Configuring Mld Fast Leave Processing - 3Com MSR 50 Series Configuration Manual

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Configuring MLD Fast
Leave Processing
To do...
Configure the MLD querier
robustness variable
Configure the maximum
response delay for MLD
general query messages
Configure the last listener
query interval
Configure the MLD last
listener query count
Configure the MLD other
querier present interval
If not configured manually, the other querier present timeout is determined by
■
the formula: Other querier present timeout interval (in seconds) = ([ MLD query
interval) ] times ([ MLD querier robustness variable) ] plus ([ one half of the
maximum response delay of for MLD general query). ] divided by two. By
default, the values of these three parameters are 125, 2 and 10, respectively, so
the default other querier present interval = 125 x 2 + 10 / 2 = 255 (seconds).
If manually configured, the other querier present interval takes the configured
■
value.
CAUTION:
Make sure that the other querier present interval is greater than the MLD query
■
interval; otherwise the MLD querier may frequently change.
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.
In some applications, such as ADSL dial-up networking, only one multicast receiver
host is attached to a port of the MLD querier. To allow fast response to the MLD
done messages of the host when it switches frequently from one IPv6 multicast
group to another, you can enable MLD fast leave processing on the MLD querier.
With fast leave processing enabled, after receiving an MLD done message from a
host, the MLD querier sends a leave notification to the upstream immediately
without first sending MLD multicast-address-specific queries. In this way, the leave
latency is reduced on one hand, and the network bandwidth is saved on the other
hand.
Configuring MLD fast leave processing globally
Follow these steps to configure MLD fast leave processing globally:
To do...
Enter system view
Enter MLD view
Adjusting MLD Performance
Use the command...
mld robust-count
robust-value
mld max-response-time
interval
mld
last-listener-query-interval
interval
mld robust-count
robust-value
mld timer
other-querier-present
interval
Use the command...
system-view
mld
1229
Remarks
Optional
2 times by default
Optional
10 seconds by default
Optional
1 second by default
Optional
2 times by default
Optional
For the default, see "Note"
below.
Remarks
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