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DES-7200 Configuration Guide Chapter 3 IGMP
Configuration
3-6
Command Function
DES-7200 (config-if) # ip igmp
last-member-query-count count
Configure the query count of last member
in the range of 2 to 7, 2 by default.
DES-7200 (config-if) # no ip igmp
last-member-query-count
Restore to the default value.
3.2.6 Configuring Query Interval of General Member
The querier device sends the general member query message at intervals to all
hosts to verify the current membership. The multicast IP address is 224.0.0.1,
TTL is 1 and the default value is 125s.
Use the following command in the interface configuration mode to configure the
query interval of general member:
Command Function
DES-7200 (config-if) # ip igmp
query-interval seconds
Configure the query interval of general
member in the range of 1 to 18000
seconds, 125s by default.
DES-7200 (config-if) # no ip igmp
query-interval seconds
Restore to the default value.
3.2.7 Configuring the Maximum Response Time
The membership query message sent by the querier device requires the
maximum response time. Shorting this response time can make the device know
the change of the members earlier, which will result in increase of the member
reports diffusing in the network. The network administrator can consider a tradeoff
between the two factors and then decide a proper value for the period, 10
seconds by default. Another consideration in configuring the response time is that
it shall be shorter than the query interval.
Use the following commands in the interface configuration mode to configure the
maximum response time:
Command Function
DES-7200 (config-if) # ip igmp
query-max-response-time seconds
Configure the maximum response time in
the rnage1-25s.
DES-7200 (config-if) # no ip igmp
query-max-response-time seconds
Restore to the default value.
3.2.8 Configuring the Timer of Other Querier
Once the timer times out, the querier considers that there is no other querier on
the network. This is helpful for the election of querier. You can short this timer in
the circumstance where the querier changes frequently to speed up response.
Use the following commands in the interface configuration mode to configure the
timer of other querier:
Command Function
DES-7200 (config-if) # ip igmp
query-timeout seconds
Configure the timer of other querier in the
range of 60 to 300 seconds, 255 seconds
by default.
DES-7200 (config-if) # no ip igmp
query-timeout
Restore to the default value.