Traffic Flows

In the steady state when all the ports are enabled, the MLAG (Multi-switch Link Aggregation Group) blocking rule prevents traffic coming from the ISC port to be forwarded to its MLAG ports. So, in steady state, any unknown (unknown unicast/broadcast/multicast) traffic from Switch-1 to Switch-2 over ISC-1 will not be flooded to “blue” and “orange” MLAG ports on switch-2. However, since the “green” MLAG port on switch-2 does not correspond to ISC-1, the traffic from ISC-1 will be forwarded to “green” MLAG port as shown in the following illustration:
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Traffic Flow
In steady state, the unknown traffic from Switch-3 to Switch-2 over ISC-2, will be blocked to “green” MLAG ports. However, this traffic will be sent to “blue” and “orange” MLAG ports.
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Traffic Flow (Unknown Traffic Switch-3 to Switch-2)