Unknown unicast and flooding

[krish1986]

When switch receives unknown unicast, it will flood it out all ports except the receiving port of the frame. 1. How this is happening?

2. This will flood with a destination mac of FF:FF:FF:FF:FF:FF ?

3. And packet will not flood to the port where the unknown unicast packet come from?  How this is achieved?

[Joseph W. Doherty]

#1 the switch tracks what port the frame was received on, so it can avoid sending it back out that port. What else were you trying to understand with this question?

#2 This for an unknown unicast frame, correct? If so, the frame would have a unicast MAC for its destination MAC. (If floods the frame because it doesn't know what port that MAC might be reached via.)

#3 Another variation of your first question? Again, switch keeps track of what port the unknown unicast frame was receive upon.