Collection of Sample Scripts to Gather Network Information

hpreston, updated 🕥 2022-12-08 05:06:07

Network Info Scripts Examples

This repository contains a sampling of Python scripts that can be used to gather information from the network using different libraries and tools available to network automation engineers.

Setup a DevNet Sandbox to Use
Jump to the Demos!

Many of these samples started as examples I created during video sessions with David Bombal.

Feel free to use any of the examples you find here as you wish, but I highly suggest testing them out in a lab environment (such as the DevNet Sandbox shown below) before using them in a production network.

If you've any ideas or requests for other samples, feel free to open up an Issue, but there is no SLA or guarantees provided :-)

Operating System and Development Environment Requirements

These scripts and the examples assume you have already setup your laptop with the basic set of dev tools network automation engineers need. If you need some help there, checkout the DevNet Learning Labs on Development Environment Setup

Windows

Some of the Python libraries used in the examples require a Linux environment and won't run natively on Windows. If you are Windows user, you can still run these examples using one of the options here.

Windows Subsystem for Linux
- Method to install a Linux "app" on Windows 10
- I did a video on this with David Bombal you can checkout.
Run the exercises in a Docker Container
- If you are comfortable with Docker and working in a bash terminal, this is a great option.
- I actually have a "DevBox" Container that you can use easily with:
  
  bash docker run -it hpreston/devbox * Use a Linux VM * Many engineers I've talked with have setup a Linux VM on their Windows workstations for this specific need.

Setup a Test Network with DevNet Sandbox

All of the scripts have been built and tested using the DevNet Multi-IOS Sandbox, a free development lab available for anyone to reserve and use. An easy way to try them yourself is to reserve a lab and follow along.

Note: If you have your own VIRL server available, you of course use it instead.

First, reserve a Sandbox and connect to its VPN (details provided in email or in the Sandbox Portal). When reserving, you can pick "None" as the VIRL Simulation as we'll be starting one up momentarily.
We are "network developers" so we'll be using our Python and API skills for these examples. Let's setup a Python3 virtual environment and install the great virlutils library to get our sample network working.

One method of creating a venv is shown here, feel free to use whatever method you prefer and works on your platform.

```bash python3.6 -m venv venv source venv/bin/activate pip install requests virlutils

Due to an version specificity between requests and urllib 3, manually installing requests here

```
Now we can start our network simulation. If you've your own topology file, feel free to use that. Otherwise let's start up one of the samples.

bash virl up virlfiles/5_router_mesh
Monitor the status of the network start with virl commands. For example:

```bash

See the nodes in the simulation

virl nodes

Connect to Console of a node

virl console iosv-1

Connect to SSH

virl ssh iosv-1

See all commands in help

virl --help ```
Some of these examples will leverage Ansible and/or pyATS/Genie within them. virlutils provides an easy way to generate inventory for both from your simulation.

```bash

Create an Ansible Inventory File called inventory.yaml

virl generate ansible -o inventory.yaml

Create a pyATS/Genie Testbed File called testbed.yaml

virl generate pyats -o testbed.yaml ```

Note: Ansible and pyATS/Genie examples require a Linux or macOS environment and won't work on Windows. See above for tips if you're a Windows user.

Running the Demos

Checkout some of the demo's included.

Note: This repo and examples started on May 11th, 2019 and is a work in progress in case you're wondering why so few examples so far :-)

Interface MAC Address Report

Interface MAC Address Report

Let's create a CSV file containing all the MAC addresses for every interface in our network.

Note: This example leverages the Genie library and requires a macOS or Linux environment.

Libraries Used

genie - To gather network interface details
csv - To write out details to a CSV file

Note: if you'd like to explore this example within an interactive Python environment, checkout interface_report_interactive.py for a walkthrough designed to be used in iPython or another interactive window.

Install the necessary Python libraries into your virtual environment.

bash pip install genie virlutils
- A requirements.txt file is included in the repo with all the libraries used for all examples. You could pip install -r requirements.txt instead.
- csv is included with Python standard library
If you haven't already started your network simulation in VIRL and created the testbed file, do that now.

bash virl up --provision virlfiles/5_router_mesh virl generate pyats -o testbed.yaml
Genie will need the network credentials to connect to the devices. The virlutils generated testbed file assumes you will have set Environment Variables for PYATS_USERNAME, PYATS_PASSWORD and PYATS_AUTH_PASS.

```yaml

from testbed.yaml file

testbed:
name: network_info tacacs: username: "%ENV{PYATS_USERNAME}" passwords: tacacs: "%ENV{PYATS_PASSWORD}" enable: "%ENV{PYATS_AUTH_PASS}" line: "%ENV{PYATS_PASSWORD}" ```
VIRL defaults to cisco for all of these. This repository has a src_env file included that will set up these environment variables. Just "source" it.

bash source src_env
Run the script to generate the report.

python interface_report.py
- While this script runs, you'll see output in your terminal of Genie connecting to each device and running the commands to gather info.
- It will take a minute or two to complete.
Take a look at interfaces.csv file to see the data. Here I'll use less, but you can leverage Excel or any other program you wish.

