590 CHAPTER 43: MLD SNOOPING CONFIGURATION
take part in MLD querier elections, it may affect MLD querier elections because it
sends MLD general queries with a low source IPv6 address.
Configuring MLD
Queries and Responses
You can tune the MLD general query interval based on actual condition of the
network.
Upon receiving an MLD query (general query or group-specific query), a host starts
a timer for each IPv6 multicast group it has joined. This timer is initialized to a
random value in the range of 0 to the maximum response time (the host obtains
the value of the maximum response time from the Max Response Time field in the
MLD query it received). When the timer value comes down to 0, the host sends an
MLD report to the corresponding IPv6 multicast group.
An appropriate setting of the maximum response time for MLD queries allows
hosts to respond to queries quickly and avoids burstiness of MLD traffic on the
network caused by reports simultaneously sent by a large number of hosts when
the corresponding timers expire simultaneously.
■ For MLD general queries, you can configure the maximum response time to fill
their Max Response time field.
■ For MLD multicast-address-specific queries, you can configure the MLD
last-member query interval to fill their Max Response time field. Namely, for
MLD multicast-address-specific queries, the maximum response time equals to
the MLD last-member query interval.
Configuring MLD queries and responses globally
Follow these steps to configure MLD queries and responses globally:
Configuring MLD queries and responses in a VLAN
Follow these steps to configure MLD queries and responses in a VLAN
To do… Use the command… Remarks
Enter system view system-view -
Enter MLD Snooping view mld-snooping -
Configure the maximum
response time for MLD
general queries
max-response-time interval Optional
10 seconds by default
Configure the MLD
last-member query interval
last-listener-query-interval
interval
Optional
1 second by default
To do… Use the command… Remarks
Enter system view system-view -
Enter VLAN view vlan vlan-id -
Configure MLD query interval mld-snooping
query-interval interval
Optional
125 seconds by default
Configure the maximum
response time for MLD
general queries
mld-snooping
max-response-time interval
Optional
10 seconds by default
Configure the MLD
last-member query interval
mld-snooping
last-listener-query-interval
interval
Optional
1 second by default
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