Im trying to wrap my head around how TRILL removes the need to broadcast unknown unicast messages. The reason why redundant paths pose a problem in Ethernet is the broadcast nature of Ethernet. So how does TRILL work around that?
I know it leverages a routing protocol (IS-IS) to have RBridges learn of each others existence, but how does each RBridge know what MAC addresses are sitting behind each RBridge?
Example, RB1 receives a frame with an unknown MAC address, how does it find it where that MAC sits?
