Configuring RIP Split Horizon

Refer to the Section 3.1 for Configuration Guidelines and Figure Topology 1 for Testing iS5Com RIP for the Setup. The prerequisite configuration needs to be done in the switches (ISS 1 and ISS 2) before configuring RIP.

By default, split horizon with poison reverse will be enabled on all RIP interfaces.

Execute the following commands in the switch ISS 1 to configure RIP Split Horizon.
Type the following:
- Enter the Global Configuration Mode in ISS 1.
```
iS5comm# configure terminal
```
- Enable RIP globally in the switch ISS 1.
```
iS5comm(config)# router rip
```
- Enable RIP over the interface VLAN 1 (IP address 10.0.0.1/16).
```
iS5comm(config-router)# network 10.0.0.1
```
- Exit the Router Configuration Mode.
```
iS5comm(config-router)# exit
```
- Enter the Interface Configuration Mode.
```
iS5comm(config)# interface vlan 1
```
- Enable split horizon.
```
iS5comm(config-if)# ip split-horizon
```

View the Split Horizon enabled in ISS 1 using the following command.

Type the following:

iS5comm# show ip protocols

Routing Protocol is rip

RIP2 security level is Maximum

 Redistributing : rip

 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 Enabled

 Routing for Networks:

 10.0.0.0

 Routing Information Sources :

Interface Specific Address Summarisation:

 Interface vlan1

 Sending updates every 60 seconds

 Invalid after 120 seconds

 Flushed after 120 seconds

Send version is 1 2, receive version is 1

 Authentication type is sha-1

 Split Horizon is enabled

Restricts default route installation

Originate default route

Routing Protocol is "ospf" Router ID 0.0.0.0

 Number of areas in this router is 0 . 0 normal 0 stub 0 nssa

 Routing for Networks:

 Passive Interface(s):

 Routing Information Sources:

Gateway         Distance      Last Update(secs)

 Distance: (default is 121)

Routing Protocol is "bgp 0"

Outgoing update filter list for all interfaces is not set

Incoming update filter list for all interfaces is not set

IGP synchronization is disabled

Neighbor(s):

Address

Routing Information sources:

Gateway  Last Update

Disable split horizon.

iS5comm(config-if)# no ip split-horizon

Enable split horizon with poison reverse.

iS5comm(config-if)# ip split-horizon poison