Got it

Example for Configuring Telnet Login (Based on ACL Rules and RADIUS Authentication)

243 0 0 0 0


Telnet login to a switch facilitates remote management and maintenance on the switch so that you do not need to connect a terminal to each switch. By default, you cannot log in to a switch using Telnet. You need to log in to a switch through a console port and configure the Telnet function first. For details, see Example for Configuring Switch Login Through a Console Port.

An Access Control List (ACL) is a packet filter that filters packets based on rules. One or more rules describe the packet matching conditions, such as the source address, destination address, and port number of packets. For packets that match the ACL rules configured on a device, the device forwards or discards these packets according to the policies used by the service module to which the ACL is applied.

RADIUS uses the client/server model in distributed mode and protects a network against unauthorized access. It is often used on networks that require high security and remote user access control. After Telnet login based on RADIUS authentication is configured, a switch sends the user name and password of a login user to the RADIUS server. The RADIUS server then authenticates the user and records the user operations, ensuring network security.

If ACLs and RADIUS authentication are both configured, packets matching ACL rules reach an upper-layer module and then are authenticated in RADIUS mode based on the user name and password. The Telnet login mode based on ACL rules and RADIUS authentication therefore ensures network security.

Configuration Notes

  • Telnet is an insecure protocol. Using STelnet V2 is recommended.
  • Ensure that the user terminal has reachable routes to the switch and RADIUS server.
  • Ensure that the IP address, port number, and shared key of the RADIUS server are configured correctly on the switch and are the same as those on the RADIUS server.
  • Ensure that a user has been configured on the RADIUS server. In this example, the user (in the format of user name@domain name) and password Huawei@1234 have been configured.
  • This example applies to all versions of all S series switches.
imgDownload?uuid=9c0f8834f29e48918129ac1 NOTE:

The following uses the command lines and outputs of the S7700 running V200R006C00 as an example.

Networking Requirements

The network administrator requires remote management and maintenance on a switch and high network security for protecting the network against unauthorized access. To meet the requirements, configure Telnet login based on ACL rules and RADIUS authentication.

As shown in Figure 3-6, the Switch has reachable routes to the administrator and the RADIUS server. The IP address and port number of the RADIUS server are and 1812 respectively.

Figure 3-6  Networking diagram for configuring Telnet login based on ACL rules and RADIUS authentication 

Configuration Roadmap

The configuration roadmap is as follows:

  1. Configure the Telnet protocol so that users can log in to the Switch using Telnet.

  2. Configure an ACL rule to ensure that only users matching the ACL rule can log in to the Switch.

  3. Configure the RADIUS protocol to implement RADIUS authentication. After the configuration is complete, you can use the user name and password configured on the RADIUS server to log in to the Switch using Telnet, ensuring user login security.


  1. Configure Telnet login.

    <HUAWEI> system-view[HUAWEI] sysname Switch[Switch] telnet server enable[Switch] user-interface vty 0 14    //Enter the user interface views of VTY 0 to VTY 14.[Switch-ui-vty0-14] protocol inbound telnet    //Configure the VTY user interface to support Telnet. By default, switches in V200R006 and earlier versions support Telnet, and switches in V200R007 and later versions support SSH.[Switch-ui-vty0-14] authentication-mode aaa    //Set the authentication mode of users in VTY 0 to VTY 14 to AAA.[Switch-ui-vty0-14] user privilege level 15    //Set the level of users in VTY 0 to VTY 14 to 15.[Switch-ui-vty0-14] quit

  2. Configure a basic ACL rule.

    [Switch] acl 2008[Switch-acl-basic-2008] rule permit source 0[Switch-acl-basic-2008] quit[Switch] user-interface vty 0 14[Switch-ui-vty0-14] acl 2008 inbound    //Allow only users matching ACL 2008 in VTY 0 to VTY 14 to log in to the switch.[Switch-ui-vty0-14] quit

  3. Configure RADIUS authentication.

    # Configure a RADIUS server template on the Switch to implement communication with the RADIUS server.
    [Switch] radius-server template 1    //Enter the RADIUS server template view.[Switch-radius-1] radius-server authentication 1812    //Configure the RADIUS server.[Switch-radius-1] radius-server shared-key cipher Huawei@6789    //Set the shared key of the RADIUS server to Huawei@6789.[Switch-radius-1] quit
    imgDownload?uuid=9c0f8834f29e48918129ac1 NOTE:

    If the RADIUS server does not support a user name containing the domain name, run the undo radius-server user-name domain-included command to configure the Switch to send packets carrying a user name without the domain name to the RADIUS server.

    # Configure an AAA authentication scheme, with the authentication mode being RADIUS.
    [Switch] aaa[Switch-aaa] authentication-scheme sch1    //Create an authentication scheme named sch1.[Switch-aaa-authen-sch1] authentication-mode radius    //Set the authentication mode to RADIUS.[Switch-aaa-authen-sch1] quit
    # Create a domain, and apply the AAA authentication scheme and RADIUS server template in the domain.
    [Switch-aaa] domain    //Create a domain named and enter the domain view.[] authentication-scheme sch1    //Configure the authentication scheme sch1 for the domain.[] radius-server 1    //Apply the RADIUS server template 1 to the domain.[] quit[Switch-aaa] quit
    # Configure the domain as the default global management domain so that an administrator does not need to enter the domain name for logging in to the Switch.
    [Switch] domain admin

  4. Verify the configuration.

    Choose Start > Run as an administrator. Enter cmd to open the Windows Command Prompt window. Type telnet, and press Enter.

    C:\Documents and Settings\Administrator> telnet

    In the login interface, type the user name admin and password Huawei@1234 as prompted and press Enter. Authentication succeeds, and you successfully log in to the Switch using Telnet. (The following information is only for reference.)

    Login authentication
    Info: The max number of VTY users is 8, and the number
          of current VTY users on line is 2.
          The current login time is 2014-07-30 01:54+08:00. 

Configuration Files

Switch configuration file

sysname Switch
domain admin
telnet server enable
radius-server template 1
 radius-server shared-key cipher %^%#}+ysUO*B&+p'NRQR0{ZW7[GA*Z*!X@o:Va15dxQAj+,$>NP>63de|G~ws,9G%^%#
 radius-server authentication 1812 weight 80
acl number 2008
 rule 5 permit source 0
 authentication-scheme sch1    
  authentication-mode radius  
  authentication-scheme sch1     
  radius-server 1 
user-interface vty 0 14
 acl 2008 inbound
 authentication-mode aaa
 user privilege level 15 
 protocol inbound telnet 

See more please click

  • x
  • convention:


You need to log in to comment to the post Login | Register

Notice: To protect the legitimate rights and interests of you, the community, and third parties, do not release content that may bring legal risks to all parties, including but are not limited to the following:
  • Politically sensitive content
  • Content concerning pornography, gambling, and drug abuse
  • Content that may disclose or infringe upon others ' commercial secrets, intellectual properties, including trade marks, copyrights, and patents, and personal privacy
Do not share your account and password with others. All operations performed using your account will be regarded as your own actions and all consequences arising therefrom will be borne by you. For details, see " User Agreement."

My Followers

Login and enjoy all the member benefits


Are you sure to block this user?
Users on your blacklist cannot comment on your post,cannot mention you, cannot send you private messages.
Please bind your phone number to obtain invitation bonus.