Configuring Eigrp Route Authentication - Cisco Catalyst 3550 series Software Configuration Manual

Configuring EIGRP
Command
Step 6 ip hold-time eigrp autonomous-system-number
seconds
Step 7
no ip split-horizon eigrp autonomous-system-number (Optional) Disable split horizon to allow route information
Step 8
end
Step 9
show ip eigrp interface
Step 10 copy running-config startup-config
Use the no forms of these commands to disable the feature or return the setting to the default value.

Configuring EIGRP Route Authentication

EIGRP route authentication provides MD5 authentication of routing updates from the EIGRP routing
protocol to prevent the introduction of unauthorized or false routing messages from unapproved sources.
Beginning in privileged EXEC mode, follow these steps to enable authentication:
Command
Step 1 configure terminal
Step 2
interface interface-id
Step 3
ip authentication mode eigrp autonomous-system md5
Step 4 ip authentication key-chain eigrp autonomous-system
key-chain
Step 5 exit
Step 6
key chain name-of-chain
Step 7
key number
Step 8
key-string text
Catalyst 3550 Multilayer Switch Software Configuration Guide
31-42
Chapter 31
Purpose
(Optional) Change the hold time interval for an EIGRP
routing process. The range is 1 to 65535 seconds. The
default is 180 seconds for low-speed NBMA networks and
15 seconds for all other networks.
Do not adjust the hold time without consulting
Caution
Cisco technical support.
to be advertised by a router out any interface from which that
information originated.
Return to privileged EXEC mode.
Display which interfaces EIGRP is active on and
information about EIGRP relating to those interfaces.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify the
Layer 3 interface to configure.
Enable MD5 authentication in IP EIGRP packets.
Enable authentication of IP EIGRP packets.
Return to global configuration mode.
Identify a key chain and enter key-chain configuration
mode. Match the name configured in Step 4.
In key-chain configuration mode, identify the key
number.
In key-chain key configuration mode, identify the key
string.
Configuring IP Unicast Routing
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