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Configuring IP Unicast Routing
Configuring RIP
DETAILED STEPS
To enable the split horizon mechanism, use the ip split-horizon interface configuration command.
EXAMPLE
The following simple example disables split horizon on a serial link:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface serial 0
Switch(config-if)# no ip split-horizon
Switch(config-if)# end
Configuring Summary Addresses
To configure an interface running RIP to advertise a summarized local IP address pool on a network access server for
dial-up clients, use the ip summary-address rip interface configuration command.
Note: If split horizon is enabled, neither autosummary nor interface IP summary addresses are advertised.
BEFORE YOU BEGIN
If the interface is in Layer 2 mode (the default), you must enter a no switchport interface configuration command before
entering the ip address interface configuration command.
Command Purpose
1. configure terminal Enter global configuration mode.
2. interface interface-id Enter interface configuration mode, and specify the interface
to configure.
3. no shutdown Enable the interface if necessary. By default, UNIs and ENIs
are disabled and NNIs are enabled.
4. ip address ip-address subnet-mask Configure the IP address and IP subnet.
5. no ip split-horizon Disable split horizon on the interface.
6. end Return to privileged EXEC mode.
7. show ip interface interface-id Verify your entries.
8. copy running-config startup-config (Optional) Save your entries in the configuration file.
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