20.
IGMP Snooping
MN700004 Rev 01
249
1. Sends a specific query for that group, with the response time field set to 10 seconds.
2. Waits 120 seconds
3. If no join packet is received – the switch sends a specific query for that group with the
response time field set to 10 seconds.
4. Waits 120 seconds.
5. If no join packet is received - waits10 more seconds.
6. If no join packet is received - sends the leave packet to the Multicast router port .
NOTE
This is done also when Immediate leave is enabled but the host is not the last member of
that group.
Command Syntax
device-name
(config)#
ip igmp snooping router-timers
{
query
<
1-65535
>|
responses
<
responses-value
>|
robustness
<
robustness-value
>}
Argument Description
query <1-65535>
The time interval, in seconds, between two specific queries. The default value
is 120 seconds. The range is <1-65535>.
responses
<responses-value>
The expected response time, in seconds, for answering a specific query. The
default value is 10 seconds. The range is <1-125>.
This value will be inserted in the response-time field of the specific query
packet generated by the switch.
The response time must be greater than zero and less than the query interval.
robustness
<robustness-
value>
The number of specific query packets sent by the switch. The default value is
2. Any number higher then 1 is a valid value.
Example
device-name
(config)#
ip igmp snooping router-timers query 30
Query interval is 30 sec
device-name
(config)#
ip igmp snooping router-timers responses 55
device-name
(config)#
ip igmp snooping router-timers robustness 7555555
Four specific queries will be sent every 30 seconds with response time set to 55 seconds. If no
join is received after 220 seconds, the leave packet will be sent to the Multicast router port.
ip igmp snooping send-query
The
ip igmp snooping send-query
command, in Global Configuration mode
,
defines the
query generator
.
The query generator can be implemented only when IGMP Snooping is
enabled. It generates queries at the configured rate (query-interval). Up to 10 simultaneous
queries can be sent. To disable the query generator, use the
no
form of this command.
