QuestionQ137

Routing Policy and Manipulation

For what reason are BGP confederations deployed within a BGP transit backbone?

  • A to support a larger number of eBGP peer sessions
  • B to increase the number of routes that can be redistributed between the running IGP and BGP
  • C to reduce the number of eBGP routes that must be shared between autonomous systems
  • D to reduce the number of iBGP peering sessions
Explanation

BGP confederations improve iBGP scalability by splitting a large autonomous system into smaller sub-autonomous systems, reducing the iBGP full-mesh peering-session requirement.

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