для Cisco Cisco IOS Software Release 12.0(18)S

Protocols which require the retrieval of clear text passwords, such as CHAP, cannot be used with 
MD5 encrypted passwords.

You can specify a username password, or a username secret, but not both.

To establish a username-based authentication system, use the username command in global 
configuration mode. See Passwords and Privileges Commands for more details.

Cisco 7200 routers

Cisco 7500 series

Cisco IOS software is packaged in feature sets that support specific platforms. To get updated 
information regarding platform support for this feature, access Feature Navigator. Feature Navigator 
dynamically updates the list of supported platforms as new platform support is added for the feature.

Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS software 
images support a specific set of features and which features are supported in a specific Cisco IOS image.

To access Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your 
account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify 
that your e-mail address is registered with Cisco.com. If the check is successful, account details with a 
new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com 
by following the directions at http://www.cisco.com/register.

Feature Navigator is updated when major Cisco IOS software releases and technology releases occur. As 
of May 2001, Feature Navigator supports M, T, E, S, and ST releases. You can access Feature Navigator 
at the following URL:

http://www.cisco.com/go/fn

No new or modified standards are supported by this feature.