O
</s>
<s>
By	O
enhancing	O
or	O
even	O
replacing	O
traditional	O
branch	O
routers	B-Protocol
with	O
virtualization	B-General_Concept
appliances	O
that	O
can	O
control	O
application-level	O
policies	O
and	O
offer	O
a	O
network	O
overlay	O
,	O
less	O
expensive	O
consumer-grade	O
Internet	O
links	O
can	O
act	O
more	O
like	O
a	O
dedicated	O
circuit	O
.	O
</s>
<s>
SD-WAN	B-Architecture
products	O
can	O
be	O
physical	O
appliances	O
or	O
software	O
based	O
only	O
.	O
</s>
<s>
The	O
MEF	O
Forum	O
has	O
defined	O
an	O
SD-WAN	B-Architecture
architecture	O
consisting	O
of	O
an	O
SD-WAN	B-Architecture
Edge	B-Device
,	O
SD-WAN	B-Architecture
Gateway	O
,	O
SD-WAN	B-Architecture
Controller	O
and	O
SD-WAN	B-Architecture
Orchestrator	O
.	O
</s>
<s>
The	O
SD-WAN	B-Architecture
Edge	B-Device
is	O
a	O
physical	O
or	O
virtual	O
network	O
function	O
that	O
is	O
placed	O
at	O
an	O
organization	O
's	O
branch/regional/central	O
office	O
site	O
,	O
data	B-Operating_System
center	I-Operating_System
,	O
and	O
in	O
public	O
or	O
private	O
cloud	B-Architecture
platforms	O
.	O
</s>
<s>
MEF	O
Forum	O
has	O
published	O
the	O
first	O
SD-WAN	B-Architecture
service	O
standard	O
,	O
MEF	O
70	O
which	O
defines	O
the	O
fundamental	O
characteristics	O
of	O
an	O
SD-WAN	B-Architecture
service	O
plus	O
service	O
requirements	O
and	O
attributes	O
.	O
</s>
<s>
SD-WAN	B-Architecture
Gateways	O
provide	O
access	O
to	O
the	O
SD-WAN	B-Architecture
service	O
in	O
order	O
to	O
shorten	O
the	O
distance	O
to	O
cloud-based	B-Architecture
services	O
or	O
the	O
user	O
,	O
and	O
reduce	O
service	O
interruptions	O
.	O
</s>
<s>
A	O
distributed	O
network	O
of	O
gateways	O
may	O
be	O
included	O
in	O
an	O
SD-WAN	B-Architecture
service	O
by	O
the	O
vendor	O
or	O
setup	O
and	O
maintained	O
by	O
the	O
organization	O
using	O
the	O
service	O
.	O
</s>
<s>
By	O
sitting	O
outside	O
the	O
headquarters	O
in	B-Architecture
the	I-Architecture
cloud	I-Architecture
,	O
the	O
gateway	O
also	O
reduces	O
headquarters	O
traffic	O
.	O
</s>
<s>
The	O
SD-WAN	B-Architecture
Orchestrator	O
is	O
a	O
cloud	B-Architecture
hosted	O
or	O
on-premises	O
web	O
management	O
tool	O
that	O
allows	O
configuration	O
,	O
provisioning	O
and	O
other	O
functions	O
when	O
operating	O
an	O
SD-WAN	B-Architecture
.	O
</s>
<s>
The	O
SD-WAN	B-Architecture
Controller	O
functionality	O
,	O
which	O
can	O
be	O
placed	O
in	O
the	O
Orchestrator	O
or	O
in	O
an	O
SD-WAN	B-Architecture
Gateway	O
,	O
is	O
used	O
to	O
make	O
forwarding	O
decisions	O
for	O
application	O
flows	O
.	O
</s>
<s>
Per	O
MEF	O
70	O
,	O
the	O
SD-WAN	B-Architecture
Edge	B-Device
classifies	O
incoming	O
IP	O
packets	O
at	O
the	O
SD-WAN	B-Architecture
UNI	O
(	O
SD-WAN	B-Architecture
User	O
Network	O
Interface	O
)	O
,	O
determines	O
,	O
via	O
OSI	O
Layer	O
2	O
through	O
Layer	O
7	O
classification	O
,	O
which	O
application	O
flow	O
the	O
IP	O
packets	O
