Protocols And Standards - HP 6125XLG Ip Multicast Configuration Manual

receiver members will receive the report and suppress their own reports. In this case, the switch cannot
determine whether the reported IPv6 multicast group still has active members attached to that port. For
more information about the MLD report suppression mechanism, see
Done message
When a host leaves an IPv6 multicast group, the host sends an MLD done message to the multicast
routers. When the switch receives the MLD done message on a dynamic member port, the switch
examines whether a forwarding entry matches the IPv6 multicast group address in the message as
follows.
If no match is found, the switch directly discards the MLD done message.
•
• If a match is found but the receiving port is not in the forwarding entry, the switch directly discards
the MLD done message.
If a match is found and the receiving port is in the forwarding entry, the switch forwards the done
•
message to all router ports in the VLAN. The switch does not immediately remove the port from the
forwarding entry for that group. Instead, it restarts the aging timer for the port.
After receiving the MLD done message, the MLD querier resolves the IPv6 multicast group address in the
message. Then, it sends an MLD multicast address specific query to the IPv6 multicast group through the
port that received the done message.
After receiving the MLD multicast address specific query, the switch forwards the query through all its
router ports in the VLAN and all member ports of the IPv6 multicast group. It waits for the responding
MLD reports from the directly connected hosts to check for the existence of members for the IPv6 multicast
group. For the port that receives the done message (assuming that it is a dynamic member port), the
Layer 2 device also performs one of the following actions:
• If the port receives an MLD report before the aging timer expires, the switch adjusts the aging timer
for the port.
If the port does not receive any MLD reports when the aging timer expires, the switch removes the
•
port from the forwarding entry for the IPv6 multicast group.

Protocols and standards

RFC 4541, Considerations for Internet Group Management Protocol (IGMP) and Multicast Listener
Discovery (MLD) Snooping Switches
216
"Configuring MLD."