Configuring the Syslog Service on Juniper devices

1. Login to the Juniper device as an administrator. 
2. Navigate to the Configure tab. 
3. Expand CLI Tools on the left pane, click on CLI editor in the subtree, and navigate to syslog under system.
4. For standard logs, insert the host node with the required values such as the host name, severity, facility and log prefix. Consider the following command:

   host ela-server{
   any any;
   port 513;
   }

   This will forward the log data in standard format. You can customize the syslog severity level by editing the command.

5. For structured logs, mention 'structured-data' in the command line. Consider the following command.

   host ela-server{
   any any;
   port 513;
   structured-data;
   }

   This will forward the log data in a structured format.

6. Click on Commit to save the changes. To view the changes, click on the CLI viewer. 

Note: It is recommended to use structured logs