BGP

Jan 16, 2011

RFC1771 – you have control only over your AS, you cannt tell other AS how to route traffic passing through (attributes).

Neighbor relationship;

  • Neighbors start in IDLE
  • 1st Stage: ACTIVE
  • 2nd Stage: OPEN SENT
  • 3rd Stage: OPEN CONFIRMED
  • 4th Stage: ESSTABLISHED

Hello messages sent every 60 sec and holddown timer as 180 sec

Authentication is MD5

Rule of syncronisation – Routes learnt by BGP must be validated by the interior routing table before they can be advertised to remote peers.

BGP SPlit Horizon – Routes learned via iBGP will never be sent to another iBGP peer (this is where route reflectors come into play).

Rob Edwards

Northern (UK) chap focusing on platforms, automation, cloud and cloud native applications. Recovering network engineer, although it turns out networking is as important, if not more, now than before!

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