Sources of Routing Updates
Routes can be injected dynamically or statically into BGP. The choice of method depends on the number and stability of routes.
Injecting Information Dynamically into BGP
The following example demonstrates how routing information can be injected dynamically into BGP. Consider Figure 11-4.
Figure 11-4. Injecting Routes into BGP
Assume that AS3 is getting Internet connectivity from AS1. AS3 is running OSPF as an IGP inside the AS and is running EBGP with AS1.
On the other hand, AS3 also has one customer, C1, with the following criteria:
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C1 is pointing a default toward AS3.
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C1 advertises all its routes to AS3 ...
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