What Is Automatic Summarization?
Auto-summarization, which summarizes the network in the direction that one router travels to another router, that is, it summarizes to the main network. It can also be said that the IP addresses to be announced to participate in a process are stored in the router's routing table according to the main network number. For example, in the configuration examples of continuous or discontinuous subnets, without considering subnet division, etc., in the same intranet, the IP addresses of peripheral hosts (such as 192.168.1.1) with the same network number (such as 192.168.1.0) and The process of accessing the IP address of the Ethernet interface (such as 192.168.1.254) is automatically summarized by the router's RIP protocol Version1 or Version2 into the primary network number (192.168.1.0).
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- Auto-summarization, which summarizes the network in the direction that one router travels to another router, that is, it summarizes to the main network. It can also be said that the IP addresses to be announced to participate in a process are stored in the router's routing table according to the main network number. For example, in the configuration examples of continuous or discontinuous subnets, without considering subnet division, etc., in the same intranet, the IP addresses of peripheral hosts (such as 192.168.1.1) with the same network number (such as 192.168.1.0) and The process of accessing the IP address of the Ethernet interface (such as 192.168.1.254) is automatically summarized by the router's RIP protocol Version1 or Version2 into the primary network number (192.168.1.0).
- In RIPVersion1, routing packets do not have a subnet mask, and can only be identified by the primary network number. Moreover, in networks in discontinuous subnets, routing entries will automatically perform route summarization at the edge of the network [1] .
- In the configuration of RIP for continuous subnets, the edge router selects the RIP protocol Version1 or Version2 and announces the main network by RIP. It will not affect the hosts on this subnet to ping the IP address of the host on the other subnet across the router (network). It is equivalent to accessing another host in the same intranet.
- In the RIP configuration of discontinuous subnets, if the RIP protocol of the edge router is RIPVersion1 (RIP protocol version 1), and only the main network is declared when the network participating in the RIP process is announced. Because it is a classful routing protocol and you cannot turn off auto-summarization, you cannot ping the IP address of the host on the other subnet across the router (net) of the subnet. Because at the network boundary of discontinuous subnets, routing summary will cause the loss of routing protocols [1] .
- In the RIP configuration of discontinuous subnets, if the RIP protocol of the edge router is RIPVersion2 (RIP protocol version 2), and only the main network is declared when the network participating in the RIP process is announced. Because it is a classless routing protocol, you can turn off auto-summarization (by using the command no auto-summary in the RIP protocol mode), so you can ping the hosts on this subnet across the router (net) to ping the IP address of the host on the other side.