Resolving Junos/Junos EVO Radius Authentication Failure with “No Logical Login-ID Configured” Error

Junos and Junos EVO are two popular network operating systems developed by Juniper Networks. They are widely used in various networking devices, including routers, switches, and firewalls. One of the key features of these operating systems is their support for Remote Authentication Dial-In User Service (RADIUS) authentication. However, users may sometimes encounter a “No Logical Login-ID Configured” error when trying to authenticate using RADIUS. In this article, we will explore the causes of this error and provide step-by-step instructions on how to resolve it.

Understanding RADIUS Authentication

RADIUS is a protocol used for remote user authentication and accounting. It allows users to access a network by providing their credentials, such as a username and password, to a RADIUS server. The RADIUS server then authenticates the user and grants or denies access to the network based on the user’s credentials and the network’s access policies.

In Junos and Junos EVO, RADIUS authentication is configured using the “radius” command. This command allows administrators to specify the RADIUS server’s IP address, port number, and other parameters. When a user attempts to log in to the device, the device sends a RADIUS request to the RADIUS server, which then authenticates the user and returns a response to the device.

Causes of the “No Logical Login-ID Configured” Error

The “No Logical Login-ID Configured” error occurs when the Junos or Junos EVO device is unable to find a logical login ID for the user attempting to authenticate. This error can be caused by several factors, including:

• Incorrect RADIUS server configuration
• Missing or incorrect login ID configuration
• Authentication protocol mismatch
• RADIUS server connectivity issues

Troubleshooting the “No Logical Login-ID Configured” Error

To troubleshoot the “No Logical Login-ID Configured” error, administrators can follow these steps:

Step 1: Verify RADIUS Server Configuration

The first step is to verify that the RADIUS server is correctly configured. This includes checking the RADIUS server’s IP address, port number, and authentication protocol. Administrators can use the “show radius” command to display the current RADIUS configuration.

For example:

show radius

This command will display the current RADIUS configuration, including the RADIUS server’s IP address and port number.

Step 2: Verify Login ID Configuration

The next step is to verify that the login ID is correctly configured. Administrators can use the “show login” command to display the current login configuration.

For example:

show login

This command will display the current login configuration, including the login ID and authentication protocol.

Step 3: Verify Authentication Protocol

The authentication protocol used by the RADIUS server must match the authentication protocol configured on the Junos or Junos EVO device. Administrators can use the “show radius” command to display the current authentication protocol.

For example:

show radius

This command will display the current authentication protocol used by the RADIUS server.

Step 4: Verify RADIUS Server Connectivity

The final step is to verify that the Junos or Junos EVO device can connect to the RADIUS server. Administrators can use the “ping” command to test connectivity to the RADIUS server.

For example:

ping 10.1.1.1

This command will test connectivity to the RADIUS server with the IP address 10.1.1.1.

Resolving the “No Logical Login-ID Configured” Error

Once the cause of the “No Logical Login-ID Configured” error has been identified, administrators can take the necessary steps to resolve the issue. The following are some common solutions:

Solution 1: Configure the Login ID

If the login ID is not configured, administrators can use the “set login” command to configure the login ID.

For example:

set login id "username"

This command will configure the login ID to “username”.

Solution 2: Configure the RADIUS Server

If the RADIUS server is not correctly configured, administrators can use the “set radius” command to configure the RADIUS server.

For example:

set radius server 10.1.1.1 port 1812

This command will configure the RADIUS server with the IP address 10.1.1.1 and port number 1812.

Solution 3: Verify Authentication Protocol

If the authentication protocol is not correctly configured, administrators can use the “set radius” command to configure the authentication protocol.

For example:

set radius authentication-protocol pap

This command will configure the authentication protocol to PAP.

Conclusion

The “No Logical Login-ID Configured” error is a common issue that can occur when using RADIUS authentication with Junos and Junos EVO devices. By understanding the causes of this error and following the troubleshooting steps outlined in this article, administrators can quickly and easily resolve the issue. Additionally, by configuring the login ID, RADIUS server, and authentication protocol correctly, administrators can prevent this error from occurring in the future.

We hope this article has been informative and helpful in resolving the “No Logical Login-ID Configured” error. If you have any further questions or need additional assistance, please don’t hesitate to contact us.