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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
Chapter 35 Configuring IP Unicast Routing
Configuring RIP
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.
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.
Note In general, Cisco does not recommend disabling split horizon unless you are certain that your application
requires it to properly advertise routes.
Beginning in privileged EXEC mode, follow these steps to disable split horizon on the interface:
To enable the split horizon mechanism, use the ip split-horizon interface configuration command.
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.
Step 6
end Return to privileged EXEC mode.
Step 7
show running-config interface [interface-id] Verify your entries.
Step 8
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter interface configuration mode, and specify the interface to
configure.
Step 3
no shutdown Enable the interface if necessary. By default, UNIs and ENIs are
disabled and NNIs are enabled.
Step 4
ip address ip-address subnet-mask Configure the IP address and IP subnet.
Step 5
no ip split-horizon Disable split horizon on the interface.
Step 6
end Return to privileged EXEC mode.
Step 7
show ip interface interface-id Verify your entries.
Step 8
copy running-config startup-config (Optional) Save your entries in the configuration file.
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