Netmiko / textfsm

Question

‘你好，我按我想要的方式解析了我的信息。但现在我正在尝试将输出保存到可能的.txt文件中。我不确定在"backup.write()“中键入什么。如果我键入" output”变量，它将保存整个输出，而不是解析的部分。’

    connection = ConnectHandler(**cisco_device)
    # print('Entering the enable mode...')
    # connection.enable()
    prompt = connection.find_prompt()
    hostname = prompt[0:-1]
    print(hostname)
    
    output = connection.send_command('show interfaces status', use_textfsm=True)
    
    for interface in output:
        if interface['status'] == 'notconnect':
            print(f"interface {interface['port']} \n shutdown")
    
    print(hostname)
    print('*' * 85)
    
    # minute = now.minute
    now = datetime.now()
    year = now.year
    month = now.month
    day = now.day
    hour = now.hour
    
    # creating the backup filename (hostname_date_backup.txt)
    filename = f'{hostname}_{month}-{day}-{year}_backup.txt'
    
    # writing the backup to the file
    with open(filename, 'w') as backup:
    backup.write()
    print(f'Backup of {hostname} completed successfully')
    print('#' * 30)
    
    print('Closing connection')
    connection.disconnect()

Answer 1

显示我想要的结果是运行Cisco IOS命令“

interface status”，并使用textfsm模块解析数据，以便仅提供数据中的接口。我在show ip interface brief上也做了同样的尝试，因为我现在无法访问思科交换机。对于show interfaces status，两种方法都适用，但具有不同的输出修饰符或if条件。

因此，要获得以下输出，您可以使用两种方法：

CLI1-输出修改器

show ip interface brief | include down

剩下的部分留给TextFSM来解析输出

[{'intf': 'GigabitEthernet2',
  'ipaddr': 'unassigned',
  'proto': 'down',
  'status': 'administratively down'},
 {'intf': 'GigabitEthernet3',
  'ipaddr': '100.1.1.1',
  'proto': 'down',
  'status': 'down'}]

Python 2-

您可以从show ip interface brief获得整个输出，并在所有解析的接口上循环，并设置if条件以仅获取关闭的接口。(推荐)

# Condition for `show ip interface brief`
down = [
    intf
    for intf in intfs
    if intf["proto"] == "down" or intf["status"] in ("down", "administratively down")
]

# Condition for `show interfaces status`
down = [
    intf
    for intf in intfs
    if intf["status"] == "notconnect"
]

将List[Dict]导出为.txt文件毫无意义。在.txt文件中没有任何语法突出显示或格式设置。最好将其导出为JSON文件。所以你想要实现的一个完整的例子可以是这样的：

import json
from datetime import date

from netmiko import ConnectHandler

device = {
    "device_type": "cisco_ios",
    "ip": "x.x.x.x",
    "username": "xxxx",
    "password": "xxxx",
    "secret": "xxxx",
}

with ConnectHandler(**device) as conn:
    print(f'Connected to {device["ip"]}')
    if not conn.check_enable_mode():
        conn.enable()
    hostname = conn.find_prompt()[:-1]
    intfs = conn.send_command(
        command_string="show ip interface brief", use_textfsm=True
    )
print("Connection Terminated")

down = [
    intf
    for intf in intfs
    if intf["proto"] == "down" or intf["status"] in ("down", "administratively down")
]

with open(file=f"{hostname}_down-intfs_{date.today()}.json", mode="w") as f:
    json.dump(obj=down, fp=f, indent=4)
print(f"Completed backup of {hostname} successfully")

# In case you have to export to text file
# with open(file=f"{hostname}_down-intfs_{date.today()}.txt", mode="w") as f:
#     f.write(down)
# print(f"Completed backup of {hostname} successfully")