<s>
The	O
Nortel	B-Protocol
Discovery	I-Protocol
Protocol	I-Protocol
(	O
NDP	O
)	O
is	O
a	O
data	B-Protocol
link	I-Protocol
layer	I-Protocol
(	O
OSI	B-Protocol
Layer	I-Protocol
2	I-Protocol
)	O
network	O
protocol	O
for	O
discovery	O
of	O
Nortel	O
networking	O
devices	O
and	O
certain	O
products	O
from	O
Avaya	O
and	O
Ciena	O
.	O
</s>
<s>
The	O
Nortel	B-Protocol
Discovery	I-Protocol
Protocol	I-Protocol
had	O
its	O
origin	O
in	O
the	O
SynOptics	B-Protocol
Network	I-Protocol
Management	I-Protocol
Protocol	I-Protocol
(	O
SONMP	B-Protocol
)	O
,	O
developed	O
before	O
the	O
SynOptics	O
and	O
Wellfleet	O
Communications	O
merger	O
in	O
1994	O
.	O
</s>
<s>
Four	O
years	O
later	O
,	O
in	O
1998	O
,	O
Bay	O
Networks	O
was	O
acquired	O
by	O
Nortel	O
and	O
renamed	O
it	O
to	O
Nortel	B-Protocol
Discovery	I-Protocol
Protocol	I-Protocol
.	O
</s>
<s>
The	O
IEEE	B-Protocol
802.1AB	I-Protocol
or	O
Link	B-Protocol
Layer	I-Protocol
Discovery	I-Protocol
Protocol	I-Protocol
that	O
is	O
supported	O
on	O
most	O
Nortel	O
equipment	O
is	O
a	O
standards	O
based	O
(	O
vendor-neutral	O
)	O
protocol	O
that	O
supports	O
multi-vendor	O
environments	O
.	O
</s>
