The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
This chapter contains the following sections:
The Telnet protocol enables you to set up 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 pass the keystrokes from one device to the other. Telnet can accept either an IPv4 address or a domain name as the remote device address.
You have configured IP on a Layer 3 interface, out of band on the mgmt 0 interface.
Parameter |
Default |
---|---|
Telnet server |
Disabled |
Configuring Telnet
The Telnet server is enabled by default, but you can reenable the server if necessary.
Log in to the CLI in EXEC mode.
1. switch# configure terminal
2. switch(config)# feature telnet
3. (Optional) switch(config)# show telnet server
4. (Optional) switch(config)# copy running-config startup-config
The following example enables the Telnet server:
switch# configure terminal switch(config)# feature telnet switch(config)# show telnet server telnet service enabled switch(config)# copy running-config startup-config
1. switch# telnet {ip address | host-name} [port-number] [vrf vrf-name]
Command or Action | Purpose |
---|
Log in to the CLI in EXEC mode.
1. switch# show users
2. switch# clear line vty-line
3. (Optional) switch# show users
Command or Action | Purpose |
---|
The following example clears a Telnet session:
switch# show users NAME LINE TIME IDLE PID COMMENT admin tty1 Jul 25 19:13 old 2867 admin pts/1 Jul 28 14:04 . 31453 (::ffff:171.70.209.8) admin pts/2 Jul 28 14:04 . 31475 (171.70.209.8)* switch# clear line 1 switch# show users NAME LINE TIME IDLE PID COMMENT admin tty1 Jul 25 19:13 old 2867 admin pts/2 Jul 28 14:04 . 31475 (171.70.209.8)* switch#
Use one of the following commands to verify the configuration:
Command |
Purpose |
---|---|
show running-config security [all] |
Displays the SSH and user account configuration in the running configuration. The all keyword displays the default values for the SSH and user accounts. |
show telnet server |
Displays the Telnet server configuration. |
show hosts |
Displays the configuration details for current hosts. |
The following example displays the user account configuration in the running configuration for :
switch(config)# show running-config security all !Command: show running-config security all !Time: Tue Sep 17 22:04:20 2013 version 5.2(1)SK1(2.1) feature telnet feature http-server no feature scp-server no feature sftp-server feature ssh username adminbackup password 5 ! role network-operator username admin password 5 $1$qnBf/DZs$SADurdd7yy/VMA19E./N11 role network-admin username admin keypair rsa username ajidas password 5 $1$L8yMjMMy$xIGNCA.CkgnVY70nBqnhr1 expire 2020-12-30 role network-operator password strength-check banner motd #Nexus 1000v Switch # ssh key rsa 2048 no ssh key dsa
The following example displays the Telnet server configuration:
switch(config)# show telnet server telnet service enabled
The following example displays the configuration details for current hosts:
switch(config)# show hosts DNS lookup enabled Name/address lookup uses domain service Name servers are 255.255.255.255 Host Address host1 192.0.2.0 host2 198.51.100.0 host3 203.0.113.0
Feature Name |
Feature Information |
|
---|---|---|
Telnet |
Release 5.2(1)SK1(2.1) |
This feature was introduced. |