Setup Guide

When the querier receives a leave message from a host, it sends a group-specic query to the subnet. If no response is received, it sends
another. The amount of time that the querier waits to receive a response to the initial query before sending a second one is the last
member query interval (LMQI). The switch waits one LMQI after the second query before removing the group from the state table.
• Adjust the period between queries.
INTERFACE mode
ip igmp query-interval
• Adjust the time period between queries used to discover IPv6 multicast groups.
Interface mode
ipv6 mld query-interval
• Adjust the maximum response time.
INTERFACE mode
ip igmp query-max-resp-time
• Adjust the maximum amount of time that the querier waits, for an IPv6 query response, before taking further action.
Interface mode
ipv6 mld query-max-response-time
• Adjust the last member query interval.
INTERFACE mode
ip igmp last-member-query-interval
• Adjust the amount of time the querier waits, for the initial query response, before sending the next IPv6 query.
Interface mode
ipv6 mld last-member-query-interval
Enabling IGMP Immediate-Leave
If the querier does not receive a response to a group-specic or group-and-source query, it sends another (querier robustness value). Then,
after no response, it removes the group from the outgoing interface for the subnet.
IGMP immediate leave reduces leave latency by enabling a router to immediately delete the group membership on an interface after
receiving a Leave message (it does not send any group-specic or group-and-source queries before deleting the entry).
• Congure the system for IGMP immediate leave.
ip igmp immediate-leave
• Congure the system to immediately delete the IPv6 group membership on an interface after receiving a leave message.
ipv6 mld immediate-leave
• View the enable status of the IGMP immediate leave feature.
EXEC Privilege mode
show ip igmp interface
show ipv6 mld interface
View the enable status of this feature using the command from EXEC Privilege mode, as shown in the example in Selecting an IGMP
Version.
400
Internet Group Management Protocol (IGMP)