Multicast Listener Discovery (MLD) Snooping
Displaying MLD Status and Configuration
The following information is shown for each VLAN that has MLD snooping enabled:
■VLAN ID number and name
■Querier address: IPv6 address of the device acting as querier for the VLAN
■Querier up time: the length of time in seconds that the querier has been acting as querier
■Querier expiry time: If this switch is the querier, this is the amount of time until the switch sends the next general query. If this switch is not the querier, this is the amount of time in seconds until the current querier is considered inactive (after which a new querier election is held).
■Ports with multicast routers: ports on the VLAN that lead toward multicast routers (if any)
■Multicast group address information for each active group on the VLAN, including:
•the multicast group address
•the type of tracking for multicast joins: standard or filtered. If MLD snooping is enabled,
•expiry time: the time until the group expires if no joins are seen
•the ports that have joined the multicast group
The group addresses you see listed typically result from several network functions. In our example, several of the addresses at the top of the list for each VLAN are IANA well known addresses (see www.iana.org/assignments/