Multicast Overview
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Alcatel-Lucent
Beta Beta
OmniAccess 5740 Unified Services Gateway CLI Configuration Guide
When a router receives a Report, it adds the group being reported to the list of
multicast group memberships on the network on which it received the Report and
sets the timer for the membership (Group Membership Interval). Repeated
Reports refresh the timer. If no Reports are received for a particular group before
this timer has expired, the router assumes that the group has no local members
and that it need not forward remotely-originated multicasts for that group onto the
attached network.
When host joins multicast group, it transmit IGMPv2 report message. Host sends
this report 2-3 times to avoid membership report being lost. IGMPv2 host sends
group leave message before leaving group.
When a Querier receives a Leave Group message for a group that has group
members on the reception interface, it sends (Last Member Query Count) Group-
Specific Queries every (Last Member Query Interval) to the group being left. If no
Reports are received after the response time of the last query expires, the routers
assume that the group has no local members. IGMPv2 is compatible with IGMPv1
routers.
The OmniAccess 5740 USG supports IGMPv2 as default IGMP version. As
IGMPv2 is backward compatible, it works well with IGMPv1 host as well.
RFCS
• PIM-SM: Supported RFC 4601
• IGMP: Supported version 2. RFC 2236
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