Information Technology Reference
In-Depth Information
Figure 5-21
Network Topology with the BGP Core
Location B
R7
R8
Location A
Location C
R5
R6
R1
BGP 65101
BGP 65103
R10
R4
R9
R2
BGP 65104
R11
BGP 65104
R3
Frame Relay
Cloud
BGP 65105
BGP 65105
R12
R13
Remote Sites
Core Design
The new network core in this topology consists of four routers—R4, R5, R6, and R10. The
core itself is built using iBGP, with a full mesh between these routers. The peering sessions
are sourced from the loopback interfaces. A core EIGRP AS is configured only on these
four routers to provide reachability between the loopback interfaces. Each iBGP session
is configured with
next-hop-self
to remove the need to carry the prefixes for the DMZ
Ethernet segments. The BGP AS for the network core is 65100. The core issues a default
route to major centers and the remote site aggregation routers.
