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Configuring EIGRP
EIGRP Configuration Examples
IPC-275
Cisco IOS IP Configuration Guide
Route Authentication Example
The following example enables MD5 authentication on EIGRP packets in autonomous system 1.
Figure 52 shows the scenario.
Figure 52 EIGRP Route Authentication Scenario
Router A Configuration
interface ethernet 1
ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 holly
key chain holly
key 1
key-string 0987654321
accept-lifetime 04:00:00 Dec 4 1996 infinite
send-lifetime 04:00:00 Dec 4 1996 04:48:00 Dec 4 1996
exit
key 2
key-string 1234567890
accept-lifetime 04:00:00 Dec 4 1996 infinite
send-lifetime 04:45:00 Dec 4 1996 infinite
Router B Configuration
interface ethernet 1
ip authentication mode eigrp 1 md5
ip authentication key-chain eigrp 1 mikel
key chain mikel
key 1
key-string 0987654321
accept-lifetime 04:00:00 Dec 4 1996 infinite
send-lifetime 04:00:00 Dec 4 1996 infinite
exit
key 2
key-string 1234567890
accept-lifetime 04:00:00 Dec 4 1996 infinite
send-lifetime 04:45:00 Dec 4 1996 infinite
Router A will accept and attempt to verify the MD5 digest of any EIGRP packet with a key equal to 1.
It will also accept a packet with a key equal to 2. All other MD5 packets will be dropped. Router A will
send all EIGRP packets with key 2.
Router B will accept key 1 or key 2, and will send key 1. In this scenario, MD5 will authenticate.
E1
E1
S5836
Enhanced IGRP Autonomous System 1
Router A
Router B