The password can be any continuous string of
characters that can be entered from the keyboard, up to eight characters in
length.
The password that is created by this command is used as a ???key??? that is
inserted directly into the OSPF header when Cisco IOS Software originates
routing protocol packets. A separate password can be assigned to each
network on a per-interface basis. All neighboring routers on the same
network must have the same password to be able to exchange OSPF
information.
Step 2 Specify the authentication type using the interface level ip ospf
authentication command. Table 4-6 explains the parameters for this
command.
For plaintext password authentication, use the ip ospf authentication
command with no parameters. Before using this command, con?¬?gure a
password for the interface using the ip ospf authentication-key command.
NOTE In Cisco IOS Release 12.4, the router gives a warning message if you try to con?¬?gure
a password longer than eight characters; only the ?¬?rst eight characters are used. Some earlier
Cisco IOS Software releases did not provide this warning.
NOTE If you do not use the service password-encryption command when con?¬?guring
OSPF authentication, the key is stored as plaintext in the router con?¬?guration.
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