<s>
The	O
Cisco	O
Aggregation	O
Services	O
Router	B-Protocol
(	O
ASR	O
)	O
series	O
of	O
routers	B-Protocol
are	O
modular	O
routers	B-Protocol
produced	O
by	O
Cisco	O
Systems	O
.	O
</s>
<s>
The	O
highest	O
end	O
of	O
the	O
lineup	O
,	O
the	O
ASR	B-Protocol
9000	I-Protocol
series	O
,	O
is	O
intended	O
for	O
service	O
provider	O
(	O
SP	O
)	O
core	O
networks	O
.	O
</s>
<s>
Networking	O
equipment	O
was	O
traditionally	O
categorized	O
by	O
functionality	O
as	O
being	O
either	O
a	O
switch	B-Protocol
or	O
a	O
router	B-Protocol
.	O
</s>
<s>
Switches	O
bridged	O
(	O
transmitted	O
)	O
L2/Ethernet	O
traffic	O
,	O
and	O
a	O
router	B-Protocol
forwarded	O
(	O
transmitted	O
and	O
routed	O
)	O
L3/IP	O
traffic	O
.	O
</s>
<s>
As	O
products	O
became	O
more	O
sophisticated	O
,	O
the	O
distinction	O
between	O
a	O
switch	B-Protocol
and	O
a	O
router	B-Protocol
became	O
blurred	O
as	O
high-end	O
switches	O
began	O
to	O
route	O
traffic	O
in	O
addition	O
to	O
bridging	O
,	O
and	O
likewise	O
routers	B-Protocol
began	O
to	O
perform	O
L2	O
switching	O
.	O
</s>
<s>
Though	O
still	O
maintaining	O
the	O
terms	O
switch	B-Protocol
and	O
router	B-Protocol
in	O
their	O
product	O
names	O
,	O
Cisco	O
divided	O
their	O
high-end	O
networking	O
products	O
by	O
market	O
.	O
</s>
<s>
Prior	O
to	O
the	O
ASR	B-Protocol
9000	I-Protocol
series	O
,	O
Cisco	O
's	O
high-end	O
SP	O
product	O
portfolio	O
consisted	O
of	O
the	O
CRS-1	B-Protocol
,	O
the	O
GSR	B-Device
,	O
and	O
the	O
7600	O
(	O
and	O
the	O
6500	B-Device
)	O
.	O
</s>
<s>
The	O
ASR	B-Protocol
9000	I-Protocol
series	O
devices	O
are	O
the	O
successor	O
to	O
both	O
the	O
GSR	B-Device
and	O
the	O
7600	O
.	O
</s>
<s>
When	O
the	O
CRS-1	B-Protocol
is	O
deployed	O
in	O
a	O
large	O
network	O
at	O
the	O
core	O
,	O
the	O
ASR	B-Protocol
9000	I-Protocol
complements	O
it	O
on	O
the	O
edge	O
;	O
both	O
run	O
IOS-XR	B-Device
.	O
</s>
<s>
In	O
2011	O
,	O
Cisco	O
announced	O
capacity	O
upgrades	O
and	O
support	O
of	O
network	O
Virtualization	O
(	O
nV	O
)	O
capabilities	O
for	O
the	O
ASR	B-Protocol
9000	I-Protocol
.	O
</s>
<s>
In	O
2011	O
,	O
the	O
ASR	B-Protocol
9000	I-Protocol
was	O
awarded	O
"	O
Best	O
Carrier	O
Ethernet	O
Aggregation	O
Product	O
"	O
at	O
the	O
Carrier	O
Ethernet	O
World	O
Congress	O
.	O
</s>
<s>
The	O
ASR	O
900	O
series	O
is	O
a	O
chassis-based	O
modular	O
router	B-Protocol
that	O
runs	O
the	O
Cisco	B-Device
IOS	I-Device
XE	I-Device
Linux-based	O
operating	O
system	O
.	O
</s>
<s>
The	O
ASR	O
920	O
series	O
is	O
a	O
chassis-based	O
modular	O
router	B-Protocol
running	O
Cisco	B-Device
IOS	I-Device
XE	I-Device
.	O
</s>
<s>
The	O
ASR	B-Protocol
1000	I-Protocol
series	O
is	O
chassis-based	O
modular	O
router	B-Protocol
running	O
Cisco	B-Device
IOS	I-Device
XE	I-Device
.	O
</s>
<s>
Cisco	B-Protocol
ASR	I-Protocol
9000	I-Protocol
series	O
routers	B-Protocol
are	O
routers	B-Protocol
designed	O
for	O
the	O
service	O
provider	O
market	O
.	O
</s>
<s>
It	O
runs	O
the	O
IOS	B-Device
XR	I-Device
Linux-based	O
operating	O
system	O
.	O
</s>
