Protocols And Standards; Mld Snooping Configuration Task List - 3Com 4500G Family Configuration Manual

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If the forwarding table entry does not exist or if the outgoing port list does not contain the port, the

switch discards the MLD done message instead of forwarding it to any port.

If the forwarding table entry exists and the outgoing port list contains the port, the switch forwards

the MLD done message to all router ports in the native VLAN. Because the switch does not know

whether any other hosts attached to the port are still listening to that IPv6 multicast group address,

the switch does not immediately remove the port from the outgoing port list of the forwarding table

entry for that group; instead, it resets the aging timer for the port.

Upon receiving an MLD done message from a host, the MLD querier resolves the IPv6 multicast group

address in the message and sends an MLD multicast-address-specific query to that IPv6 multicast

group address through the port that received the MLD done message. Upon receiving the MLD

multicast-address-specific query, the switch forwards it through all the router ports in the VLAN and all

member ports for that IPv6 multicast group, and performs the following to the receiving port:

If any MLD report in response to the MLD multicast-address-specific query is received on the port

(suppose it is a dynamic member port) before its aging timer expires, this means that some host

attached to the port is receiving or expecting to receive IPv6 multicast data for that IPv6 multicast

group. The switch resets the aging timer for the port.

If no MLD report in response to the MLD multicast-address-specific query is received on the port

before its aging timer expires, this means that no hosts attached to the port are still listening to that

IPv6 multicast group address. The switch removes the port from the outgoing port list of the

forwarding table entry for that IPv6 multicast group when the aging timer expires.