Configure the split-horizon Option

1. On switch 1, enter the configuration mode for the interface.

   SEFOS# configure terminal
   SEFOS(config)# interface vlan 1
   SEFOS(config-if)# exit
   

2. Enter the configuration mode for the router.

   SEFOS# configure terminal
   SEFOS(config)# router rip
   SEFOS(config-router)# network 10.0.0.1
   SEFOS(config-router)# exit
   

3. Enter the configuration mode for VLAN 1.

   SEFOS(config)# interface vlan 1
   

4. Enable the split-horizon option.

   SEFOS(config-if)# ip split-horizon
   

5. Review the configuration information.

   SEFOS# show ip protocols
    
   Routing Protocol is rip
    
   Vrf  default
    RIP2 security level is Maximum
    Redistributing : rip, bgp, connected, ospf, static
    Output Delay is disabled
    Retransmission timeout interval is 5 seconds
    Number of retransmission retries is 36
    Default metric is 3
    Auto-Summarisation of routes is disabled
    Routing for Networks :
      10.0.0.0
    Routing Information Sources :
    Interface Specific Address Summarization :
      40.0.0.0/8    for vlan1
    Trusted Neighors :
    Interface vlan1
     Sending updates every 60 seconds
     Invalid after 120 seconds
     Flushed after 120 seconds
     Send version is 1 2, receive version is 1 2
     Authentication type is none
     Split Horizon is enabled
     Installs default route received
     Restricts default route origination