If you
con?¬?gure the service password-encryption command, the key string is stored and displayed in
an encrypted form; when it is displayed, an encryption type of 7 is speci?¬?ed before the encrypted
key string.
188 Chapter 5: Implementing EIGRP
Con?¬?guring MD5 Authentication for EIGRP
To con?¬?gure MD5 authentication for EIGRP, complete the following steps:
Step 1 Enter con?¬?guration mode for the interface on which you want to enable
authentication.
Step 2 Use the ip authentication mode eigrp autonomous-system md5 command
to specify that MD5 authentication is to be used for EIGRP packets. The
value provided for the autonomous-system parameter of the ip
authentication mode eigrp md5 command indicates the EIGRP AS
number in which authentication is to be used.
Step 3 Use the ip authentication key-chain eigrp autonomous-system name-ofchain
command to specify which key chain to use for the authentication of
EIGRP packets. Table 5-9 describes the parameters for this command.
Example: MD5 Authentication Con?¬?guration
Figure 5-7 shows an example network used for the con?¬?guration of EIGRP MD5 authentication
for Router X in Example 5-6.
Figure 5-7 Network Topology for EIGRP MD5 Con?¬?guration Example
Table 5-9 ip authentication key-chain eigrp Parameters
Parameter Description
autonomous-system The EIGRP AS number in which authentication is to be used
name-of-chain The name of the authentication key chain from which a key is to be obtained
Example 5-6 Con?¬?guring EIGRP MD5 Authentication on Router X
RouterX