>From the Cat5k ver 5.2 document set... configuring spanning tree... there's
a section on how spanning tree works in all 5 port states...and what the
port actually does during those 5 states.
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/rel_5_2/config/s
pantree.htm
----- Original Message -----
From: Brian M. Green <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, March 19, 2001 12:46 PM
Subject: Spanning Tree
> 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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