38
Figure 4-24 Radius configuration
Step 3
Click
Add New Server
, enter server address, authorized port and key in the pop-up
window.
Figure 4-25 Add new server
Step 4
Click
Save
.
5.7 IGMP Snooping
IGMP Snooping (Internet Group Management Protocol Snooping) is operated on the layer two
device. It can generate layer two multicast forwarding table by snooping the IGMP message
between layer three device and host, which is to manage and control the forwarding of multicast
data message and realize required distribution on layer two of multicast data packet.
5.7.1 IGMP Snooping Theory
Operating layer two device of IGMP Snooping can establish mapping relation for port and MAC
multicast address through analysis on received IGMP message, and forward multicast data according
to the mapping relation.
The multicast data will be broadcasted in the layer two network when the layer two device does not
operate IGMP Snooping. After layer two device operates IGMP Snooping, the known multicast data
of multicast group will not be broadcasted in the layer two network but multicasted to designated
