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no ip telnet server
Function: Enable the Telnet server function in the switch: the “no telnet-server enable”
command disables the Telnet function in the switch.
Default: Telnet server function is enabled by default.
Command mode: Global Mode
Usage Guide: This command is available in Console only. The administrator can use this
command to enable or disable the Telnet client to login to the switch.
Example: Disable the Telnet server function in the switch.
Switch(Config)#no telnet-server enable
2.2.2.3.4 telnet-server securityip
Command: telnet-server securityip <ip-addr>
no telnet-server securityip <ip-addr>
Function: Configure the secure IP address of Telnet client allowed to login to the switch;
the “no telnet-server securityip <ip-addr>” command deletes the authorized Telnet
secure address.
Parameter: <ip-addr> is the secure IP address allowed to access the switch, in dot
decimal format.
Default: no secure IP address is set by default.
Command mode: Global Mode
Usage Guide: When no secure IP is configured, the IP addresses of Telnet clients
connecting to the switch will not be limited; if a secure IP address is configured, only hosts
with the secure IP address is allowed to connect to the switch through Telnet for
configuration. The switch allows multiple secure IP addresses.
Example: Set 192.168.1.21 as a secure IP address.
Switch(Config)#telnet-server securityip 192.168.1.21
2.2.3 SSH
2.2.3.1 Introduction to SSH
SSH (Secure Shell) is a protocol which ensures a secure remote access connection
to network devices. It is based on the reliable TCP/IP protocol. By conducting the
mechanism such as key distribution, authentication and encryption between SSH server
and SSH client, a secure connection is established. The information transferred on this