Multicast Routing
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CLI Configuration Guide
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T
O
C
ONFIGURE
IGMP Q
UERIER
T
IME
-
OUT
IGMP enabled router may assume one of two roles Querier or Non-Querier on an
interface. There is normally only one Querier per physical network. All multicast
routers start up as a Querier on each attached network. If a multicast router hears
a Query message from a router with a lower IP address, it become a Non-Querier
on that network. If a router has not heard a Query message from another router
for Querier time-out, it resumes the role of Querier. Routers periodically send a
General Query on each attached network for which this router is the Querier.
E
XAMPLE
ALU(config-if GigabitEthernet3/0)# ip igmp querier-timeout 100
Note:
Make sure that all IGMP routers on LAN have same querier time-out. Else, router with
less querier time-out will always become querier.
T
O
C
ONFIGURE
IGMP Q
UERY
I
NTERVAL
E
XAMPLE
ALU(config-if GigabitEthernet3/0)# ip igmp query-interval 100
Command (in ICM)
Description
ip igmp querier-timeout <60-300>
This command configures the time-
out value (in seconds) after which the
router assumes itself to be the
querier on the interface.
Default IGMP querier-timeout is
305.
Command (in ICM)
Description
ip igmp query-interval <1-65535>
This command is used to configure
the interval (in seconds) at which the
IGMP router sends query messages
on an interface.
The default query-interval is 125
seconds.
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