Can someone tell me if there is a specific destination mac address that the configuration bpdu's sent by the root bridge are destined to please? Just wondered if it was a unicast, multicast or broadcast. As I understand it, they will only be forwarded out designated ports (i.e. not root or blocked/alternate ports). Makes sense for it to be a multicast, but I'm not entirely sure what that would be if im honest. Can someone elaborate?
If they are multicasted, can someone please also explain to me why/how the switch stops these bpdu's going out of blocked ports? Although blocked ports don't record mac addresses, it makes that irrelevant if the bpdu is sent as a multicast destination rather than unicast.
Thanks