<s>
The	O
Virtual	B-Protocol
Switch	I-Protocol
Redundancy	I-Protocol
Protocol	I-Protocol
(	O
VSRP	O
)	O
is	O
a	O
proprietary	O
network	O
resilience	O
protocol	O
developed	O
by	O
Foundry	O
Networks	O
and	O
currently	O
being	O
sold	O
in	O
products	O
manufactured	O
by	O
both	O
Brocade	O
Communications	O
Systems	O
(	O
formerly	O
Foundry	O
Networks	O
)	O
and	O
Hewlett	O
Packard	O
.	O
</s>
<s>
The	O
protocol	O
differs	O
from	O
many	O
others	O
in	O
use	O
as	O
it	O
combines	O
Layer	B-Protocol
2	I-Protocol
and	O
Layer	B-Application
3	I-Application
resilience	O
–	O
effectively	O
doing	O
the	O
jobs	O
of	O
both	O
Spanning	B-Protocol
tree	I-Protocol
protocol	I-Protocol
and	O
the	O
Virtual	B-Protocol
Router	I-Protocol
Redundancy	I-Protocol
Protocol	I-Protocol
at	O
the	O
same	O
time	O
.	O
</s>
<s>
Whilst	O
the	O
restrictions	O
on	O
the	O
physical	O
topologies	O
able	O
to	O
make	O
use	O
of	O
VSRP	O
mean	O
that	O
it	O
is	O
less	O
flexible	O
than	O
STP	O
and	O
VRRP	B-Protocol
,	O
it	O
does	O
significantly	O
improve	O
on	O
the	O
failover	O
times	O
provided	O
by	O
either	O
of	O
those	O
protocols	O
.	O
</s>
