Configuring Split Horizon; Configuring Summary Addresses - Cisco ME 3400 Software Configuration Manual

Chapter 35 Configuring IP Unicast Routing
Command
Step 6
end
Step 7
show running-config interface [interface-id]
Step 8 copy running-config startup-config
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.
In general, Cisco does not recommend disabling split horizon unless you are certain that your application
Note
requires it to properly advertise routes.
Beginning in privileged EXEC mode, follow these steps to disable split horizon on the interface:
Command
Step 1 configure terminal
Step 2 interface interface-id
Step 3 no shutdown
Step 4 ip address ip-address subnet-mask
Step 5
no ip split-horizon
Step 6 end
Step 7 show ip interface interface-id
Step 8 copy running-config startup-config
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.
OL-9639-07
Purpose
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify the interface to
configure.
Enable the interface if necessary. By default, UNIs and ENIs are
disabled and NNIs are enabled.
Configure the IP address and IP subnet.
Disable split horizon on the interface.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
Configuring RIP
35-21