3com 3031 Instruccion De Instalación
608
C
HAPTER
47: IGMP C
ONFIGURATION
Perform the following configuration in interface view.
When there are multiple multicast routers on a network segment, the querier is
responsible to send IGMP query messages to all the hosts on the LAN.
responsible to send IGMP query messages to all the hosts on the LAN.
By default, the interval is 60 seconds.
Configuring IGMP
Version
Perform the following configuration in interface view.
By default, Version 2 is used.
CAUTION: IGMP cannot switch automatically between its versions. All the routers
on a subnet should therefore be configured to the same IGMP version.
on a subnet should therefore be configured to the same IGMP version.
Configuring Other
Querier Present Interval
The Other Querier Present Interval is the length of time that must pass before a
multicast router decides that there is no longer another multicast router which
should be the querier after the querier stops sending query messages.
multicast router decides that there is no longer another multicast router which
should be the querier after the querier stops sending query messages.
Perform the following configuration in Interface view.
By default, if a router has not received the query message for twice the query
interval specified by the
interval specified by the
igmp timer query command
, or for the other querier
present interval if configured, it resumes the role of Querier.
CAUTION: The other querier present interval shall be longer than the query
interval,otherwise the querier changes too frequently, reducing network
robustness.
interval,otherwise the querier changes too frequently, reducing network
robustness.
Configuring IGMP Max
Query Response Time
The host, when receiveing a query message from the router, will configure a timer
for each multicast group it belongs to. The value of the timer is selected arbitrarily
between 0 and the maximum response time. When the value of any timer reduces
for each multicast group it belongs to. The value of the timer is selected arbitrarily
between 0 and the maximum response time. When the value of any timer reduces
Table 700 Configuring query interval
Operation
Command
Configure query interval
igmp timer query seconds
Restore the default value of query
interval
interval
undo igmp timer query
Table 701 Configuring IGMP version
Operation
Command
Select the IGMP version used by the
router
router
igmp version { 1 | 2 }
Restore the default configuration
undo igmp version
Table 702 Configuring the other querier present interval
Operation
Command
Configure the other querier present
interval
interval
igmp timer other-querier-present seconds
Restore the default value of the
other querier present interval
other querier present interval
undo igmp timer other-querier-present