belong	O
to	O
,	O
and	O
then	O
applies	O
the	O
policies	O
to	O
block	O
the	O
application	O
flow	O
or	O
allow	O
the	O
application	O
flows	O
to	O
be	O
forwarded	O
based	O
on	O
the	O
availability	O
of	O
a	O
route	O
to	O
the	O
destination	O
SD-WAN	B-Architecture
UNI	O
on	O
a	O
remote	O
SD-WAN	B-Architecture
Edge	B-Device
.	O
</s>
<s>
Research	O
firm	O
Gartner	O
has	O
defined	O
an	O
SD-WAN	B-Architecture
as	O
having	O
four	O
required	O
characteristics	O
:	O
</s>
<s>
The	O
ability	O
to	O
support	O
multiple	O
connection	O
types	O
,	O
such	O
as	O
MPLS	B-Protocol
,	O
Last	O
Mile	O
Fiber	O
Optic	O
Network	O
or	O
through	O
high	O
speed	O
cellular	O
networks	O
e.g.	O
</s>
<s>
Features	O
of	O
SD-WANs	B-Architecture
include	O
resilience	O
,	O
quality	O
of	O
service	O
(	O
QoS	O
)	O
,	O
security	O
,	O
and	O
performance	O
,	O
with	O
flexible	O
deployment	O
options	O
;	O
simplified	O
administration	O
and	O
troubleshooting	O
;	O
and	O
online	O
traffic	O
engineering	O
.	O
</s>
<s>
A	O
resilient	O
SD-WAN	B-Architecture
reduces	O
network	O
downtime	O
.	O
</s>
<s>
SD-WAN	B-Architecture
technology	O
supports	O
quality	O
of	O
service	O
by	O
having	O
application	O
level	O
awareness	O
,	O
giving	O
bandwidth	O
priority	O
to	O
the	O
most	O
critical	O
applications	O
.	O
</s>
<s>
SD-WAN	B-Architecture
communication	O
is	O
usually	O
secured	O
using	O
IPsec	B-Protocol
,	O
a	O
staple	O
of	O
WAN	O
security	O
.	O
</s>
<s>
SD-WANs	B-Architecture
can	O
improve	O
application	O
delivery	O
using	O
caching	B-General_Concept
,	O
storing	O
recently	O
accessed	O
information	O
in	O
memory	O
to	O
speed	O
future	O
access	O
.	O
</s>
<s>
SD-WANs	B-Architecture
can	O
incorporate	O
Artificial	O
Intelligence	O
for	O
IT	O
Operations	O
(	O
AIOps	O
)	O
for	O
continuous	O
troubleshooting	O
and	O
fixes	O
to	O
network	O
issues	O
.	O
</s>
<s>
Most	O
SD-WAN	B-Architecture
products	O
are	O
available	O
as	O
pre-configured	O
appliances	O
,	O
placed	O
at	O
the	O
network	O
edge	B-Device
in	O
data	B-Operating_System
centers	I-Operating_System
,	O
branch	O
offices	O
and	O
other	O
remote	O
locations	O
.	O
</s>
<s>
There	O
are	O
also	O
virtual	O
appliances	O
that	O
can	O
work	O
on	O
existing	O
network	O
hardware	O
,	O
or	O
the	O
appliance	O
can	O
be	O
deployed	O
as	O
a	O
virtual	O
appliance	O
on	O
the	O
cloud	B-Architecture
in	O
environments	O
such	O
as	O
Amazon	O
Web	O
Services	O
(	O
AWS	O
)	O
,	O
Unified	O
Communications	O
as	O
a	O
service	O
(	O
UCaaS	O
)	O
or	O
as	O
Software	B-Architecture
as	I-Architecture
a	I-Architecture
Service	I-Architecture
(	O
SaaS	B-Architecture
)	O
.	O
</s>
<s>
This	O
allows	O
enterprises	O
to	O
benefit	O
from	O
SD-WAN	B-Architecture
services	O
as	O
they	O
migrate	O
application	O
delivery	O
from	O
corporate	O
servers	O
to	O
cloud	B-Architecture
based	O
services	O
such	O
as	O
Salesforce.com	B-Application
and	O
Google	B-Application
apps	O
.	O
</s>
<s>
