Ruby Tech GS-2224L User Manual page 14

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When queried, sends group membership reports to the
group.
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When one of its hosts joins a multicast address group to
which none of its other hosts belong, sends unsolicited
group membership reports to that group.
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When the last of its hosts in a particular multicast group
leaves the group, sends an unsolicited leave group
membership report to the all-routers group (244.0.0.2).
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