Small size routing updates consume less bandwidth. But when it advertised with the summarization, it had to advertise only one route. As you can see in our example, when router R0 advertised routes without the summarization, it had to advertise four routes. Route summarization provides the following advantages. Router R1 will also receive a single summarized route and will add that route to its routing table.
#SUMMARY ROUTE CALCULATOR SERIAL#
The following image shows how this process works.īut if the route summarization feature is enabled, instead of advertising four contiguous routes separately, router R0 will advertise a single summarized route from the serial interface. Router R1 will receive these advertised routes on its serial interface and will add them to its routing table. If the route summarization feature is disabled, the router R0 will advertise these routes as they are. How router R0 will advertise these routes on the right side from the serial interface depends on whether the route summarization feature is enabled or not. Networks 192.168.1.0/30 and 192.168.1.4/30 are used to connect serial interfaces, respectively.įour subnets of the network 10.0.0.0 are connected to the left side of the router R0. R0's serial interface S0/0/0 is connected to R1's serial interface S0/0/0 and R1's serial interface S0/0/1 is connected to R2's serial interface S0/0/0. In this network, three routers R0, R1, and R2 are connected. The following image shows an example of this situation. In such a situation, the router automatically summarizes contiguous routes as a single classful network address. One such a condition is when the router sits between classful networks with some interface in one Class A, B, or C network and other interfaces in another Class A, B, or C network. In simple words, auto summarization is a state in which, under certain conditions, a routing protocol automatically uses the route summarization feature. If a routing protocol automatically creates a summary route, it is known as the auto-summarization.
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