Autonomous Systems
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many routes, then taking the time to manually configure these static routes
can become burdensome.
F I G U R E 7 . 2
A stub AS
In this situation, where there are many routes through the network, you
have some choices. You can maintain static routes, use an IGP to determine
the network topology and choose the most efficient paths between the AS
and the service provider, use eBGP between the customer and the local ser-
vice provider, or use any combination of these, as shown in Figure 7.3.
F I G U R E 7 . 3
A stub AS to an ISP
Stub AS
Local Service Provider
Intranet
3
4
1
2
IGP
Static
eBGP
IGP
eBGP
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