H3C Technologies H3C S7500E Series Switches - Manual (Page 337)

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response delay (the host obtains the maximum response delay from the Maximum Response Delay
field in the MLD query message it received). When the timer value drops to 0, the host sends an MLD
membership report message to the corresponding IPv6 multicast group.
Proper setting of the maximum response delay of MLD query messages not only allows hosts to
respond to MLD query messages quickly, but also avoids bursts of MLD traffic on the network caused
by reports simultaneously sent by a large number of hosts when corresponding timers expire
simultaneously.
z For MLD general queries, you can configure the maximum response delay to fill their Maximum
Response Delay field.
z For MLD multicast-address-specific query and multicast-address-and-source-specific query
messages, you can configure the last listener query interval to fill their Maximum Response Delay
field. That is to say, the maximum response time of MLD general query messages equals the last
listener query interval.
When multiple multicast routers exist on the same subnet, the MLD querier is responsible for sending
MLD query messages. If a non-querier router receives no MLD query from the querier within the “other
querier present interval”, it will assume that the querier has failed and a new querier election process
is launched. Otherwise, the non-querier will reset “other querier present timer”.
Configuring MLD query and response parameters globally
Follow these steps to configure MLD query and response parameters globally:
To do… Use the command… Remarks
Enter system view system-view —
Enter MLD view mld —
Configure the MLD querier’s
robustness variable
robust-count robust-value
Optional
2 times by default
Configure the startup query
interval
startup-query-interval interval
Optional
By default, the startup query
interval is 1/4 of the “MLD query
interval”.
Configure the startup query count startup-query-count value
Optional
By default, the startup query count
is set to the MLD querier’s
robustness variable.
Configure the MLD query interval timer query interval
Optional
125 seconds by default.
Configure the maximum response
delay for MLD general query
messages
max-response-time interval
Optional
10 seconds by default