Configuring Rip Authentication; Configuring Summary Addresses And Split Horizon - Cisco WS-C3750-48PS-S Software Configuration Manual

Chapter 34 Configuring IP Unicast Routing

Configuring 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 specifies \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. Therefore, you must also perform the tasks in the
page
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
configure terminal
Step 2 interface interface-id
Step 3 ip rip authentication key-chain name-of-chain
Step 4
ip rip authentication mode [text | md5}
Step 5
end
Step 6 show running-config interface [interface-id]
Step 7 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 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.
In general, disabling split horizon is not recommended unless you are certain that your application
Note
requires it to properly advertise routes.
If you want 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.
If split horizon is enabled, neither autosummary nor interface IP summary addresses are advertised.
Note
78-16180-02
34-73.
"Managing Authentication Keys" section on
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify the
interface to configure.
Enable RIP authentication.
Configure the interface to use plain text authentication (the
default) or MD5 digest authentication.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Catalyst 3750 Switch Software Configuration Guide
Configuring RIP
34-23