DGS-6604
ip igmp snooping querier
CLI Reference Guide
277
ip igmp snooping querier
Use this command to enable the IGMP Snooping querier function in Layer 2
networks. Use the no form of this command to disable the function of the IGMP
Snooping Querier.
ip igmp snooping querier
no ip igmp snooping querier
Syntax
None
Default
Disabled
Command Mode
VLAN Interface configuration
Usage Guideline
The system can work as the querier role when the querier for an IGMP snooping
domain is enabled. If the system receives query packets from other routers, the
IP address of the system and the IP address of the other routers is used to
determine the final querier. The routers (network devices) with lower IP
addresses become the querier.
The querier sends a general query at the interval specified by query-interval.
Upon receiving the general query, the IGMP client (or host) needs to respond to
the query packet in order to express that it remains in the specified group. The
maximum response time instructs the client to report within the time period
specified.
If the IGMP snooping entity does not receive a report from a client for a specific
group after a specific time period, the port is removed from the member port list
of the specific group. This specific time period is referred to as the group
membership interval. The group membership interval is equal to
query-interval
*
robustness variable
+
max response time
.
The timeout period for a querier (other querier present interval) is
query-interval
*
robustness variable
+ 1/2
max response time
. The time-out period for
learning of a router port is the same value as for the other querier present
interval.
The query-interval value can be changed using the
ip igmp query-interval
command (defined in IGMP command document).
As IGMP is enabled on the specified VLAN of the switch, the IGMP snooping
querier is suspended at the VLAN as if it were disabled, because of IGMP.
Example
This example shows how to enable IGMP Snooping querier state on VLAN 1.
Verify the settings by entering the
show ip igmp snooping
command.
Switch> configure terminal
Switch(config)# interface vlan1
Switch(config-if)#ip igmp snooping querier
Switch(config-if)# end
Switch#
Summary of Contents for DGS-6600-48TS
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