Practical BGP

Chapter 4

1:	Why do iBGP peers only advertise routes learned from other iBGP peers to eBGP peers?
A1:	To prevent routing loops; BGP relies on the AS Path to prevent routing and forwarding loops, and the AS Path does not change within an autonomous system.
2:	In a network with 100 iBGP peers, fully meshed, with a single peer receiving 1000 routes from an eBGP peer, how many routes would each iBGP peer receive and store?
A2:	100 peers × 1000 routes, so each peer would receive and store 100,000 routes. Each iBGP speaker would only use 1000 of these routes, however, since there are actually only 1000 reachable destinations, or prefixes.
3:	If a route reflector receives a route from a nonclient peer, which peers would the route be reflected to?
A3:	The ...