<s>
Multicast	B-Protocol
Listener	I-Protocol
Discovery	I-Protocol
(	O
MLD	O
)	O
is	O
a	O
component	O
of	O
the	O
Internet	B-Protocol
Protocol	I-Protocol
Version	I-Protocol
6	I-Protocol
(	O
IPv6	B-Protocol
)	O
suite	O
.	O
</s>
<s>
MLD	O
is	O
used	O
by	O
IPv6	B-Protocol
routers	O
for	O
discovering	O
multicast	O
listeners	O
on	O
a	O
directly	O
attached	O
link	O
,	O
much	O
like	O
Internet	B-Protocol
Group	I-Protocol
Management	I-Protocol
Protocol	I-Protocol
(	O
IGMP	B-Protocol
)	O
is	O
used	O
in	O
IPv4	B-Protocol
.	O
</s>
<s>
The	O
protocol	O
is	O
embedded	O
in	O
ICMPv6	B-Protocol
instead	O
of	O
using	O
a	O
separate	O
protocol	O
.	O
</s>
<s>
MLDv1	B-Protocol
is	O
similar	O
to	O
IGMPv2	B-Protocol
and	O
MLDv2	B-Protocol
similar	O
to	O
IGMPv3	B-Protocol
.	O
</s>
<s>
The	O
ICMPv6	B-Protocol
messages	O
use	O
type	O
143	O
.	O
</s>
<s>
Several	O
operating	O
system	O
support	O
MLDv2	B-Protocol
:	O
</s>
