What Is Automatic And Route Summarization

The process of taking a range of IP addresses and advertising them in one address block is known as summarization or route summarization. It allows routing protocol to advertise to many networks as one address. The purpose of this is to reduce the size of the routing table on the router to save memory.

There are two types of summarization

  1. Automatic Summarization             2) Manually

Example     

192.168.1.0/24    

192.168.2.0/24

192.168.3.0/24

192.168.4.0/24

192.168.5.0/24     (These are IP range, we have to find one address of advertising these range of IP address)

                             192              168              1                  0

                             192              168              2                  0

                             192              168              3                  0       

                             192              168              4                  0

                             192              168              5                  0

                        —————————————————————

                             8                 8                 ?                 0

You have to find out 3rd octet. We can solve this in binary format.

                   27      26      25      24      23      22      21      20

1                 0        0        0        0        0        0        0        1

2                 0        0        0        0        0        0        1        0

3                 0        0        0        0        0        0        1        1

4                 0        0        0        0        0        1        0        0

5                 0        0        0        0        0        1        0        1

                   1        1        1        1        1        0        0        0

(We did AND operation) all same values is 1’s and different values is 0’s

                   27      26      25      24      23      22      21      20

                   1        1        1        1        1        0        0        0       

                   128+ 64+   32+   16+   8

                   =248

                             192                  168                  1                      0

                             192                  168                  2                      0

                             192                  168                  3                      0         

                             192                  168                  4                      0

                             192                  168                  5                      0

                        —————————————————————

                             8                      8                      5                      0

So the address is 192.168.248.0. and CIDR value is 21 because we got 5 on a bit after solving the 3rd octet and we have 16 on bits from the 1st and 2nd octet.

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