Cisco Cisco Aironet 340 Ethernet Bridges Guia Do Utilizador

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If there is heavy traffic between LAN A and LAN B, it would be more 
efficient to have Bridge 1 become the root with the port on Bridge 3 
being disabled. 
Figure 8.3 -  Alternate Root Bridge Arrangement
LAN A
LAN C
LAN D
LAN B
Bridge 1
Bridge 3
Bridge 4 (Root)
Port disabled
by STP
Bridge 2