Configuring IGMP in Gaia Portal
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Important:
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IGMP is enabled by default.
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Configure a multicast routing protocol, such as PIM.
IGMP functions only in conjunction with a multicast routing protocol to calculate a multicast distribution tree.
IGMP supports IP multicast groups on a network.
For more information, see PIM.
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From the left navigation tree, click Advanced Routing > IGMP.
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For each interface, on which you enabled a multicast routing protocol:
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Select the interface and click Edit.
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Configure the IGMP interface parameters.
All parameters are optional.
IGMP interface parameters
Parameter
Description
Version
The version of the IGMP protocol.
Note - IGMP version 2 is compatible with IGMP version 1. IGMP version 3 is compatible with versions 2 and 1.
Best Practice - Use IGMP version 1 only on networks that include multicast routers that do not support IGMP versions 2 or 3.
IGMP version 3 is used to support source-specific multicast (SSM). IGMP version 3 membership reports are used to request or block multicast traffic from specific sources.
For example, when a host requests traffic for a multicast group from a specific source, SSM sends PIM join/prune messages towards the source.
The multicast group address 232.0.0.0/8 is reserved for use with SSM.
Range: 1-3
Default: 2
Loss Robustness
Allows tuning for the expected packet loss on a subnet.
If the subnet is expected to be highly lossy, then the "loss robustness" value may be increased.
IGMP protocol operation is robust to (loss robustness - 1) packet loss.
Range: 1-255
Default: 2
Query Interval
The interval (in seconds) between IGMP general queries sent by the querier router.
This parameter can be used to tune the IGMP messaging overhead and has a secondary effect on the timeout of idle IP multicast groups.
Range: 1-3600
Default: 125
Query Response Interval
The maximum response time (in seconds) inserted into the periodic IGMP general queries.
The query response interval may be used to tune the burstiness of IGMP messages.
A greater value spreads the host IGMP reports over a greater interval, reducing burstiness.
This value must always be less than the query interval.
Range: 1-25
Default: 10
Last Member Query Interval
The maximum response time (in seconds) inserted into IGMP group-specific queries.
The last member query interval may be used to tune the "leave latency".
A smaller value results in a reduction in the time to detect the loss of the last member of a multicast group.
This value must always be less than the query interval.
Range: 1-25
Default: 1
Router Alert
Allows the "disable insertion of IP router alert" option in all IGMP messages sent on the interface.
This can be useful in interoperating with broken IP implementations that may discard the packet due to the use of this option.
Options: Enabled, or Disabled
Default: Enabled
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Optional: Add a Multicast Group.
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In the Local Groups section, add a local network Multicast Group and click OK.
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In the Static Groups section, add a static Multicast group and click OK.
Multicast Group parameters
Parameter
Description
Multicast Address
The multicast address of the group.
Group Type
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Local Group
Provides a mechanism to simulate the presence of local receivers for specific groups.
When a multicast group is added to an interface, IGMP sends a membership report on the interface.
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Static Group
Provides a mechanism to simulate the presence of local receivers on an interface.
When a static group is configured on an interface that is also running a parent multicast protocol (such as PIM) IGMP informs the parent of the presence of a local receiver.
In contrast to regular IGMP, no membership reports are sent on the corresponding interface.
Important - If the same multicast group is configured as both a local and a static group, local group takes precedence, that is, membership reports are sent out on the interface.
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Click Save.
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