GarrettCom MNS-6K 4.1.4 - Manual (Page 221)

M A G N U M 6 K S W I T C H E S , M N S - 6 K U S E R G U I D E
With IGMP-L2 enabled on all Magnum 6K family of switches, this situation as shown above is
prevented. This is explained in the figure below.
R1 R2
R3 R4
R5 R6
T1 T1
T2 T2 L2 Mode
L2 Mode
L2 Mode
L2 Mode
F IGURE 121 - Using IGMP-L2 on Magnum 6K family of switches, a Layer 2 network can minimize multicast
traffic as shown above. Each switch has the IGMPL2 turned on. Each switch can exchange the IGMP query
message and respond properly. R4 wants to view surveillance traffic from T1. As shown by (1), a join request is
sent by R4. Once the join report information is exchanged, only R4 receives the video surveillance traffic, as shown
by (2). No other device on the network gets the video surveillance traffic unless they issue a join request as well.
220