```bash less interfaces.csv

Partial sample output

Device,Interface,MAC Address iosv-1,GigabitEthernet0/0,5e00.8000.0000 iosv-1,GigabitEthernet0/1,fa16.3ea0.2e5e iosv-1,GigabitEthernet0/2,fa16.3e01.3226 iosv-1,GigabitEthernet0/3,fa16.3ecc.abc5 iosv-1,GigabitEthernet0/4,fa16.3ecd.dc7b iosv-1,Loopback0,N/A iosv-2,GigabitEthernet0/0,5e00.8001.0000 iosv-2,GigabitEthernet0/1,fa16.3e99.d270 iosv-2,GigabitEthernet0/2,fa16.3ee3.4fcf iosv-2,GigabitEthernet0/3,fa16.3e51.be1c iosv-2,GigabitEthernet0/4,fa16.3e05.6cd7 ```

Issues

Bump certifi from 2019.3.9 to 2022.12.7

opened on 2022-12-08 05:06:06 by dependabot[bot]

Bumps certifi from 2019.3.9 to 2022.12.7.

Commits

9e9e840 2022.12.07
b81bdb2 2022.09.24
939a28f 2022.09.14
aca828a 2022.06.15.2
de0eae1 Only use importlib.resources's new files() / Traversable API on Python ≥3.11 ...
b8eb5e9 2022.06.15.1
47fb7ab Fix deprecation warning on Python 3.11 (#199)
b0b48e0 fixes #198 -- update link in license
9d514b4 2022.06.15
4151e88 Add py.typed to MANIFEST.in to package in sdist (#196)
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Bump lxml from 4.3.3 to 4.9.1

opened on 2022-07-06 20:06:37 by dependabot[bot]

Bumps lxml from 4.3.3 to 4.9.1.

Changelog

Sourced from lxml's changelog.

4.9.1 (2022-07-01)

Bugs fixed

A crash was resolved when using iterwalk() (or canonicalize()) after parsing certain incorrect input. Note that iterwalk() can crash on valid input parsed with the same parser after failing to parse the incorrect input.

4.9.0 (2022-06-01)

Bugs fixed

GH#341: The mixin inheritance order in lxml.html was corrected. Patch by xmo-odoo.

Other changes

Built with Cython 0.29.30 to adapt to changes in Python 3.11 and 3.12.

Wheels include zlib 1.2.12, libxml2 2.9.14 and libxslt 1.1.35 (libxml2 2.9.12+ and libxslt 1.1.34 on Windows).

GH#343: Windows-AArch64 build support in Visual Studio. Patch by Steve Dower.

4.8.0 (2022-02-17)

Features added

GH#337: Path-like objects are now supported throughout the API instead of just strings. Patch by Henning Janssen.

The ElementMaker now supports QName values as tags, which always override the default namespace of the factory.

Bugs fixed

GH#338: In lxml.objectify, the XSI float annotation "nan" and "inf" were spelled in lower case, whereas XML Schema datatypes define them as "NaN" and "INF" respectively.

... (truncated)

Commits

d01872c Prevent parse failure in new test from leaking into later test runs.
d65e632 Prepare release of lxml 4.9.1.
86368e9 Fix a crash when incorrect parser input occurs together with usages of iterwa...
50c2764 Delete unused Travis CI config and reference in docs (GH-345)
8f0bf2d Try to speed up the musllinux AArch64 build by splitting the different CPytho...
b9f7074 Remove debug print from test.
b224e0f Try to install 'xz' in wheel builds, if available, since it's now needed to e...
897ebfa Update macOS deployment target version from 10.14 to 10.15 since 10.14 starts...
853c9e9 Prepare release of 4.9.0.
d3f77e6 Add a test for https://bugs.launchpad.net/lxml/+bug/1965070 leaving out the a...
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Bump ipython from 7.5.0 to 7.16.3

opened on 2022-01-21 19:50:44 by dependabot[bot]

Bumps ipython from 7.5.0 to 7.16.3.

