Netgear GS728TP100NAS 사용자 설명서

Multicast

IP Multicasting enables a network host (or multiple hosts) to send an IP datagram to multiple 
destinations simultaneously. The initiating host sends each multicast datagram only once to a 
destination multicast group address, and multicast routers forward the datagram only to hosts 
who are members of the multicast group. Multicast enables efficient use of network 
bandwidth because each multicast datagram needs to be transmitted only once on each 
network link, regardless of the number of destination hosts. Multicasting contrasts with IP 
unicasting, which sends a separate datagram to each recipient host. The IP routing protocols 
can route multicast traffic, but the IP multicast protocols handle the multicast traffic more 
efficiently with better use of network bandwidth.

You use the IPv4/IPv6 multicast feature on the ProSafe managed switch to route multicast 
traffic between VLANs on the switch. If all hosts connected to the switch are on the same 
subnet, there is no need to configure the IP/IPv6 multicast feature. If the switch does not 
handle L3 routing, you can use IGMP snooping or MLD snooping to manage port-based 
multicast group membership. For more information, see 

158. If the 

local network does not have a multicast router, you can configure the switch to act as the 
IGMP querier. For more information, see 

163.

If the switch is configured as a layer-3 switch and handles inter-VLAN routing through static 
routes, OSPF, or RIP, and multicast traffic is transmitted within the network, enabling and 
configuring layer-3 multicast routing on the switch is recommended. 

From the Multicast link, you can access the following pages: