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Chapter 27
Configuring Switch Access Using AAA
Defining a Private DES Key
You can define a private DES key for the switch. The private DES key can be used to encrypt the secret
key that the switch shares with the KDC so that when the show kerberos command is executed, the
secret key is not displayed in clear text. The key length should be eight characters or less.
To define a DES key, perform this task in privileged mode:
Task
Define a DES key for the switch.
This example shows how to define a DES key and verify the configuration:
Console> (enable) set key config-key abcd
Kerberos config key set to abcd
Console> (enable) show kerberos
Kerberos Local Realm:CISCO.COM
Kerberos server entries:
Realm:CISCO.COM,
Realm:CISCO.COM,
Kerberos Domain<->Realm entries:
Domain:cisco.com,
Kerberos Clients Mandatory
Kerberos Credentials Forwarding Disabled
Kerberos Pre Authentication Method set to Encrypted Unix Time Stamp
Kerberos config key:abcd
Kerberos SRVTAB Entries
Srvtab Entry 1:host/aspen-niners.cisco.edu@CISCO.EDU 0 933974942 1 1 8 12151><88?=>>3>11
Console> (enable)
To clear the DES key, perform this task in privileged mode:
Task
Clear a DES key from the switch.
This example shows how to clear the DES key:
Console> (enable) clear key config-key
Kerberos config key cleared
Console> (enable)
Encrypting a Telnet Session
After a user authenticates to the switch using Kerberos and wants to Telnet to another switch or host,
whether this will be a Kerberized Telnet session depends on the authentication method that the Telnet
server uses. If the Telnet server uses Kerberos for authentication, you can have all the application data
packets encrypted during the duration of the Telnet session. To encrypt the Telnet session, use the
encrypt kerberos option in the telnet command.
78-12647-02
Server:170.20.2.1,
Server:172.20.2.1,
Realm:CISCO.COM
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
Command
set key config-key string
Port:750
Port:750
Command
clear key config-key string
Configuring Authentication
27-37
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