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• CSMA/CD community preferred to
use transparent bridges due to their simplicity.
• The Token Ring community,
however, preferred source routing bridges.
• In source routing, the sending
station knows whether the destination is on the same network. If it is not, the
sender sets the higher destination address bit to 1 and includes the exact path
to the frame header.
• The path is a sequence of
alternating bridge and LAN addresses (4bits/12bits).
• This requires that each machine
know the topology and can construct a path to any receiver.
• Instead, the sender first
broadcasts a discovery frame asking the receiver to signal himself. In
the return trip bridges record their addresses in the frame header and the path
is formed.
• Problem: Too many frame loose in the network.
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