Solution

In RIP-1, there is no workaround for this problem because RIP-1 is a classful routing protocol. RIP-1 automatically summarizes any update to a natural class boundary when that update goes over an interface configured with a different major network.

As indicated by R2's routing table in Example 3-100, 155.155.155.0/24 is advertised over an interface configured with 131.108.0.0. This summarizes 155.155.155.0/24 to a Class B boundary as 155.155.0.0/16.

In RIP-1, this is not a problem because RIP-1 is a classful protocol and the network should be designed with this understanding. With RIP-2, however, Cisco routers can be configured to stop the autosummarization process.

For example, R1's configurations can be changed to run a RIP-2 process rather than a RIP-1 process. Example 3-101 shows the configuration that solves this problem for RIP-2.

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