Why does an ABR advertise continuous network segment addresses of an area as a summary address

Perform the following steps to solve this problem:

1. Run the display current configuration command to check whether the network segment addresses of the area are continuous.
2. If the network segment addresses are discontinuous, divide them into several groups of continuous network segment addresses.
3. Run the abr-summary command to summarize each group of continuous networks into a single network on the area border router (ABR).
4. In area view, run the filter export command and ensure that the link-state advertisements (LSAs) summarized by the ABR are not filtered out.

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