User's Manual

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sends the query message. If the report message is not received after the timer ages, the switch
will delete the multicast address.
Perform the following configurations in global configuration mode:
Command Description
ip igmp-snooping timer response-time
timer_value Configures the value of Response Time of
IGMP-snooping.
no ip igmp-snooping timer response-time
Resumes the default value of Response
Time of IGMP-snooping.
Note:
The timer value cannot be too small. Otherwise, the multicast communication will be unstable.
The value of Response Time of IGMP snooping is set to 15 seconds.
42.1.9 Configuring Querier of IGMP Snooping
If the multicast router does not exist in VLAN where IGMP snooping is activated, the querier
function of IGMP snooping can be used to imitate the multicast router to regularly send IGMP
query message. (The function is global, that is, it can be enabled or disabled in VLAN where
IGMP snooping is globally enabled.)
When the multicast router does not exist in LAN and multicast flow does not need routing, the
automatic query function of the switch can be activated through IGMP snooping, enabling IGMP
snooping to work properly.
Perform the following configurations in global configuration mode:
Command Description
[
no
]
ip igmp-snooping querier
[address
[ip_addr]
Configures the querier of IGMP-snooping. The optional parameter
address
is the source IP address of
query
message.
The IGMP-snooping querier function is disabled by default. The source IP address of fake query message
is 10.0.0.200 by default.
Note:
If the querier function is enabled, the function is disabled when the multicast router exists in VLAN; the function can be automatically
activated when the multicast router times out.
42.1.10 Configuring IGMP Snooping’s Querier Time
Querier Time is the time interval when switch as local IGMP querier sends messages. Timer broadcasts query
message within VLAN after aging.
Configure the following in the global configuration mode:
Command Operation
ip igmp-snooping querier
querier-timer
timer_value
Configures the value of IGMP snooping
’
s
Querier Time