Python Q&A for Network Engineers

Overview

Q & A

I am often asked questions about how to solve this or that problem, and I decided to post these questions and solutions here, in case it is also useful to someone.

The description of the question can be used as a task and you can first solve it yourself, and then see the solution.

QA Description Topics/modules used in solutions
1 Split the interface configuration into two parts regex, format, jinja2
2 Network Topology Discovery Using CDP/LLDP scrapli, regex, queue, click, rich
3 Filter JSON data by key recursion, generator, regex, click
4 Collect Port Status Information scrapli, concurrent.futures, regex, rich

Q&A 1 Split the interface configuration into two parts

English translation

Надо разбить настройку интерфейса на две части. Есть конфигурация интерфейса такого вида:

set interfaces ae0 unit 1001 description "EXAMPLE_1001"
set interfaces ae0 unit 1001 vlan-tags outer 18
set interfaces ae0 unit 1001 vlan-tags inner 10
set interfaces ae0 unit 1001 family inet policer input P-IN-L2
set interfaces ae0 unit 1001 family inet policer output P-OUT-L2
set interfaces ae0 unit 1001 family inet address 60.1.1.1/30

Эту конфигурацию надо разбить на две части:

set interfaces ae9 unit 1001 description "EXAMPLE_1001"
set interfaces ae9 unit 1001 encapsulation vlan-bridge
set interfaces ae9 unit 1001 vlan-tags outer 18
set interfaces ae9 unit 1001 vlan-tags inner 10
set interfaces ae9 unit 1001 family bridge policer input P-IN-L2
set interfaces ae9 unit 1001 family bridge policer output P-OUT-L2

и

set interfaces irb unit 1001 description "EXAMPLE_1001"
set interfaces irb unit 1001 family inet address 60.1.1.1/30
set interfaces irb unit 1001 mac 00:ff:3c:01:01:01

Подробнее

Q&A 2 Network Topology Discovery Using CDP/LLDP

English translation

Надо обнаружить топологию сети через вывод CDP (считаем что CDP есть на всех устройствах). Для старта должен быть известен IP-адрес одного устройства и параметры подключения по SSH ко всем устройствам в сети.

Надо подключиться к первому устройству, дать команду sh cdp neighbors detail, получить всех соседей и их IP-адреса и подключаться к каждому соседу. На каждом соседе опять дать команду sh cdp neighbors detail и получить соседей этого устройства. Так надо пройтись по всей сети и собрать информацию об устройствах и топологии.

Подробнее

Q&A 3 Filter JSON data by key

English translation

Задача отфильтровать данные из JSON файла по указанному ключу. Технически речь об отборе данных из словаря/списка, так как после чтения данных в Python это уже будет Python list/dict. JSON упоминается потому что именно в этом формате часто очень большая вложенность.

$ python solution_2a.py json_files/cfg.json name
['ae1.185', 'v185', 'ae47.128', 'v128', 'ae1.139', 'v139', 'ae1.140', 'v140', 'User1', 'User2', 'User3', 'ge-0/0/0', '192.168.1.1/29', 11, '10.1.1.1/29', 'ge-0/0/1', '192.168.199.1/30']

$ python solution_2a.py json_files/cfg.json user
[
    [
        {'authentication': {'encrypted-password': 'password'}, 'class': 'super-user', 'name': 'User1', 'uid': 1000},
        {'authentication': {'encrypted-password': 'password'}, 'class': 'super-user', 'name': 'User2', 'uid': 2001},
        {'authentication': {'encrypted-password': 'password'}, 'class': 'super-user', 'name': 'User3', 'uid': 2002}
    ]
]

$ python solution_2a.py json_files/cfg.json user name
['User1', 'User2', 'User3']

Q&A 4 Collect Port Status Information

English translation

Задача собрать информацию о статусе портов на оборудовании (up/down/admin down для Cisco IOS). На первом этапе собирается информация о всех портах (Loopback/физические/Tunnel/...) и их статусе. На втором этапе из собраной информации надо отобрать только физические порты. И на третьем сохранять информацию о статусе портов и добавить возможность сравнивать изменения в статусе портов (текущий статус с последним записанным).

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Natasha Samoylenko
Natasha Samoylenko
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