The other day I was delving a bit into spanning tree and I came across
something that puzzled me.

Searching out which device was the root bridge I found the MAC address (BID)
on the root bridge to be all zero's.  (show spantree snippets).

Spanning tree mode          PVST+
Spanning tree type          ieee
Designated Root             00-00-00-00-00-00
Bridge ID MAC ADDR          00-00-00-00-00-00

Without finishing chapter 7 (Spanning Tree) in my LAN switching book I am
puzzled as to whether this is a preset MAC address or self assigned.

Any thoughts?  Why or how did this occur?

Kim




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