Information Technology Reference
In-Depth Information
•
Follow the design guidelines presented in Chapter 7 on how to design a route reflector
(RR) or confederation-based architecture.
•
Schedule migration during maintenance windows. Migrate one point of presence
(POP) during one maintenance window to minimize risks.
•
Prepare a detailed backout-and-restore procedure in the event that migration cannot
be completed.
Identifying the Starting and Final Network Topologies
Three types of network topologies are used in this chapter:
•
iBGP full mesh
•
Route reflection
•
Confederation
Depending on the case study, one of the three topologies is used as the starting topology
(before the migration). The final topology (after the migration) is either route reflection or
confederation, depending on the case study. Consult Chapter 7 on when to use route reflec-
tion versus confederation to increase iBGP scalability.
Figure 8-1 shows the iBGP full-mesh topology. Within AS 100, seven routers simulate two
POPs. The left POP has R1, R2, and R3, and the right POP has R4, R5, R6, and R7. The
core routers are R1, R2, R4, and R5. An external peering is simulated between R1 and R8.
All routers in AS 100 peer with each other in a full iBGP mesh.
Figure 8-1
BGP Full-Mesh Topology
AS 200
R8
172.16.0.0/16
AS 100
192.168.200.0/24
R1
R4
R6
192.168.201.0/24
192.168.202.0/24
R3
R2
R7
R5
