Confederations
For the scenario in Figure 12-14, you want to divide AS3 into two smaller sub-ASs, AS65050 and AS65060. The AS numbers of the sub-ASs are chosen from within the private AS pool range of 64512 to 65535. OSPF is used as the IGP in each sub-AS. The OSPF within AS65050 is running independently of the OSPF in AS65060, which means that the area numbers used in AS65050 can be reused in AS65060. This takes advantage of one of the benefits of BGP—namely, that IGPs in one AS run independently of IGPs in other ASs.
Figure 12-14. Confederations
The configuration for RTA in Example 12-73 shows that RTA has all its interfaces in OSPF ...
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