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Spanning Tree Discussion B - 3
Figure B-1. Spanning Tree Network Architecture
When a bridge is installed into a network, it assumes that it is the root of
the network until it is told otherwise. We will call this bridge BRIDGE_3.
Thinking it is root, BRIDGE_3 transmits packets onto all the networks to
which it is connected, letting adjacent bridges know that it believes it is
root. If an adjacent bridge sees that there is a bridge more deserving of
the title root bridge of the Spanning Tree (i.e., having a lower “bridge
address”), that bridge will inform BRIDGE_3 and it will no longer claim to
be root.
BRIDGE_3 has another chance to enter the hierarchy by becoming one of
the designated bridges. Each LAN has a designated bridge whose role is to
transfer information between that LAN and the root. BRIDGE_3 asks all
the adjacent bridges, except those on its root port, whether it can become
the designated bridge for any of those neighbor's LANs. If BRIDGE_3 is
closer to the root than any of the neighboring bridges on a particular LAN,
then it will become the designated bridge for that LAN. BRIDGE_3 is the