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DES-7200 Configuration Guide Chapter 9 MLD Snooping Configuration
9-4
A host will send MLD membership report to MLD queriers under following
conditions:
When receiving MLD (group-general or group-specific) query message, the
listener hosts of IPv6 multicast group will respond with MLD membership report
message.
When joining certain IPv6 multicast group, a host will actively send MLD
membership report message to MLD queriers to announce its joining in this IPv 6
multicast group.
A switch transmits through all routers in VLAN the MLD membership report
message being received, resolve the IPv6 multicast group addresses which hosts
will join, and process the receive port in the following ways:
If the forwarding-table corresponding to this IPv6 multicast group does not exist, a
forwarding-table should be created. And the port should be added as a dynamic
listener port to the list of outgoing ports and its aging timer should be enabled.
If the forwarding-table corresponding to this IPv6 multicast group already exists,
but the list of its outgoing ports does not include this port, the port should be
added as a dynamic listener port to the list of outgoing ports and its aging timer
should be enabled.
If the forwarding-table corresponding to this IPv6 multicast group already exists,
and the list of its outgoing ports includes this dynamic listener port, then its aging
timer should be reset.
3. MLD LEAVE
When leaving IPv6 multicast group, a host will send MLD leave message to notify
the multicast router that it has left certain IPv6 multicast group.
A switch will
directly forward to router port the MLD leave message it receives from certain
dynamic listener port.
When the fast–leave function is enabled, the equipment will
directly remove relevant ports from the list of ports that transmit corresponding
group records.
9.1.4 Protocol Specification
Relevant Protocol specification:
RFC4541
9.2 MLD Snooping Configuration Task
9.2.1 Default Configuration
The following table is used to describe the default configuration of MLD Snooping.
Function characteristics Default value
Global MLD Snooping switch Disabled
VLAN-based MLD Snooping switch Enabled
Aging interval of router ports 300s
Max-response-time for MLD query 10s
Function as a dynamic learn router port Disabled
The function of fast–leave from multicast listener ports Disabled