3Com S7902E, Руководство по настройке

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To do… Use the command… Remarks
Configure the startup query
count mld startup-query-count
value
Optional
For the system default, see
“Note” below.
Configure the MLD query
interval
mld timer query interval
Optional
125 seconds by default.
Configure the MLD querier
robustness variable mld robust-count
robust-value
Optional
2 times by default
Configure the maximum
response delay for MLD
general query messages
mld max-response-time
interval
Optional
10 seconds by default
Configure the MLD last listener
query interval
mld
last-listener-query-interval
interval
Optional
1 second by default
Configure the MLD other
querier present interval mld timer
other-querier-present
interval
Optional
For the system default, see
“Note” below.
z
If not statically configured, the startup query interval is 1/4 of the “MLD query interval”. By default,
the MLD query interval is 125 seconds, so the startup query interval = 125 / 4 = 31.25 (seconds).
z
If not statically configured, the startup query count is set to the MLD querier robustness variable. By
default, the MLD querier robustness variable is 2, so the startup query count is also 2.
z
If not statically configured, the other querier present interval is determined by the formula: Other
querier present interval (in seconds) = [ MLD query interval ] times [ MLD querier robustness
variable ] plus [ maximum response delay for MLD general query ] divided by two. The default
values of these three parameters are 125, 2, and 10 respectively, so the other querier present
interval = 125 x 2 + 10 / 2 = 255 (seconds).
z
If statically configured, the startup query interval, the startup query count, and the other querier
present interval take the configured values.
z
Make sure that the other querier present interval is greater than the MLD query interval; otherwise
the MLD querier may frequently change.
z
Make sure that the MLD query interval is greater than the maximum response delay for MLD
general queries; otherwise, multicast group members may be wrongly removed.
Configuring MLD Fast Leave Processing
MLD fast leave processing is implemented by MLD Snooping. For details, refer to MLD Snooping
Configuration in the IP Multicast Volume .