As	O
with	O
network	O
equipment	O
in	O
general	O
,	O
GUIs	B-Application
may	O
be	O
preferred	O
to	O
command	B-Application
line	I-Application
interface	I-Application
(	O
CLI	O
)	O
methods	O
of	O
configuration	O
and	O
control	O
.	O
</s>
<s>
With	O
a	O
global	O
view	O
of	O
network	O
status	O
,	O
a	O
controller	O
that	O
manages	O
SD-WAN	B-Architecture
can	O
perform	O
careful	O
and	O
adaptive	O
traffic	O
engineering	O
by	O
assigning	O
new	O
transfer	O
requests	O
according	O
to	O
current	O
usage	O
of	O
resources	O
(	O
links	O
)	O
.	O
</s>
<s>
SD-WAN	B-Architecture
is	O
a	O
core	O
component	O
of	O
secure	O
access	O
service	O
edge	B-Device
solutions	O
(	O
SASE	O
)	O
which	O
incorporate	O
network	O
and	O
security	O
capabilities	O
to	O
more	O
efficiently	O
and	O
securely	O
connect	O
distributed	O
work	O
environments	O
(	O
branch	O
office	O
,	O
headquarters	O
,	O
home	O
office	O
,	O
remote	O
)	O
to	O
distributed	O
applications	O
located	O
in	O
data	B-Operating_System
centers	I-Operating_System
,	O
cloud	B-Architecture
infrastructure	O
,	O
or	O
delivered	O
by	O
SaaS	B-Architecture
services	O
.	O
</s>
<s>
With	O
SASE	O
,	O
SD-WAN	B-Architecture
is	O
combined	O
with	O
other	O
network	O
and	O
security	O
technologies	O
including	O
Cloud	B-Application
Access	I-Application
Security	I-Application
Broker	I-Application
(	O
CASB	O
)	O
,	O
Secure	B-Protocol
Web	I-Protocol
Gateway	I-Protocol
,	O
Data	B-Application
Loss	I-Application
Prevention	I-Application
(	O
DLP	O
)	O
,	O
Firewall	O
,	O
and	O
other	O
capabilities	O
to	O
connect	O
and	O
protect	O
users	O
and	O
applications	O
.	O
</s>
<s>
In	O
December	O
2021	O
,	O
research	O
firm	O
Gartner	O
estimated	O
that	O
by	O
2025	O
,	O
50%	O
of	O
SD-WAN	B-Architecture
purchases	O
will	O
be	O
part	O
of	O
a	O
single	O
vendor	O
SASE	O
offering	O
.	O
</s>
<s>
There	O
are	O
some	O
similarities	O
between	O
SD-WAN	B-Architecture
and	O
WAN	B-Protocol
optimization	I-Protocol
,	O
the	O
name	O
given	O
to	O
the	O
collection	O
of	O
techniques	O
used	O
to	O
increase	O
data-transfer	O
efficiencies	O
across	O
WANs	O
.	O
</s>
<s>
The	O
goal	O
of	O
each	O
is	O
to	O
accelerate	O
application	O
delivery	O
between	O
branch	O
offices	O
and	O
data	B-Operating_System
centers	I-Operating_System
,	O
but	O
SD-WAN	B-Architecture
technology	O
focuses	O
additionally	O
on	O
cost	O
savings	O
and	O
efficiency	O
,	O
specifically	O
by	O
allowing	O
lower	O
cost	O
network	O
links	O
to	O
perform	O
the	O
work	O
of	O
more	O
expensive	O
leased	O
lines	O
,	O
whereas	O
WAN	B-Protocol
Optimization	I-Protocol
focuses	O
squarely	O
on	O
improving	O
packet	O
delivery	O
.	O
</s>
<s>
An	O
SD-WAN	B-Architecture
utilizing	O
virtualization	B-General_Concept
techniques	O
assisted	O
with	O
WAN	B-Protocol
Optimization	I-Protocol
traffic	O
control	O
allows	O
network	O
bandwidth	O
to	O
dynamically	O
grow	O
or	O
shrink	O
as	O
needed	O
.	O
</s>
<s>
