H3C Technologies H3C SecPath F1000-E - Manual (Page 928)

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To speed up the response of hosts to MLD queries and avoid simultaneous timer expirations causing MLD
report traffic bursts, you must properly set the maximum response delay.
• For MLD general queries, the maximum response delay is set by the max-response-time command.
• For MLD multicast-address-specific query and multicast-address-and-source-specific query
messages, the maximum response delay 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 when the other querier
present interval expires, it considers the querier as having failed and starts a new querier election.
Otherwise, the non-querier resets the other querier present timer.
Configuring MLD query and response parameters globally
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter MLD view. mld N/A
3. Configure the MLD querier’s
robustness variable.
robust-count robust-value 2 times by default.
4. Configure the startup query
interval.
startup-query-interval interval
By default, the startup query
interval is 1/4 of the "MLD query
interval."
5. Configure the startup query
count.
startup-query-count value
By default, the startup query count
is set to the MLD querier’s
robustness variable.
6. Configure the MLD query
interval.
timer query interval 125 seconds by default.
7. Configure the maximum
response delay for MLD
general query messages.
max-response-time interval 10 seconds by default.
8. Configure the MLD last
listener query interval.
last-listener-query-interval interval 1 second by default.
9. Configure the MLD other
querier present interval. timer other-querier-present
interval
By default, the other querier
present interval is determined by
the formula "Other querier present
interval (in seconds) = [ MLD query
interval ] × [ MLD querier’s
robustness variable ] + [ maximum
response delay for MLD general
query ] /2".
Configuring MLD query and response parameters on an interface
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Configure the MLD querier’s
robustness variable.
mld robust-count robust-value 2 times by default.