3Com 4210G Series, Configuration Manual, Page: 401 / 1133

4-12
To do... Use the command... Remarks
Enter system view
system-view
—
Enter VLAN view
vlan vlan-id
—
Enable the MLD Snooping
querier
mld-snooping querier
Required
Disabled by default
It is meaningless to configure an MLD Snooping querier in an IPv6 multicast network running MLD.
Although an MLD Snooping querier does not 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 multicast-address-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 bursts of MLD traffic on the network caused by reports simultaneously sent
by a large number of hosts when the corresponding timers expire simultaneously.
z
For MLD general queries, you can configure the maximum response time to fill their Max
Response time field.
z
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:
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