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