Planet Technology Planet Intelligent Gigabit Ethernet Stackable/Routing Switch WGSW-2402A - Manual (Page 77)

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2. Enter a decimal number in the Enter New PVID column. Then press Enter.
F IGURE 5-26
Note: Even though you have specified the port to be tagged port for the VLAN ID, the Switch will still
untagged the packets if the PVID setting is the same as the VLAN ID. If your network is with
multiple switches, organize the VLAN groups before setting up the VLAN ID of the ports.
5.3 IP Multicast Group Perspective
The Internet Group Management Protocol (IGMP) runs between hosts and their immediately
neighboring multicast routers. The protocol’s mechanisms allow a host to inform its local router that it
wants to receive transmissions addressed to a specific multicast group.
Routers periodically query the LAN to determine if known group members are still active. If there is
more than one router on the LAN performing IP multicasting, one of the routers is elected “querier” and
assumes the responsibility of querying the LAN for group members. Based on the group membership
information learned from the IGMP, a router can determine which (if any) multicast traffic needs to be
for-warded to each of its “leaf” subnetworks. Multicast routers use this information, along with a
multicast routing protocol, to support IP multicasting across the Internet.