In reading about Spanning Tree, I am confused about BPDU traffic. Once
a root is selected, do all switches still send BPDUs out all
interfaces? I know that redundant links are put in a blocking state so
that no traffic is sent or received. I am reading Webb's BCMSN book by
Cisco Press and it states that "Receiving BPDUs on multiple ports
indicates that it has a redundant path to the root bridge". This seems
to indicate that only the root is sending BPDUs. Later, it says "Those
ports placed in a blocked state will continue to send and receive BPDU
information but will not be allowed to send or receive data." These two
statements seem contradictory in the fact that it seems you could
receive BPDUs from a neighboring switch port that is blocked but still
sending BPDUs, and also receive BPDUs from the root, so that you are
receiving multiple BPDUs but there is no loop. Could someone please
explain how this works to me?
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