Commits

d43c7c7 release 7.16.3
5fa1e40 Merge pull request from GHSA-pq7m-3gw7-gq5x
8df8971 back to dev
9f477b7 release 7.16.2
138f266 bring back release helper from master branch
5aa3634 Merge pull request #13341 from meeseeksmachine/auto-backport-of-pr-13335-on-7...
bcae8e0 Backport PR #13335: What's new 7.16.2
8fcdcd3 Pin Jedi to <0.17.2.
2486838 release 7.16.1
20bdc6f fix conda build
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Bump urllib3 from 1.24.3 to 1.26.5

opened on 2021-06-01 23:42:21 by dependabot[bot]

Bumps urllib3 from 1.24.3 to 1.26.5.

Release notes

Sourced from urllib3's releases.

1.26.5

:warning: IMPORTANT: urllib3 v2.0 will drop support for Python 2: Read more in the v2.0 Roadmap

Fixed deprecation warnings emitted in Python 3.10.

Updated vendored six library to 1.16.0.

Improved performance of URL parser when splitting the authority component.

If you or your organization rely on urllib3 consider supporting us via GitHub Sponsors

1.26.4

:warning: IMPORTANT: urllib3 v2.0 will drop support for Python 2: Read more in the v2.0 Roadmap

Changed behavior of the default SSLContext when connecting to HTTPS proxy during HTTPS requests. The default SSLContext now sets check_hostname=True.

If you or your organization rely on urllib3 consider supporting us via GitHub Sponsors

1.26.3

:warning: IMPORTANT: urllib3 v2.0 will drop support for Python 2: Read more in the v2.0 Roadmap

Fixed bytes and string comparison issue with headers (Pull #2141)

Changed ProxySchemeUnknown error message to be more actionable if the user supplies a proxy URL without a scheme (Pull #2107)

If you or your organization rely on urllib3 consider supporting us via GitHub Sponsors

1.26.2

:warning: IMPORTANT: urllib3 v2.0 will drop support for Python 2: Read more in the v2.0 Roadmap

Fixed an issue where wrap_socket and CERT_REQUIRED wouldn't be imported properly on Python 2.7.8 and earlier (Pull #2052)

1.26.1

:warning: IMPORTANT: urllib3 v2.0 will drop support for Python 2: Read more in the v2.0 Roadmap

Fixed an issue where two User-Agent headers would be sent if a User-Agent header key is passed as bytes (Pull #2047)

1.26.0

:warning: IMPORTANT: urllib3 v2.0 will drop support for Python 2: Read more in the v2.0 Roadmap

Added support for HTTPS proxies contacting HTTPS servers (Pull #1923, Pull #1806)

Deprecated negotiating TLSv1 and TLSv1.1 by default. Users that still wish to use TLS earlier than 1.2 without a deprecation warning should opt-in explicitly by setting ssl_version=ssl.PROTOCOL_TLSv1_1 (Pull #2002) Starting in urllib3 v2.0: Connections that receive a DeprecationWarning will fail

Deprecated Retry options Retry.DEFAULT_METHOD_WHITELIST, Retry.DEFAULT_REDIRECT_HEADERS_BLACKLIST and Retry(method_whitelist=...) in favor of Retry.DEFAULT_ALLOWED_METHODS, Retry.DEFAULT_REMOVE_HEADERS_ON_REDIRECT, and Retry(allowed_methods=...) (Pull #2000) Starting in urllib3 v2.0: Deprecated options will be removed

... (truncated)

Changelog

Sourced from urllib3's changelog.

1.26.5 (2021-05-26)

Fixed deprecation warnings emitted in Python 3.10.

Updated vendored six library to 1.16.0.

Improved performance of URL parser when splitting the authority component.

1.26.4 (2021-03-15)

Changed behavior of the default SSLContext when connecting to HTTPS proxy during HTTPS requests. The default SSLContext now sets check_hostname=True.

1.26.3 (2021-01-26)

Fixed bytes and string comparison issue with headers (Pull #2141)

Changed ProxySchemeUnknown error message to be more actionable if the user supplies a proxy URL without a scheme. (Pull #2107)

1.26.2 (2020-11-12)

Fixed an issue where wrap_socket and CERT_REQUIRED wouldn't be imported properly on Python 2.7.8 and earlier (Pull #2052)

1.26.1 (2020-11-11)

Fixed an issue where two User-Agent headers would be sent if a User-Agent header key is passed as bytes (Pull #2047)

1.26.0 (2020-11-10)

NOTE: urllib3 v2.0 will drop support for Python 2. Read more in the v2.0 Roadmap <https://urllib3.readthedocs.io/en/latest/v2-roadmap.html>_.

