Configure Telnet for a router or switch

Experiment Name: Configure telnet on a router or switch

Experimental purpose: to understand how to configure telneton a router or switch for remote login or telnet access to the switch

Experimental steps:

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2 Select a color-rendering router to start

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When not available, you can start the interface with cmd, which appears

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by the way in the Control Panel - program - turn programs on or off - tick the telnet client

3 in the Open admin interface, enter 172.28.15.102 2004 to enter the Ruijie interface

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At this point, you can enter show version to show whether you are in the router configuration interface or the switch interface

In turn, the router interface and the switch interface

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Here is the configuration (only for Configure telnet on the router as an example )

First Step: Configure the name of the router, the interface IP address, and the clock

R3740#configure Terminal

Enter configuration commands, one per Line. End with cntl/z. R3740 (config) #hostname RouterA

！ Configure the name of the router

RouterA (config) #interface Serial 4/0

！ Interface configuration mode into the serial port

RouterA (config-if) #clock Rate 512000

！ Set the clock frequency for the DCE end

RouterA (config-if) #ip Address 192.168.1.1 255.255.255.0

！ Configure interface IP address

RouterA (config-if) #no shutdown

！ Enable ports

RouterA (config-if) #exit

R3740#configure Terminal

Enter configuration commands, one per Line. End with cntl/z. R3740 (config) #hostname routerb

Routerb (config) #interface serial 4/0 routerb (config-if) #ip address 192.168.1.2 255.255.255.0 routerb (config-if) #no Shutdown

Routerb (config-if) #exit

Step two: Configure Telnet

RouterA (config) #enable Password Ruijie

！ Configure the Router's privileged mode password

RouterA (config) #line vty 0 4

！ Enter thread configuration mode

RouterA (config-line) #password star ! Configure Telnet password RouterA (config-line) #login

！ to authenticate when you set Telnet logon

RouterA (config-line) #end

Routerb (config) #enable Password Ruijie

Routerb (config) #line vty 0 4

Routerb (config-line) #password Star

Routerb (config-line) #login

Routerb (config-line) #end

Step three: test network connectivity and log in to the router in Telnet mode

Routerb#ping 192.168.1.1

Sending 5, 100-byte ICMP echoes to 192.168.1.1, timeout is 2 seconds: < press CTRL + C to break >

!!!!!

Success rate is percent (5/5), round-trip Min/avg/max = 1/2/10 ms

Routerb#telnet 192.168.1.1

Trying 192.168.1.1, 23 ...

User Access Verification

Password:

！ Prompt for Telnet password, Enter Ruijie here

routera>en

Password:

！ Prompt for Privileged mode password, enter star here

Routera#en

！ Telnet to Router Aforconfiguration

routera# routera#conf T

Enter configuration commands, one per Line. End with cntl/z. RouterA (config) #exit

routera#

routera# Routera#exit

！ Use the exit command to exit Telnet login routerb#

Routera#ping 192.168.1.2

Sending 5, 100-byte ICMP echoes to 192.168.1.2, timeout is 2 seconds: < press CTRL + C to break >

!!!!!

Success rate is percent (5/5), round-trip Min/avg/max = 1/4/10 ms

Routera#telnet 192.168.1.2

Trying 192.168.1.2, 23 ...

User Access Verification

Password:

routerb>en

Password:

routerb#

Routerb#conf T

Enter configuration commands, one per Line. End with Cntl/z.

Routerb (config) #exit

routerb#

Routerb#exit

routera#

"precautions"

1.If two routers are connected directly through the serial port, the clock frequency (DCE) must be set at one end.

2, if the Telnet password is not configured , the login will prompt "Password required, but none set".

3, if the enable password is not configured , then remote login to the router can not enter the privileged mode, prompting

"Password required, but none set".

Configure Telnet for a router or switch