Telnet Server
The Telnet protocol enables TCP/IP connections to a host. Telnet allows a user at one site to establish a TCP
connection to a login server at another site, and then passes the keystrokes from one system to the other. Telnet
can accept either an IP address or a domain name as the remote system address.
The Telnet server is enabled by default on the Cisco Nexus device.
Guidelines and Limitations for SSH
SSH has the following configuration guidelines and limitations:
•
The Cisco Nexus device supports only SSH version 2 (SSHv2).
Configuring SSH
Generating SSH Server Keys
You can generate an SSH server key based on your security requirements. The default SSH server key is an
RSA key that is generated using 1024 bits.
Procedure
PurposeCommand or Action
Enters global configuration move.switch# configure terminal
Step 1
Generates the SSH server key.switch(config)# ssh key {dsa
[force] | rsa [bits [force]]}
Step 2
The bits argument is the number of bits used to generate the
key. The range is from 768 to 2048 and the default value is
1024.
Use the force keyword to replace an existing key.
Exits global configuration mode.switch(config)# exit
Step 3
(Optional)
Displays the SSH server keys.
switch# show ssh key [dsa | rsa]
[md5]
Step 4
For Cisco NX-OS Release 7.0(3)I4(6) and any later 7.0(3)I4(x)
release, this command displays the fingerprint in SHA256
format by default. SHA256 is more secure than the old default
format of MD5. However, the md5 option has been added, if
you want to see the fingerprint in MD5 format for backward
compatibility.
Cisco Nexus 3600 NX-OS Security Configuration Guide, Release 7.x
61
Configuring SSH and Telnet
Telnet Server
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