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20
Unicast Routing
• Authentication Type – Specifies whether or not authentication is required for
exchanging protocol messages. (Default: No Authentication)
- No Authentication: No authentication is required.
- Simple Password: Requires the interface to exchange routing information with
other routers based on an authorized password. (Note that authentication only
applies to RIPv2.)
- MD5: Message Digest 5 (MD5) authentication.
MD5 is a one-way hash algorithm is that takes the authentication key and
produces a 128 bit message digest or "fingerprint." This makes it
computationally infeasible to produce two messages having the same message
digest, or to produce any message having a given pre-specified target message
digest.
• Authentication Key – Specifies the key to use for authenticating RIPv2 packets.
For authentication to function properly, both the sending and receiving interface
must use the same password. (Range: 1-16 characters, case sensitive)
Web - Click Routing Protocol, RIP, Interface Settings. Select the RIP protocol
message types that will be received and sent, the method used to provide faster
convergence and prevent loopback (i.e., prevent instability in the network topology),
and the authentication option and corresponding password. Then click Apply.
CLI - This example sets the receive version to accept both RIPv1 or RIPv2
messages, the send mode to RIPv1 compatible (i.e., called v2-broadcast in the CLI),
sets the method of preventing instability in the network topology to Split Horizon,
enables authentication via a simple password (i.e., called text mode in the CLI).
Console(config)#interface vlan 1
Console(config-if)#ip rip receive version 1 2
Console(config-if)#ip rip send version v2-broadcast
Console(config-if)#ip split-horizon
Console(config-if)#ip rip authentication mode text
Console(config-if)#ip rip authentication key mighty
Console#
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Figure 20-3 RIP Interface Settings
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