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Configuring Routing Information Protocol
RIP Configuration Task List
IPC-210
Cisco IOS IP Configuration Guide
Example 2: Incorrect Configuration
The following example shows an illegal use of the ip summary-address rip router configuration
command, because both addresses to be summarized have the same major network. Each route
summarization on an interface must have a unique major network, whether or not the addresses have
unique address masks.
Router(config)# interface ethernet1
.
.
.
Router(config-if)# ip summary-address rip 10.1.0.0 255.255.0.0
Rotuer(config-if)# ip summary-address rip 10.2.0.0 255.255.255.0
Split Horizon Examples
Two examples of configuring split horizon are provided.
Example 1
The following configuration shows a simple example of disabling split horizon on a serial link. In this
example, the serial link is connected to an X.25 network.
interface serial 0
encapsulation x25
no ip split-horizon
Example 2
In the next example, Figure 35 illustrates a typical situation in which the no ip split-horizon interface
configuration command would be useful. This figure depicts two IP subnets that are both accessible via
a serial interface on Router C (connected to Frame Relay network). In this example, the serial interface
on Router C accommodates one of the subnets via the assignment of a secondary IP address.
The Ethernet interfaces for Router A, Router B, and Router C (connected to IP networks 12.13.50.0,
10.20.40.0, and 20.155.120.0, respectively, all have split horizon enabled by default, while the serial
interfaces connected to networks 128.125.1.0 and 131.108.1.0 all have split horizon disabled with the
no ip split-horizon command. Figure 35 shows the topology and interfaces.