Hello Remi, Regarding your query, >Wouldn't this duplicate BUM traffic? In this situation I would try a setup with >trunk(4) for the uplinks. At least the failover mode should work if your >switches have a limited feature set.
Yes the scenario where you put 2 uplinks into a bridge would potentially duplicate Broadcast, Unknown Unicast, & Multicast Traffic, as per a standard Layer2 switch, but you have the advantage, that if a port goes down and the mac is removed from the bridge Fib, the frame is briefly flooded until the mac is learned via the other layer2 path, so Unknown Unicast is the exception rather than the rule (thankfully) Broadcast / Multicast Traffic is usually small Conversely if you use a Trunk in fail over mode it will favor the primary interface until it goes down,so the primary would be used as-long as the interface is up even if the switch that primary is attached to has lost its up-link, All that being said the Feature that MPI (thanks for putting the time into) improves security and ease of configuration of Protected ports in a Bridge. and it in its self will actually Limit Broadcast / Multicast / unknown Unicast flooding in most cases (except for a Redundant Layer 2 Uplinks into the same Bridge) I Hope this helps Tom Smyth
