Cisco Cisco Aironet 340 Ethernet Bridges Guia Do Utilizador

The root bridge in turn will include a flag in all the configuration mes-
sages it sends.This flag will be propagated through the infrastructure by 
all the other bridges. After a time period the root bridge will clear the 
flag. This instructs all bridges to return to the normal aging timeout.

The STP protocol is implemented on the Aironet 340 Series Bridge as
follows.

n Each root bridge, with all of its repeaters, looks to other bridges in 

the infrastructure as a single multi-port bridge with a bridge address 
equal to the infrastructure address of the root bridge.

n The STP protocol runs only on the root bridge, not on repeaters. 

Repeaters only transmit packets or change state on commands from 
the root bridge.

n To reduce radio traffic, the repeaters will continue to transmit con-

figuration messages at the timeout period without having to be told 
to transmit each one by the root bridge. They will also only send 
received configuration messages back to the root bridge if they are 
different from the previously received message.

n When a repeater is not associated to a parent bridge, it will put its 

LAN port in the blocked state and will not forward any data to or 
from the port. Once associated, the root bridge will take control.

n The protocol parameters are all configured from the root bridge. The 

local port parameters are configured on each repeater bridge.