Exterior Gateway Protocol (EGP)

• A mechanism that allows non-core routers to learn routes from core routers so that they can choose optimal backbone routes

• A mechanism for non-core routers to inform core routers about hidden networks

• Autonomous System (AS) has the responsibility of advertising reachability info to other ASs.

  • One or more routers may be designated per AS.
  • Important that info propagates to core routers

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