Administrator Guide

Configure the switch as a querier
Hosts that do not support unsolicited reporting wait for a general query before sending a membership report. When the multicast source
and receivers are in the same VLAN, multicast traffic is not routed, and so there is no querier. You must configure the switch to be the
querier for a VLAN so that hosts send membership reports, and the switch can generate a forwarding table by snooping.
To configure the switch as a querier for a layer 2 VLAN, use the following command:
INTERFACE VLAN Mode
ipv6 mld snooping querier
NOTE: You must configure an IP address for the VLAN.
The source address of the queries is 0 to distinguish these queries from the router queries. If the system receives a query with a non-zero
address any VLAN interface, it stops sending queries. When a VLAN configured with snooping querier comes up, the VLAN interface waits
for the querier timeout to expire before becoming a querier.
Specify port as connected to multicast router
To statically specify or view a port in a VLAN, use the following commands:
1. Statically specify a port in a VLAN as connected to a multicast router.
INTERFACE VLAN mode
ipv6 mld snooping mrouter
2. View the ports that are connected to multicast routers.
EXEC Privilege mode
show ipv6 mld snooping mrouter
Enable Snooping Explicit Tracking
The switch can be a querier, and therefore also has an option of updating the group table through explicit-tracking. Whether the switch is
the querier or not, if snooping is enabled, the switch tracks all the MLD joins. It has a separate explicit tracking table which contains group,
source, interface, VLAN, and reporter details.
1. To configure the system to remove the group immediately after receiving a Leave message, use the following command:
INTERFACE VLAN Mode
ipv6 mld snooping explicit-tracking
2. To display the MLD explicit-tracking table, use the following command.
EXEC Pivilege
show ipv6 mld snooping groups explicit
Display the MLD Snooping Table
1. To display the MLD snooping table, use the following command:
EXEC Privilege
show ipv6 mroute snooping vlan
2. To display the group information in the table, use the following command:
EXEC Privilege
show ipv6 mld snooping groups
Multicast Listener Discovery Protocol
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