<s>
Web	B-Protocol
Cache	I-Protocol
Communication	I-Protocol
Protocol	I-Protocol
(	O
WCCP	O
)	O
is	O
a	O
Cisco-developed	O
content-routing	O
protocol	O
that	O
provides	O
a	O
mechanism	O
to	O
redirect	O
traffic	O
flows	O
in	O
real-time	O
.	O
</s>
<s>
It	O
has	O
built-in	O
load	B-Application
balancing	I-Application
,	O
scaling	O
,	O
fault	O
tolerance	O
,	O
and	O
service-assurance	O
(	O
failsafe	O
)	O
mechanisms	O
.	O
</s>
<s>
Cisco	B-Protocol
IOS	I-Protocol
Release	O
12.1	O
and	O
later	O
releases	O
allow	O
the	O
use	O
of	O
either	O
Version	O
1	O
(	O
WCCPv1	O
)	O
or	O
Version	O
2	O
(	O
WCCPv2	O
)	O
of	O
the	O
protocol	O
.	O
</s>
<s>
WCCP	O
L2	B-Protocol
:	O
Local	O
subnet	O
only	O
,	O
little	O
overhead	O
.	O
</s>
<s>
WCCP	O
GRE	B-Protocol
:	O
Any	O
IP-Subnet	O
,	O
more	O
overhead	O
.	O
</s>
<s>
WCCP	O
GRE	B-Protocol
return	O
.	O
</s>
<s>
WCCP	O
L2	B-Protocol
return	O
.	O
</s>
