Chapter 8
| Authentication Commands
Secure Shell
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To use the SSH server, complete these steps:
1. Generate a Host Key Pair – Use the ip ssh crypto host-key generate command to
create a host public/private key pair.
2. Provide Host Public Key to Clients – Many SSH client programs automatically
import the host public key during the initial connection setup with the switch.
Otherwise, you need to manually create a known hosts file on the management
station and place the host public key in it. An entry for a public key in the
known hosts file would appear similar to the following example:
10.1.0.54 1024 35 15684995401867669259333946775054617325313674890836547254
15020245593199868544358361651999923329781766065830956
108259132128902337654680172627257141342876294130119619556678259566410486957427
888146206519417467729848654686157177393901647793559423035774130980227370877945
4524083971752646358058176716709574804776117
3. Import Client’s Public Key to the Switch – Use the copy tftp public-key
command to copy a file containing the public key for all the SSH client’s
granted management access to the switch. (Note that these clients must be
configured locally on the switch with the username command.) The clients are
subsequently authenticated using these keys. The current firmware only
accepts public key files based on standard UNIX format as shown in the
following example for an RSA key:
1024 35
134108168560989392104094492015542534763164192187295892114317388005553616163105
177594083868631109291232226828519254374603100937187721199696317813662774141689
851320491172048303392543241016379975923714490119380060902539484084827178194372
288402533115952134861022902978982721353267131629432532818915045306393916643
steve@192.168.1.19
4. Set the Optional Parameters – Set other optional parameters, including the
authentication timeout, the number of retries, and the server key size.
5. Enable SSH Service – Use the ip ssh server command to enable the SSH server
on the switch.
6. Authentication – One of the following authentication methods is employed:
Password Authentication (for SSH v1.5 or V2 Clients)
a. The client sends its password to the server.
b. The switch compares the client's password to those stored in memory.
c. If a match is found, the connection is allowed.
Note:
To use SSH with only password authentication, the host public key must still
be given to the client, either during initial connection or manually entered into the
known host file. However, you do not need to configure the client's keys.
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