Operational monitoring and maintenance of JUNOS devices

1. Methods of Monitoring and maintenance of JUNOS devices

1.1 show commands

4. show interfaces statistics: Displays statistical information about the interfaces, including the number of packets transmitted and received, error counts, and bandwidth utilization.

5. show log: Displays the system log, including system events and messages.

6. show configuration: Displays the current configuration of the device.

user@host> show configuration 
interfaces {
    ge-0/0/0 {
        unit 0 {
            family inet {
                address 10.0.0.1/24;
            }
        }
    }
    ge-0/0/1 {
        unit 0 {
            family inet {
                address 10.0.1.1/24;
            }
        }
    }
}
routing-options {
    static {
        route 10.1.1.0/24 next-hop 10.0.0.2;
    }
}

7. show chassis hardware: Displays information about the hardware components of the device, such as the model number, serial number, and firmware version.

These are just a few examples of the many "show" commands available in Junos OS. Each command provides detailed information about a specific aspect of the device and its configuration, allowing administrators to quickly diagnose and resolve issues.

1.2 Monitor commands

The purpose of monitor commands in Junos OS is to provide real-time information about the state and performance of a device and its components. These commands allow administrators to proactively monitor and troubleshoot issues, ensuring that the device and network are operating optimally. Some of the most frequently used monitor commands are given below:

1. monitor interfaces: shows real-time information about physical interfaces, such as error statistics, traffic statistics, and operational status.
2. monitor traffic: displays real-time network traffic statistics and information, such as the number of packets, bytes, and errors.
3. monitor route: displays real-time information about the routing table, such as the number of routes and their status.
4. monitor start: starts the process of monitoring a particular aspect of the device, such as the routing table, interfaces, or traffic.
5. monitor clear: stops the process of monitoring and clears the previous monitor data.
6. monitor file: writes the monitor data to a file instead of displaying it on the screen.
7. monitor request system statistics: displays real-time system statistics, such as memory utilization, CPU utilization, and process statistics.
8. monitor request pfe execute command: allows the administrator to execute a command on the Packet Forwarding Engine and display the results in real-time.
9. monitor request chassis routing-engine: displays real-time information about the routing engine, such as its status, utilization, and memory utilization.
10. monitor request chassis alarm show: displays real-time information about the device's alarms and their current status, such as active alarms, inactive alarms, and cleared alarms.

These commands allow administrators to monitor the device and network in real-time, identify potential issues, and take proactive measures to resolve them before they become critical. The monitor commands can also be used to diagnose issues that have already occurred and provide valuable information for root cause analysis.