Basic Functions Of Layer 2 Multicast; Introduction - Raisecom ISCOM2600G-HI (A) Series Configuration Manual

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ISCOM2600G-HI (A) Series Configuration Guide
IGMP manages group members through interaction of IGMP packets between the host and
multicast router. IGMP packets are encapsulated in IP packets, including Query packets,
Report packets, and Leave packets. Basic functions of IGMP are as below:
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Up to now, IGMP has three versions: IGMPv1, IGMPv2, and IGMPv3. The newer version is
fully compatible with the older version. Currently the most widely used version is IGMPv2,
while IGMPv1 does not support the Leave packet.
Layer 2 multicast runs on Layer 2 devices between the host and multicast router.
Layer 2 multicast manages and controls multicast groups by monitoring and analyzing IGMP
packets exchanged between hosts and multicast routers to implement forwarding multicast
data at Layer 2 and suppress multicast data diffusion at Layer 2.
Supported multicast features
The ISCOM2600G-HI series switch supports the following multicast features:
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8.2 Basic functions of Layer 2 multicast

8.2.1 Introduction

Basic IGMP functions are as below:
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Basic functions of Layer 2 multicast provide Layer 2 multicast common features, which must
be used on the ISCOM2600G-HI series switch enabled with IGMP Snooping or IGMP MVR.
The host sends Report packets to join the multicast group, sends Leave packets to leave
the multicast group, and automatically determines which multicast group packets to
receive.
The multicast router sends Query packets periodically, and receives Report packets and
Leave packets from hosts to understand the multicast group members in connected
segment. The multicast data will be forwarded to the segment if there are multicast group
members, and not forward if there are no multicast group members.
Basic functions of IGMP
IGMP Snooping
IGMP Multicast VLAN Registration (MVR)
IGMP filtering
Any two of IGMP Snooping, IGMP MVR, and multicast VLAN copy cannot be
concurrently enabled in the same multicast VLAN. Multicast VLAN copy and IGMP
MVR cannot be enabled concurrently in the same multicast group of the same
multicast VLAN.
The ISCOM2600G-HI series switch supports IGMPv1, IGMPv2, and IGMPv3.
Assign the multicast router interface.
Enable immediate leave.
Configure multicast forwarding entries and the aging time of router interfaces.
Enable IGMP ring network forwarding.
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