SD-WAN	B-Architecture
technology	O
and	O
WAN	B-Protocol
optimization	I-Protocol
can	O
be	O
used	O
separately	O
or	O
together	O
,	O
and	O
some	O
SD-WAN	B-Architecture
vendors	O
are	O
adding	O
WAN	B-Protocol
optimization	I-Protocol
features	O
to	O
their	O
products	O
.	O
</s>
<s>
A	O
WAN	O
edge	B-Protocol
router	I-Protocol
is	O
a	O
device	O
that	O
routes	O
data	O
packets	O
between	O
different	O
WAN	O
locations	O
,	O
giving	O
enterprise	O
access	O
to	O
a	O
carrier	O
network	O
.	O
</s>
<s>
Also	O
called	O
a	O
boundary	O
router	B-Protocol
,	O
it	O
is	O
unlike	O
a	O
core	O
router	B-Protocol
,	O
which	O
only	O
sends	O
packets	O
within	O
a	O
single	O
network	O
.	O
</s>
<s>
SD-WANs	B-Architecture
can	O
work	O
as	O
an	O
overlay	O
to	O
simplify	O
the	O
management	O
of	O
existing	O
WAN	O
edge	B-Protocol
routers	I-Protocol
,	O
by	O
lowering	O
dependence	O
on	O
routing	O
protocols	O
.	O
</s>
<s>
SD-WAN	B-Architecture
can	O
also	O
potentially	O
be	O
an	O
alternative	O
to	O
WAN	O
Edge	B-Protocol
routers	I-Protocol
.	O
</s>
<s>
SD-WANs	B-Architecture
are	O
similar	O
to	O
hybrid	O
WANs	O
,	O
and	O
sometimes	O
the	O
terms	O
are	O
used	O
interchangeably	O
,	O
but	O
they	O
are	O
not	O
identical	O
.	O
</s>
<s>
Cloud-based	B-Architecture
SD-WAN	B-Architecture
offers	O
advanced	O
features	O
,	O
such	O
as	O
enhanced	O
security	O
,	O
seamless	O
cloud	B-Architecture
,	O
and	O
support	O
for	O
mobile	O
users	O
,	O
that	O
result	O
naturally	O
from	O
the	O
use	O
of	O
cloud	B-Architecture
infrastructure	O
.	O
</s>
<s>
As	O
a	O
result	O
,	O
cloud-based	B-Architecture
SD-WAN	B-Architecture
can	O
replace	O
MPLS	B-Protocol
,	O
enabling	O
organizations	O
to	O
release	O
resources	O
once	O
tied	O
to	O
WAN	O
investments	O
and	O
create	O
new	O
capabilities	O
.	O
</s>
<s>
An	O
overview	O
discussing	O
three	O
typical	O
reasons	O
to	O
compare	O
MPLS	B-Protocol
with	O
SD-WAN	B-Architecture
.	O
</s>
<s>
Specifically	O
where	O
IT	O
teams	O
need	O
to	O
retain	O
MPLS	B-Protocol
due	O
to	O
contract	O
commitments	O
and	O
where	O
the	O
Enterprise	O
migrates	O
from	O
MPLS	B-Protocol
to	O
an	O
Internet-based	O
SD	O
WAN	O
.	O
</s>
<s>
As	O
there	O
is	O
no	O
standard	O
algorithm	O
for	O
SD-WAN	B-Architecture
controllers	O
,	O
device	O
manufacturers	O
each	O
use	O
their	O
own	O
proprietary	O
algorithm	O
in	O
the	O
transmission	O
of	O
data	O
.	O
</s>
<s>
Given	O
the	O
breadth	O
of	O
options	O
available	O
in	O
relation	O
to	O
both	O
software	O
and	O
hardware	O
SD-WAN	B-Architecture
control	O
solutions	O
,	O
it	O
's	O
imperative	O
they	O
be	O
tested	O
and	O
validated	O
under	O
real-world	O
conditions	O
within	O
a	O
lab	O
setting	O
prior	O
to	O
deployment	O
.	O
</s>
<s>
There	O
are	O
multiple	O
solutions	O
available	O
for	O
testing	O
purposes	O
,	O
ranging	O
from	O
purpose-built	O
network	B-Architecture
emulation	I-Architecture
appliances	O
which	O
can	O
apply	O
specified	O
