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MAGNUM 6K SWITCHES, MNS-6K USER GUIDE
For a Layer 2 IGMP environment, all Magnum 6K family of switches have to be enabled in the
IGMP-L2. This is done using the CLI command 'set igmp mode=l2' which will be described
later.
In a Layer 2 network, without IGMP-L2, there is no querier nor is there any capability for the
devices to use IGMP snooping to join a multicast group. Thus - the traffic picture from a
multicast device would look as shown below.
FIGURE 115 - In a Layer 2 network, an IGMP multicast traffic goes to all the nodes. In the figure, T1, a
surveillance camera, using multicast, will send the traffic to all the nodes - R1 through R6 - irrespective of whether
they want to view the surveillance traffic or not. The traffic is compounded when additional cameras are added to
the network. End result is that users R1 through R6 see the network as heavily loaded and simple day to day
operations may appear sluggish.
R1 R2
R3 R4
R5R6
T1T1
T2T2
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.
200