What is being exchanged?

• IP Routes

  • A sends B routing advertisements

• IP Packets

  • B sends A IP packets destined to A’s advertised network’s

172.16.1.0/24

Route Advertisement of 172.16.1.0/24

passed from A to B, to C

A

B

C

Packet from D addressed to 172.16.1.1

passes from D to C, to B, to A for delivery

D

Direction of flow of route advertisement

Direction of flow of traffic

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