Extending IP Addresses
85
were receiving only a summary route (i.e., 172.16.0.0/16), then it wouldn't
have to be concerned with our work on one particular subnet.
We will get the most benefit from route summarization when the net-
works or subnetworks that we are summarizing are contiguous. To illustrate
this point, let's look at an example.
Route Summarization Example 1
We have the following networks that we want to advertise as a single sum-
mary route:
172.16.100.0/24
172.16.101.0/24
172.16.102.0/24
172.16.103.0/24
172.16.104.0/24
172.16.105.0/24
172.16.106.0/24
To determine what the summary route would be for these networks, we
can follow a simple two-step process.
1.
Write out each of the numbers in binary, as shown in Table 3.14.
T A B L E 3 . 1 4
Summary Example
IP Network Address
Binary Equivalent
172.16.100.0
10101100.0001000.01100100.0
172.16.101.0
10101100.0001000.01100101.0
172.16.102.0
10101100.0001000.01100110.0
172.16.103.0
10101100.0001000.01100111.0
172.16.104.0
10101100.0001000.01101000.0
172.16.105.0
10101100.0001000.01101001.0
172.16.106.0
10101100.0001000.01101010.0
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