<s>
Fabric	B-Architecture
Shortest	I-Architecture
Path	I-Architecture
First	I-Architecture
(	O
FSPF	B-Architecture
)	O
is	O
a	O
routing	B-Protocol
protocol	I-Protocol
used	O
in	O
Fibre	B-Architecture
Channel	I-Architecture
computer	B-Architecture
networks	I-Architecture
.	O
</s>
<s>
It	O
calculates	O
the	O
best	O
path	O
between	O
network	B-Protocol
switches	I-Protocol
,	O
establishes	O
routes	O
across	O
the	O
fabric	O
and	O
calculates	O
alternate	O
routes	O
in	O
event	O
of	O
a	O
failure	O
or	O
network	B-Architecture
topology	I-Architecture
change	O
.	O
</s>
<s>
FSPF	B-Architecture
can	O
guarantee	O
in-sequence	O
delivery	O
of	O
frames	O
,	O
even	O
if	O
the	O
routing	O
topology	B-Architecture
has	O
changed	O
during	O
a	O
failure	O
,	O
by	O
enforcing	O
a	O
'	O
hold	O
down	O
 '	O
time	O
before	O
a	O
new	O
path	O
is	O
activated	O
.	O
</s>
<s>
FSPF	B-Architecture
was	O
created	O
by	O
Brocade	O
Communications	O
Systems	O
in	O
collaboration	O
with	O
Gadzoox	O
,	O
McDATA	O
,	O
Ancor	O
Communications	O
(	O
now	O
QLogic	O
)	O
,	O
and	O
Vixel	O
;	O
it	O
was	O
submitted	O
as	O
an	O
American	O
National	O
Standards	O
Institute	O
standard	O
.	O
</s>
<s>
The	O
protocol	O
is	O
similar	O
in	O
conception	O
to	O
the	O
Open	B-Protocol
Shortest	I-Protocol
Path	I-Protocol
First	I-Protocol
used	O
in	O
IP	O
networks	O
.	O
</s>
<s>
FSPF	B-Architecture
has	O
been	O
adopted	O
as	O
the	O
industry	O
standard	O
for	O
routing	O
between	O
Fibre	B-Architecture
Channel	I-Architecture
switches	O
within	O
a	O
fabric	O
.	O
</s>
<s>
A	O
management	O
information	O
base	O
for	O
FSPF	B-Architecture
was	O
published	O
as	O
RFC	O
4626	O
.	O
</s>
