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User’s Manual of IGSW-2840
207
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Leave a Group (version 2)
0x12
Membership Report (version 1)
IGMP packets enable multicast routers to keep track of the membership of multicast groups, on their respective sub networks.
The following outlines what is communicated between a multicast router and a multicast group member using IGMP.
A host sends an IGMP
“report”
to join a group
A host will never send a report when it wants to leave a group (for version 1).
A host will send a
“leave”
report when it wants to leave a group (for version 2).
Multicast routers send IGMP queries (to the all-hosts group address: 224.0.0.1) periodically to see whether any group members
exist on their sub networks. If there is no response from a particular group, the router assumes that there are no group members
on the network.
The
Time-to-Live (TTL)
field of query messages is set to 1 so that the queries will not be forwarded to other sub networks.
IGMP version 2 introduces some enhancements such as a method to elect a multicast queried for each LAN, an explicit leave
message, and query messages that are specific to a given group.
The states a computer will go through to join or to leave a multicast group are shown below:
Non-Member
Delaying Member
Idle Member
Leave Group
Leave Group
(Stop Timer)
Join Group
(Send Report,
Start Timer)
Query Received
(Start Timer)
Report Received
(Stop Timer)
Timer Expried
(Send report)
IGMP State Transitions
Summary of Contents for IGSW-2840
Page 23: ...User s Manual of IGSW 2840 23 A 2 10 100Mbps 10 100Base TX 665 APPENDEX B GLOSSARY 667 ...
Page 110: ...User s Manual of IGSW 2840 110 Figure 4 3 14 SNMPv3 View Edit screenshot ...
Page 119: ...User s Manual of IGSW 2840 119 Figure 4 4 7 Mirror Port Configuration screenshot ...
Page 205: ...User s Manual of IGSW 2840 205 Multicast Service Multicast flooding ...
Page 216: ...User s Manual of IGSW 2840 216 Figure 4 9 7 IGMP Member Port Table screenshot ...
Page 280: ...User s Manual of IGSW 2840 280 Figure 4 11 19 SSH Host Key Settings screenshot ...
Page 315: ...User s Manual of IGSW 2840 315 Figure 4 11 44 MAC ACL Settings screenshot ...
Page 317: ...User s Manual of IGSW 2840 317 Figure 4 11 46 ACL Port Binding Settings screenshot ...
Page 431: ...User s Manual of IGSW 2840 431 tacacs 1 Console ...