Rip Authentication; Summary Addresses And Split Horizon - Cisco ONS 15454 Software Feature And Configuration Manual

Configuring IP Routing
Router# show ip rip database
192.168.1.0/24
192.168.1.0/24
192.168.2.0/24
192.168.2.0/24
192.168.3.0/24
192.168.3.0/24

RIP Authentication

RIP Version 1 does not support authentication. If you are sending and receiving RIP Version 2 packets,
you can enable RIP authentication on an interface. The key chain determines the set of keys that can be
used on the interface. If a key chain is not configured, no authentication is performed, not even the
default.
The switch supports two modes of authentication on interfaces for which RIP authentication is enabled:
plain text and MD5. The default is plain text.
Beginning in privileged EXEC mode, follow these steps to configure RIP authentication on an interface:
Command
Step 1
Router# configure terminal
Step 2
Router(config)# interface interface-id
Step 3
Router(config-if)# ip rip
authentication key-chain name-of-chain
Step 4
Router(config-if)# ip rip
authentication mode {text | md5}
Step 5
Router(config-if)# end
Step 6
Router# show running-config interface
[ interface-id ]
Step 7
Router# 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.

Summary Addresses and 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 usually optimizes communication among multiple routers, especially when links
are broken.
Cisco ONS 15454 SONET/SDH ML-Series Multilayer Ethernet Card Software Feature and Configuration Guide, R4.0
10-8
auto-summary
[1] via 192.168.2.1, 00:00:24, POS0
auto-summary
directly connected, POS0
auto-summary
directly connected, FastEthernet0
Chapter 10
Purpose
Enters global configuration mode.
Enters interface configuration mode, and specifies the
interface to configure.
Enables RIP authentication.
Configures the interface to use plain text
authentication (the default) or MD5 digest
authentication.
Returns to privileged EXEC mode.
Verifies your entries.
(Optional) Saves your entries in the configuration file.
Configuring Networking Protocols
78-15224-02