Interior BGP vs. Exterior BGP

• Interior BGP (iBGP)

  • Between routers in the same AS
  • Often between routers that are far apart
  • Should be a full mesh: every iBGP router talks to all other iBGP routers in the same AS

• Exterior BGP (eBGP)

  • Between routers in different ASes
  • Almost always between directly-connected routers (ethernet, serial line, etc.)

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