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Chapter 9
BGP Scalability and Advanced Features
Identify both of the route reflector's neighboring routers and the AS
they reside in.
Assign an IGP. (We will use OSPF with the ASN of 10 and assign all
the routers in the internal AS to Area 1.)
Configure multi-homing on RouterB using the links to the two-ISP
number router and configure ISP Router #1 as the primary link.
Assign an administrative distance of 100 to one link to the ISP and 150
to the other.
Configure RouterA as the route reflector, making RouterB and
RouterC clients.
Let's now look at an example of the configuration of all three routers,
which are identified by the hostname on each router. We'll start with
RouterA:
RouterA(config)#router bgp 7501
RouterA(config-router)#network 172.16.0.0 mask 255.255.0
RouterA(config-router)#network 10.0.0.0 mask 255.0.0
RouterA(config-router)#neighbor 172.16.11.254 remote-as
7501
RouterA(config-router)#neighbor 172.16.11.254 route-
reflector-client
RouterA(config-router)#neighbor 172.16.12.254 remote-as
7501
RouterA(config-router)#neighbor 172.16.11.254 route-
reflector-client
RouterA(config-router)#exit
RouterA(config)#router ospf 10
RouterA(config-router)#network 172.16.0.0 0.0.255.255 area 0
RouterB(config-router)#default-information originate
always
RouterA(config-router)#exit
RouterA(config)#interface ethernet 0
RouterA(config-if)#ip address 172.16.10.1 255.255.255.0
RouterA(config-if)#no shut
RouterA(config-if)#interface serial 0
RouterA(config-if)#ip address 172.16.12.1 255.255.255.0
RouterA(config-if)#no shut
RouterA(config-if)#exit
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