<s>
The	O
Narada	B-Protocol
multicast	I-Protocol
protocol	I-Protocol
is	O
a	O
set	O
of	O
specifications	O
which	O
can	O
be	O
used	O
to	O
implement	O
overlay	B-Architecture
multicast	O
functionality	O
on	O
computer	B-Architecture
networks	I-Architecture
.	O
</s>
<s>
It	O
constructs	O
an	O
overlay	B-Architecture
tree	O
from	O
a	O
redundantly	O
meshed	O
graph	O
of	O
nodes	O
,	O
source	O
specific	O
shortest	O
path	O
trees	O
are	O
then	O
constructed	O
from	O
reverse	O
paths	O
.	O
</s>
<s>
The	O
group	O
management	O
is	O
equally	O
distributed	O
on	O
all	O
nodes	O
because	O
each	O
overlay	B-Architecture
node	O
keeps	O
track	O
of	O
all	O
its	O
group	O
members	O
through	O
periodic	O
heartbeats	O
of	O
all	O
members	O
.	O
</s>
<s>
The	O
discovery	O
and	O
tree	O
building	O
is	O
similar	O
to	O
DVMRP	B-Protocol
.	O
</s>
