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4.8 Multicast
4.8.1 IGMP Snooping
The
Internet Group Management Protocol (IGMP)
lets host and routers share information about multicast groups memberships.
IGMP snooping is a switch feature that monitors the exchange of IGMP messages and copies them to the CPU for feature
processing. The overall purpose of IGMP Snooping is to limit the forwarding of multicast frames to only ports that are a member of
the multicast group.
About the Internet Group Management Protocol (IGMP) Snooping
Computers and network devices that want to receive multicast transmissions need to inform nearby routers that they will become
members of a multicast group. The
Internet Group Management Protocol (IGMP)
is used to communicate this information. IGMP
is also used to periodically check the multicast group for members that are no longer active. In the case where there is more than
one multicast router on a sub network, one router is elected as the ‘queried’. This router then keeps track of the membership of the
multicast groups that have active members. The information received from IGMP is then used to determine if multicast packets
should be forwarded to a given sub network or not. The router can check, using IGMP, to see if there is at least one member of a
multicast group on a given subnet work. If there are no members on a sub network, packets will not be forwarded to that sub
network.
Figure 4-8-1:
Multicast Service
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 ...