Day18.md

Day 18: Advanced Operations & Error Handling

Objective:

Explore more advanced NAPALM features and implement robust error handling.

Concepts:

• ping() and traceroute()
• get_users()
• Error handling with try...except...finally blocks.

Challenge:

1. Ping a non-existent IP address and handle the expected failure gracefully.
2. Attempt to trace a route to 8.8.8.8.
3. Retrieve the configured users on arista1.

Code Examples:

1. day6_advanced_ops.py:

from napalm import get_network_driver
import json

DEVICE_IP = "YOUR_ARISTA1_IP"
USERNAME = "admin"
PASSWORD = "admin"

driver = get_network_driver("eos")
device = driver(
    hostname=DEVICE_IP,
    username=USERNAME,
    password=PASSWORD,
    optional_args={"secret": PASSWORD}
)

try:
    device.open()

    print("\n--- Testing Ping (successful) ---")
    ping_result = device.ping("8.8.8.8") # Or an IP reachable from your cEOS
    print(json.dumps(ping_result, indent=2))

    print("\n--- Testing Ping (unsuccessful/non-existent IP) ---")
    try:
        ping_fail_result = device.ping("1.1.1.1") # Assuming this is not reachable
        print(json.dumps(ping_fail_result, indent=2))
    except Exception as e:
        print(f"Expected error during ping to non-existent IP: {e}")

    print("\n--- Testing Traceroute ---")
    try:
        traceroute_result = device.traceroute("8.8.8.8")
        print(json.dumps(traceroute_result, indent=2))
    except Exception as e:
        print(f"Error during traceroute: {e}")

    print("\n--- Getting Users ---")
    users = device.get_users()
    print(json.dumps(users, indent=2))

except Exception as e:
    print(f"An unexpected error occurred during operation: {e}")
finally:
    if device.is_alive():
        device.close()