163
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is also used to periodically check the multicast group for members that are no longer active.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
Содержание NS3702-24P-4S
Страница 1: ...NS3702 24P 4S User Manual P N 1072832 REV 00 01 ISS 14JUL14 ...
Страница 65: ...65 Buttons Click to apply changes Click to undo any changes made locally and revert to previously saved values ...
Страница 102: ...102 Figure 4 5 4 LACP Port Configuration Page Screenshot ...
Страница 119: ...119 Figure 4 6 4 VLAN Membership Status for Static User Page Screenshot ...
Страница 124: ...124 Figure 4 6 6 Private VLAN Membership Configuration page screenshot ...
Страница 135: ...135 VLAN 3 Port 3 Port 6 The screen in Figure 4 6 18 appears Figure 4 6 17 Private VLAN Port Setting ...
Страница 140: ...140 Figure 4 6 21 Group Name to VLAN Mapping Table Page Screenshot ...
Страница 164: ...164 Figure 4 8 2 Multicast Flooding ...
Страница 184: ...184 Figure 4 8 15 MLD Snooping Port Group Filtering Configuration Page Screenshot ...
Страница 204: ...204 Figure 4 9 6 QoS Egress Port Tag Remarking Page Screenshot ...
Страница 209: ...209 QoS Class QoS Class value can be any of 0 7 DPL Drop Precedence Level 0 1 ...
Страница 251: ...251 Figure 4 11 3 Authentication Method Configuration Page Screenshot ...
Страница 286: ...286 Figure 4 11 11 RADIUS Server Configuration Screenshot ...
Страница 290: ...290 Figure 4 11 17 Add User Properties Screen Figure 4 11 18 Add User Properties Screen ...
Страница 298: ...298 non committed changes will be lost ...
Страница 349: ...349 Figure 4 16 2 PoE Configuration Screenshot ...
Страница 355: ...355 Figure 4 16 5 PoE Status Screenshot ...