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· First the src
stn. Transmits the single route broadcast frame on its LAN without the route
designator field.
· this frame should
appear exactly once and hence selected bridges form spanning tree
· Once the
selected bridge at the first hop receives this frame
§ inserts an
incoming LAN number
§ bridge number
§ outgoing LAN
number in the routing information field
· Then forwards on
outgoing LAN
· At the other hop
when a selected bridge receives this frame inserts bridge number and outgoing
LAN number and forwards on outgoing LAN
· Non selected
bridge simply ignore this frame
· Once the
receiver gets this frame it broadcasts all routes broadcast frame with no route
designator fields
· This frame
generates all possible routes back to the src stn
· After collecting
all routes the source station selects the best route and saves it
· To prevent all
routes broad cast frames from circulating in the network, the bridge first
checks whether the outgoing LAN number is already recorded, if so it does not
forward the frame
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