AIS AI2524 Router Card User’s Manual Enable RIP Authentication, Disable Route Summarization

AI2524 Router Card User’s Manual

Enable RIP Authentication

RIP Version 1 does not support authentication. If you are sending and receiving RIP Versio n2 packets, you can enable RIP authentication on an interface.

The key chain determines the set of keys that can be used on the inter- face. If a key chain is not configured, no authentication is performed on that interface, not even the default authentication. Therefore, you must also perform the tasks in the section Manage Authentication Keys later in this chapter.

The software supports two modes of authentication on an interface for which RIP authentication is enabled: plain text authentication and MD5 authentication. The default authentication in every RIP Version 2 packet is plain text authentication.

Note:	For security purposes, do not use plain text authentication
	in RIP packets, because the unencrypted authentication
	key is sent in every RIP Versio n2 packet. Use plain text
	authentication when security is not an issue, for example,
	to ensure that misconfigured hosts do not participate in
	routing.

To configure RIP authentication, perform these tasks in interface con- figuration mode:

1. Enable RIP authentication.

ip rip authentication key-chain name-of-

chain

2.Configure the interface to use MD5 digest authentication (or let it default to plain text authentication).

ip rip authentication mode {text md5}

Disable Route Summarization

RIP Version 2 supports automatic route summarization by default. The software summarizes subprefixes to the classful network bound- ary when crossing classful network boundaries.

If you have disconnected subnets, disable automatic route summariza- tion to advertise the subnets. When route summarization is disabled, the software transmits subnet and host routing information across classful network boundaries. To disable automatic summarization, type this command in router configuration mode:

no auto-summary

Page 8-18	August 1997
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