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166
Present)
0x16
Membership Report (version 2)
0x17
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:
Summary of Contents for NS4702-24P-4S-4X
Page 1: ...NS4702 24P 4S 4X User Manual P N 1072829 REV 00 01 ISS 14JUL14 ...
Page 23: ...23 Storage Temperature 10 70 degrees C Relative Humidity 5 95 non condensing ...
Page 164: ...164 Figure 4 8 2 Multicast Flooding ...
Page 183: ...183 Figure 4 8 14 IGMP Snooping VLAN Configuration Page Screenshot ...
Page 189: ...189 Figure 4 8 17 MLD Snooping Groups Information Page Screenshot ...
Page 208: ...208 Figure 4 9 6 QoS Egress Port Tag Remarking Page Screenshot ...
Page 218: ...218 Deletes the QCE The lowest plus sign adds a new entry at the bottom of the list of QCL ...
Page 229: ...229 Figure 4 9 18 Voice VLAN Configuration Page Screenshot ...
Page 299: ...299 Figure 4 11 17 Add User Properties Screen Figure 4 11 18 Add User Properties Screen ...
Page 336: ...336 Figure 4 14 2 LLDPMED Configuration Page Screenshot ...
Page 357: ...357 Figure 4 15 4 VeriPHY Cable Diagnostics Page Screenshot ...
Page 367: ...367 ...
Page 391: ...391 ...