Milan Technology MIL-SM2401M Manuale Utente

Pagina di 132
                 101
 
5-4-6. Forwarding and Filtering
 
5-4-6-1. IGMP Snooping
 
 
 
The switch supports IP multicasting.  You can enable IGMP via the web 
management’s configuration screen. In addition, you can view different 
multicast groups, VIDs and member ports, and IP multicast addresses that 
range from 224.0.0.0 through 239.255.255.255. 
 
The Internet Group Management Protocol (IGMP) is an internal protocol of 
the Internet Protocol (IP) suite.  IP manages multicast traffic by using 
switches, routers, and hosts that support IGMP. Enabling IGMP allows the 
ports to detect IGMP queries and report packets and manage IP multicast 
traffic through the switch. IGMP has three fundamental types of messages. 
 
 
Message Description 
Query  A message sent from the querier (IGMP router or switch) asking 
for a response from each host belonging to the multicast group. 
Report  A message sent by a host to the querier to indicate that the host 
wants to be or is a member of a given group indicated in the report 
message. 
Leave 
Group 
A message sent by a host to the querier to indicate that the host 
has quit to be a member of a specific multicast group.