Extending IP Addresses
87
To come up with the summary mask, count all the bolded bits as ones.
Because eight bits are boldface in the first octet and five bits in the second,
we'll get this:
255.248.0.0
Route Summarization Example 3
This example will show you how to summarize 172.16.16.0 through
172.16.31.0. First, let's put the network addresses into binary and then line
up the bits.
172.16.16.0
10101100.0001000.00010000.00000000
172.16.17.0
10101100.0001000.00010001.00000000
172.16.18.0
10101100.0001000.00010010.00000000
172.16.19.0
10101100.0001000.00010011.00000000
172.16.20.0
10101100.0001000.00010100.00000000
172.16.21.0
10101100.0001000.00010101.00000000
172.16.22.0
10101100.0001000.00010110.00000000
172.16.23.0
10101100.0001000.00010111.00000000
172.16.24.0
10101100.0001000.00011000.00000000
172.16.25.0
10101100.0001000.00011001.00000000
172.16.26.0
10101100.0001000.00011010.00000000
172.16.27.0
10101100.0001000.00011011.00000000
172.16.28.0
10101100.0001000.00011100.00000000
172.16.29.0
10101100.0001000.00011101.00000000
172.16.30.0
10101100.0001000.00011110.00000000
172.16.31.0
10101100.0001000.00011111.00000000
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