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Cyclades-PR4000
Chapter 11 - Routing Protocols 104
The last option is to aggregate the addresses contained in the local autonomous system in order to present an
aggregated route to the outside world. This is done in the last step.
8. Aggregate the addresses contained in the AS.
The steps defined above will now be clarified.
STEP ONE
The global parameters apply to the router’s AS. Classless Inter-Domain Routing (CIDR) Address notation is used
instead of the normal IP Address and Subnet mask notation. Both are shown in Figure 12.4.
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Tele Brutus
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Tele Popeye
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100.100.100.2
100.100.100.1
200.200.200.2
AS 310
200.200.200.1
200.50.51.0
200.50.50.0
AS 747
AS 100
255.255.255.0
255.255.255.0
200.50.51.0 / 24
200.50.50.0 / 24
PR3000
PR3000
PR3000
FIGURE 12.4 EXAMPLE SYSTEM WITH PR3000 IN AS 100 BEING CONFIGURED