One of Acorn's examples is a network like this:
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BACKBONE (1) ========+========+======== [FILESERVER (1.254)] | | BRIDGE BRIDGE | | Net 2 ------------+ +----------- Net 3
The DIP switches on the bridges only identify their "A" and "B" networks. So the bridges would know by means of the switches that 2.nnn and 3.nnn can reach 1.254 in a single hop.
But how does Net 2's switch know that by going over the Backbone, it can reach Net 3?
It strikes me that knowing Acorn it's probably a very simple solution, but the only solutions I came up with were indiscriminate broadcast with network number rewriting, and some kind of RIP broadcast system.
What is the logic inside the bridge?