BGP: Difference between revisions

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 = Synchronization =
- Do not Use or Advertize a route learned by iBGP unless the same has been learned by IGP as well.
+*Do not Use or Advertize to eBGP a route learned by iBGP unless the same has been learned by IGP as well.
- This is used to prevent the traffic form getting dropped by the intermediate routers.
+*This is used to prevent the traffic form getting dropped by the intermediate routers, a method of circumventing black-holes in transit networks.
+*This rule requires the redistribution of the BGP routes into the IGP in order to validate via the IGP.
+*But this is non scalable due to size of Internet Routing Table therefore is disabled by default(since 12.2).
+*To prevent black-holes in transit networks, iBGP needs to be run on all routers since BGP only can handle this amount of prefixes.
 = Auto-Summarization =