network	O
impairments	O
to	O
the	O
network	O
being	O
tested	O
in	O
order	O
to	O
reliably	O
validate	O
performance	O
,	O
to	O
software-based	O
solutions	O
.	O
</s>
<s>
IT	O
website	O
Network	O
World	O
divides	O
the	O
SD-WAN	B-Architecture
vendor	O
market	O
into	O
three	O
groups	O
:	O
established	O
networking	O
vendors	O
who	O
are	O
adding	O
SD-WAN	B-Architecture
products	O
to	O
their	O
offerings	O
,	O
WAN	O
specialists	O
who	O
are	O
starting	O
to	O
integrate	O
SD-WAN	B-Architecture
functionality	O
into	O
their	O
products	O
,	O
and	O
startups	O
focused	O
specifically	O
on	O
the	O
SD-WAN	B-Architecture
market	O
.	O
</s>
<s>
The	O
global	O
SD-WAN	B-Architecture
market	O
stood	O
at	O
$	O
3.25	O
billion	O
in	O
2021	O
and	O
the	O
market	O
is	O
expected	O
to	O
grow	O
30%	O
in	O
2022	O
.	O
</s>
<s>
Alternatively	O
,	O
a	O
market	O
overview	O
by	O
Nemertes	O
Research	O
groups	O
SD-WAN	B-Architecture
vendors	O
into	O
categories	O
based	O
on	O
their	O
original	O
technology	O
space	O
,	O
and	O
which	O
are	O
"	O
Pure-play	O
SD-WAN	B-Architecture
providers	O
"	O
,	O
"	O
WAN	B-Protocol
optimization	I-Protocol
vendors	O
"	O
,	O
"	O
Link-aggregation	O
vendors	O
"	O
,	O
and	O
"	O
General	O
network	O
vendors	O
"	O
.	O
</s>
<s>
While	O
Network	O
World	O
's	O
second	O
category	O
(	O
startups	O
focused	O
specifically	O
on	O
the	O
SD-WAN	B-Architecture
market	O
)	O
,	O
is	O
generally	O
equivalent	O
to	O
Nemertes	O
 '	O
"	O
Pure-play	O
SD-WAN	B-Architecture
providers	O
"	O
category	O
,	O
Nemertes	O
offers	O
a	O
more	O
detailed	O
view	O
of	O
the	O
preexisting	O
WAN	O
and	O
overall	O
networking	O
providers	O
.	O
</s>
<s>
Additionally	O
,	O
Nemertes	O
Research	O
also	O
describes	O
the	O
in-net	O
side	O
of	O
the	O
SD-WAN	B-Architecture
market	O
,	O
describing	O
the	O
go-to-market	O
strategy	O
of	O
connectivity	O
providers	O
entering	O
the	O
SD-WAN	B-Architecture
market	O
.	O
</s>
<s>
MEF	O
70	O
standardizes	O
SD-WAN	B-Architecture
service	O
attributes	O
and	O
uses	O
standard	O
IPv4	O
and	O
IPv6	O
routing	O
protocols	O
.	O
</s>
<s>
SD-WAN	B-Architecture
services	O
also	O
use	O
standard	O
IPsec	B-Protocol
encryption	O
protocols	O
.	O
</s>
<s>
Additional	O
standardization	O
for	O
other	O
SD-WAN	B-Architecture
functions	O
and	O
related	O
security	O
functionality	O
not	O
covered	O
in	O
MEF	O
70	O
are	O
under	O
development	O
at	O
the	O
MEF	O
Forum	O
.	O
</s>
<s>
There	O
are	O
several	O
opensource	O
SD-WAN	B-Architecture
solutions	O
and	O
opensource	O
SD-WAN	B-Architecture
implementations	O
available	O
.	O
</s>
<s>
For	O
example	O
,	O
the	O
Linux	O
Foundation	O
has	O
three	O
projects	O
that	O
intersect	O
with	O
and	O
help	O
the	O
SD-WAN	B-Architecture
market	O
:	O
ONAP	B-Application
,	O
OpenDaylight	B-Application
Project	I-Application
,	O
and	O
the	O
Tungsten	O
Fabric	O
(	O
formerly	O
Juniper	O
Networks	O
 '	O
OpenContrail	O
)	O
.	O
</s>
