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Alteon OS Application Guide
Chapter 12: OSPF
21142C4911, January 2007
Example 3: Summarizing Routes
By default, ABRs advertise all the network addresses from one area into another area. Route
summarization can be used for consolidating advertised addresses and reducing the perceived
complexity of the network.
If the network IP addresses in an area are assigned to a contiguous subnet range, you can con-
figure the ABR to advertise a single summary route that includes all the individual IP
addresses within the area.
The following example shows one summary route from area 1 (stub area) injected into area 0
(the backbone). The summary route consists of all IP addresses from 36.128.192.0 through
36.128.254.255 except for the routes in the range 36.128.200.0 through 36.128.200.255.
Figure 12-7 Summarizing Routes
NOTE – You can specify a range of addresses to prevent advertising by using the hide option. In
this example, routes in the range 36.128.200.0 through 36.128.200.255 are kept private.
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