<s>
Protocol-dependent	B-Protocol
modules	I-Protocol
(	O
PDMs	O
)	O
are	O
used	O
by	O
the	O
routing	B-Protocol
protocol	I-Protocol
EIGRP	B-Protocol
to	O
make	O
decisions	O
about	O
adding	O
routes	O
learned	O
from	O
other	O
sources	O
;	O
for	O
example	O
other	O
routers	B-Protocol
or	O
routing	B-Protocol
protocols	I-Protocol
to	O
the	O
routing	B-Protocol
table	I-Protocol
.	O
</s>
<s>
In	O
fact	O
EIGRP	B-Protocol
has	O
the	O
capability	O
for	O
routing	O
several	O
different	O
protocols	O
including	O
IPv4	O
and	O
IPv6	B-Protocol
using	O
protocol-dependent	B-Protocol
modules	I-Protocol
(	O
PDMs	O
)	O
.	O
</s>
<s>
The	O
PDM	O
is	O
also	O
capable	O
of	O
carrying	O
information	O
from	O
the	O
routing	B-Protocol
table	I-Protocol
to	O
the	O
topology	B-Protocol
table	I-Protocol
.	O
</s>
<s>
EIGRP	B-Protocol
offers	O
support	O
for	O
various	O
routed	O
protocols	O
(	O
e.g.	O
</s>
<s>
Internet	B-Protocol
Protocol	I-Protocol
Version	I-Protocol
6	I-Protocol
(	O
IPv6	B-Protocol
)	O
,	O
IP	B-Protocol
,	O
IPX	B-Protocol
,	O
AppleTalk	B-Application
)	O
,	O
and	O
has	O
added	O
support	O
for	O
Service	O
Routing	O
(	O
SAF	O
)	O
PDMs	O
.	O
</s>
<s>
The	O
only	O
other	O
routing	B-Protocol
protocol	I-Protocol
that	O
comes	O
with	O
support	O
for	O
multiple	O
network	O
layer	O
protocols	O
is	O
Intermediate	O
System-to-Intermediate	O
System	O
(	O
IS-IS	O
)	O
.	O
</s>
<s>
"	O
In	O
theory	O
,	O
EIGRP	B-Protocol
can	O
add	O
PDMs	O
to	O
easily	O
adapt	O
to	O
new	O
or	O
revised	O
routed	O
protocols	O
such	O
as	O
IPv6	B-Protocol
.	O
</s>
<s>
The	O
IP-EIGRP	O
module	O
is	O
responsible	O
for	O
the	O
following	O
functions	O
:	O
</s>
<s>
Send	O
and	O
receive	O
EIGRP	B-Protocol
packets	O
that	O
bear	O
IP	B-Protocol
data	O
.	O
</s>
<s>
Notify	O
DUAL	O
(	O
Diffusing	B-Protocol
Update	I-Protocol
Algorithm	I-Protocol
)	O
of	O
new	O
IP	B-Protocol
routing	O
information	O
that	O
is	O
received	O
.	O
</s>
<s>
Maintain	O
the	O
results	O
of	O
DUAL	O
routing	O
decisions	O
in	O
the	O
IP	B-Protocol
routing	B-Protocol
table	I-Protocol
.	O
</s>
<s>
Redistribute	O
routing	O
information	O
that	O
was	O
learned	O
by	O
other	O
IP-capable	O
routing	O
protocols.	O
"	O
</s>
<s>
There	O
is	O
one	O
neighbor	O
table	O
per	O
each	O
protocol-dependent	B-Protocol
module	I-Protocol
.	O
</s>
