1.what is bgp confederation?what are bgp state machines?what is NSSA in ospf?how AS-PATH looks like when route update comes out of bgp confederation?

Question

Accepted Answer

BGP confederation is a method to reduce the number of iBGP peers. BGP state machines are used to maintain BGP sessions. NSSA is a type of OSPF area. AS-PATH in BGP confederation is modified.

BGP confederation is used to split a large AS into smaller sub-ASes to reduce the number of iBGP peers.
BGP state machines are used to maintain BGP sessions and exchange routing information.
NSSA (Not-So-Stubby Area) is a type of OSPF area that allows external routes to be imported into the OSPF domain.
In BGP confederation, the AS-PATH is modified to include the sub-AS number of the confederation member that originated the route.

1.what is bgp confederation?what are bgp state machines?what is NSSA in ospf?how AS-PATH looks like when route update comes out of bgp confederation?

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