This image shows an example deployment tree to illustrate the RCA flow. It has two columns, each containing the following connected sequence:
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A provider edge router (PE1 in the first column and PE2 in the second column)
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A customer edge router (CE1 and CE2)
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A distribution switch (DSW1 and DSW2)
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An access switch (ASW1 and ASW2)
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Two customer machines, represented as a laptop and a printer (CM1 and CM2 in the first column, CM3 and CM4 in the second column)
All of the devices marked with 1 are connected to each other, top to bottom, and all of the devices marked with 2 are connected to each other, top to bottom. Also, to indicate high-availability, some connections cross columns: the two distribution switches are connected to each other, and each distribution switch is connected to both access switches.