821
Configuring IP Unicast Routing
Configuring RIP
DETAILED STEPS
To restore clear text authentication, use the no ip rip authentication mode interface configuration command. To prevent
authentication, use the no ip rip authentication key-chain interface configuration command.
EXAMPLE
The following example configures the interface to accept and send any key belonging to the key chain named trees and
configures the interface to use MD5 authentication:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface ethernet 0
Switch(config-if)# ip rip authentication key-chain trees
Switch(config-if)# ip rip authentication mode md5
Switch(config-if)# end
Configuring Split Horizon
Routers connected to broadcast-type IP networks and using distance-vector routing protocols normally use the
split-horizon mechanism to reduce the possibility of routing loops. Split horizon blocks information about routes from
being advertised by a router on any interface from which that information originated. This feature can optimize
communication among multiple routers when links are broken.
BEFORE YOU BEGIN
In general, Cisco does not recommend disabling split horizon unless you are certain that your application requires
disabling it to properly advertise routes.
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 rip authentication key-chain
name-of-chain
Enable RIP authentication.
5. ip rip authentication mode [text | md5} Configure the interface to use plain text
authentication (the default) or MD5 digest
authentication.
6. end Return to privileged EXEC mode.
7. show running-config interface [interface-id] Verify your entries.
8. copy running-config startup-config (Optional) Save your entries in the configuration file.
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