Configure EBGP between R6 and BB3. R6 will be AS 100 and the BB3 router AS is 300. R6 will receive updates for networks 200.20.X.0 and 198.18.X.0, where X is any number.
See Figure 5-11.
Figure 5-11. BGP Boundaries Between the Autonomous Systems
Configure IBGP between R2, R3, and R6; use AS 100. R2 should not peer direct to R6. R2 and R3 should be able to see all BGP BB3 routes in their routing tables. Refer to Figure 5-11. Use the loopbacks to make up your peers.
Configure R2 such that all BGP routes learned from R3 will have weight 40000.
