Fundamentals of BGP Operations - Building the IP routing table - Adding IBGP Routes to the IP Routing table

6 important questions on Fundamentals of BGP Operations - Building the IP routing table - Adding IBGP Routes to the IP Routing table

What are the two requirements for adding iBGP to the routing table?

-The route must be the best BGP route
-The route must be the best route (according to AD) in comparison with other routing sources

How can you overcome the blackhole with BGP?

-Use sync and redistribute routes
-Disable sync and use bgp on all routers in an AS

What is the BGP synchronization rule?

The BGP synchronization rule states that if an AS provides transit service to another AS, BGP should not advertise a route until all of the routers within the AS have learned about the route via an IGP
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What BGP command can prevent problems related to IP routing and what will the command do?

synchronization
BGP routes will be redistributed in the routing protocol
Explanation: https://learningnetwork.cisco.com/thread/27562

What is the disadvantage of disabling sync and using BGP on all routers in an AS?

-BGP needs the full mesh of iBGP peers inside an AS because BGP does not advertise iBGP routes (N routers, N(N-1/2 neighbor connections required)
-BGP can degrade because of the large number of peers

What does BGP offer to reduce the number of peer connections inside an AS?

-Confederations
-Route-reflectors

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