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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
Switch Management and Operating Concepts 113
the router should forward multicast packets it receives to the
subnetworks it is attached to or not. A multicast router that
has received a multicast packet will check to determine if there
is at least one member of a multicast group that has requested
to receive multicast packets from this source. If there is one
member, the packet is forwarded. If there are no members, the
packet is dropped.
IGMP Versions 1 and 2
Users that want to receive multicast packets need to be able to
join and leave multicast groups. This is accomplished using
IGMP.
Figure 5-15. IGMP Message Format
The IGMP Type codes are shown below:
Type Meaning
0x11
Membership Query (if Group Address is 0.0.0.0)
0x1
1
Specific Group Membership Query (if Group Address
is Present)
0x1
6
Membership Report (version 2)
0x1
7
Leave a Group (version 2)
0x1 Membership Report (version 1)