Инструкции По Установке для 3com S7906E

 

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response time (the host obtains the value of the maximum response time from the Max Response Time 

field in the IGMP query it received). When the timer value comes down to 0, the host sends an IGMP 

report to the corresponding multicast group.  

An appropriate setting of the maximum response time for IGMP queries allows hosts to respond to 

queries quickly and avoids bursts of IGMP traffic on the network caused by reports simultaneously sent 

by a large number of hosts when the corresponding timers expire simultaneously.  

z 

For IGMP general queries, you can configure the maximum response time to fill their Max 

Response time field.  

z 

For IGMP group-specific queries, you can configure the IGMP last-member query interval to fill 

their Max Response time field. Namely, for IGMP group-specific queries, the maximum response 

time equals to the IGMP last-member query interval.  

Follow these steps to configure IGMP queries and responses globally:  

Enter system view 

system-view 

— 

Enter IGMP snooping view 

igmp-snooping 

— 

Configure the maximum 
response time to IGMP general 
queries 

max-response-time interval 

Optional 

10 seconds by default  

Configure the IGMP 
last-member query interval  

last-member-query-interval interval 

Optional 

1 second by default  

 

Follow these steps to configure IGMP queries and responses in a VLAN:  

Enter system view 

system-view 

— 

Enter VLAN view 

vlan vlan-id 

— 

Configure IGMP general query 
interval  

igmp-snooping query-interval 
interval 

Optional 

60 seconds by default  

Configure the maximum 
response time to IGMP general 
queries 

igmp-snooping max-response-time 
interval 

Optional 

10 seconds by default  

Configure the IGMP 
last-member query interval  

igmp-snooping 
last-member-query-interval interval 

Optional 

1 second by default  

 

In the configuration, make sure that the IGMP general query interval is larger than the maximum 

response time for IGMP general queries. Otherwise, multicast group members may be deleted by 

mistake.