Which mechanism is used by an IPv6 multicast receiver to join an IPv6 multicast group?
A.
IGMP report
B.
IGMP join
C.
MLD report
D.
General query
E.
PIM join
Explanation:
MLD Reports
The processing of MLDv1 join messages is essentially the same as with IGMPv2. When no
IPv6 multicast
routers are detected in a VLAN, reports are not processed or forwarded from the switch.
When IPv6 multicast
routers are detected and an MLDv1 report is received, an IPv6 multicast group address and an
IPv6 multicast
MAC address are entered in the VLAN MLD database. Then all IPv6 multicast traffic to the
group within the VLAN is forwarded using this address. When MLD snooping is disabled,
reports are flooded in the ingress VLAN.
When MLD snooping is enabled, MLD report suppression, called listener message
suppression, is automatically enabled. With report suppression, the switch forwards the first
MLDv1 report received by a group to IPv6 multicast routers; subsequent reports for the group
are not sent to the routers. When MLD snooping is disabled, report suppression is disabled,
and all MLDv1 reports are flooded to the ingress VLAN.The switch also supports MLDv1 proxy reporting. When an MLDv1 MASQ is received, the
switch responds with MLDv1 reports for the address on which the query arrived if the group
exists in the switch on another port and if the port on which the query arrived is not the last
member port for the address.