Cisco Cisco Aironet 340 Ethernet Bridges Guía Del Usuario
8 - 8 Aironet 340 Series Bridge
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.
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.
Implementing STP Protocol
The STP protocol is implemented on the Aironet 340 Series Bridge as
follows.
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.
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.
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.
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.
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.