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Chapter 9
BGP Scalability and Advanced Features
F I G U R E 9 . 4
A single static (default) route to an ISP
RouterA(config)#ip route 0.0.0.0 0.0.0.0 serial 0
RouterA(config)#router ospf 10
RouterA(config-router)#network 172.16.0.0 0.0.255.255 area 1
RouterA(config-router)#default-information ?
originate Distribute a default route
RouterA(config-router)#default-information originate ?
always Always advertise default route
metric OSPF default metric
metric-type OSPF metric type for default routes
route-map Route-map reference
<cr>
RouterA(config-router)#default-information originate
always
RouterA(config-router)#
You can configure static routes for multiple ISPs as well. In Figure 9.5, we
see that there are two ISP routers from two different ISPs. The primary link
uses a 1.544Mbps link; the other uses a 512Kbps link as a backup. We can
AS 10
S0
ISP Router
S0
RouterA
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