Multi-Instance Igmp; Protocols And Standards; Igmp Configuration Task List - 3Com MSR 50 Series Configuration Manual

Multi-Instance IGMP

Protocols and Standards

IGMP Configuration
Task List
A general query does not carry a group address, nor a source address;
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A group-specific query carries a group address, but no source address;
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A group-and-source-specific query carries a group address and one or more
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source addresses.
2 Reports containing multiple group records
Unlike an IGMPv1 or IGMPv2 report message, an IGMPv3 report message is
destined to 224.0.0.22 and contains one or more group records. Each group
record contains a multicast group address and a multicast source address list.
Group record types include:
IS_IN: The source filtering mode is Include, namely, the report sender requests
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the multicast data from only the sources defined in the specified multicast
source list. If the specified multicast source list is empty, this means that the
report sender has left the reported multicast group.
IS_EX: The source filtering mode is Exclude, namely, the report sender requests
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the multicast data from any sources but those defined in the specified multicast
source list.
TO_IN: The filtering mode has changed from Exclude to Include.
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TO_EX: The filtering mode has changed from Include to Exclude.
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ALLOW: The Source Address fields in this Group Record contain a list of the
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additional sources that the system wishes to hear from, for packets sent to the
specified multicast address. If the change was to an Include source list, these
are the addresses that were added to the list; if the change was to an Exclude
source list, these are the addresses that were deleted from the list.
BLOCK: indicates that the Source Address fields in this Group Record contain a
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list of the sources that the system no longer wishes to hear from, for packets
sent to the specified multicast address. If the change was to an Include source
list, these are the addresses that were deleted from the list; if the change was
to an Exclude source list, these are the addresses that were added to the list.
While IGMP collects group memberships on a per-interface base, IGMP in a VPN
instance handles protocol packets based on the VPN instance on the interface.
Upon receiving an IGMP packet, the router determines the instance to which the
message belongs and handles the message within the instance. If it is necessary to
exchange information with another multicast protocol, the router informs the
other multicast protocol only within the VPN instance.
The following documents describe different IGMP versions:
RFC 1112: Host Extensions for IP Multicasting
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RFC 2236: Internet Group Management Protocol, Version 2
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RFC 3376: Internet Group Management Protocol, Version 3
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Complete these tasks to configure IGMP:

IGMP Configuration Task List

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