Added support for HTTPS proxies contacting HTTPS servers (Pull #1923, Pull #1806)

Deprecated negotiating TLSv1 and TLSv1.1 by default. Users that still wish to use TLS earlier than 1.2 without a deprecation warning

... (truncated)

Commits

d161647 Release 1.26.5
2d4a3fe Improve performance of sub-authority splitting in URL
2698537 Update vendored six to 1.16.0
07bed79 Fix deprecation warnings for Python 3.10 ssl module
d725a9b Add Python 3.10 to GitHub Actions
339ad34 Use pytest==6.2.4 on Python 3.10+
f271c9c Apply latest Black formatting
1884878 [1.26] Properly proxy EOF on the SSLTransport test suite
a891304 Release 1.26.4
8d65ea1 Merge pull request from GHSA-5phf-pp7p-vc2r
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Bump pygments from 2.4.0 to 2.7.4

opened on 2021-03-29 19:31:43 by dependabot[bot]

Bumps pygments from 2.4.0 to 2.7.4.

Release notes

Sourced from pygments's releases.

2.7.4

Updated lexers:

Apache configurations: Improve handling of malformed tags (#1656)

CSS: Add support for variables (#1633, #1666)

Crystal (#1650, #1670)

Coq (#1648)

Fortran: Add missing keywords (#1635, #1665)

Ini (#1624)

JavaScript and variants (#1647 -- missing regex flags, #1651)

Markdown (#1623, #1617)

Shell

Lex trailing whitespace as part of the prompt (#1645)

Add missing in keyword (#1652)

SQL - Fix keywords (#1668)

Typescript: Fix incorrect punctuation handling (#1510, #1511)

Fix infinite loop in SML lexer (#1625)

Fix backtracking string regexes in JavaScript/TypeScript, Modula2 and many other lexers (#1637)

Limit recursion with nesting Ruby heredocs (#1638)

Fix a few inefficient regexes for guessing lexers

Fix the raw token lexer handling of Unicode (#1616)

Revert a private API change in the HTML formatter (#1655) -- please note that private APIs remain subject to change!

Fix several exponential/cubic-complexity regexes found by Ben Caller/Doyensec (#1675)

Fix incorrect MATLAB example (#1582)

Thanks to Google's OSS-Fuzz project for finding many of these bugs.

2.7.3

Updated lexers:

Ada (#1581)

HTML (#1615, #1614)

Java (#1594, #1586)

JavaScript (#1605, #1589, #1588)

JSON (#1569 -- this is a complete rewrite)

Lean (#1601)

LLVM (#1612)

Mason (#1592)

MySQL (#1555, #1551)

Rust (#1608)

Turtle (#1590, #1553)

Deprecated JsonBareObjectLexer, which is now identical to JsonLexer (#1600)

The ImgFormatter now calculates the exact character width, which fixes some issues with overlapping text (#1213, #1611)

... (truncated)

Changelog

Sourced from pygments's changelog.

Version 2.7.4

(released January 12, 2021)

Updated lexers:

Apache configurations: Improve handling of malformed tags (#1656)

CSS: Add support for variables (#1633, #1666)

Crystal (#1650, #1670)

Coq (#1648)

Fortran: Add missing keywords (#1635, #1665)

Ini (#1624)

JavaScript and variants (#1647 -- missing regex flags, #1651)

Markdown (#1623, #1617)

Shell

Lex trailing whitespace as part of the prompt (#1645)

Add missing in keyword (#1652)

SQL - Fix keywords (#1668)

Typescript: Fix incorrect punctuation handling (#1510, #1511)

Fix infinite loop in SML lexer (#1625)

Fix backtracking string regexes in JavaScript/TypeScript, Modula2 and many other lexers (#1637)

Limit recursion with nesting Ruby heredocs (#1638)

Fix a few inefficient regexes for guessing lexers

Fix the raw token lexer handling of Unicode (#1616)

Revert a private API change in the HTML formatter (#1655) -- please note that private APIs remain subject to change!

Fix several exponential/cubic-complexity regexes found by Ben Caller/Doyensec (#1675)

Fix incorrect MATLAB example (#1582)

Thanks to Google's OSS-Fuzz project for finding many of these bugs.

Version 2.7.3

(released December 6, 2020)

Updated lexers:

Ada (#1581)

HTML (#1615, #1614)

Java (#1594, #1586)

JavaScript (#1605, #1589, #1588)

JSON (#1569 -- this is a complete rewrite)

Lean (#1601)

LLVM (#1612)

Mason (#1592)

... (truncated)

Commits

4d555d0 Bump version to 2.7.4.
fc3b05d Update CHANGES.
ad21935 Revert "Added dracula theme style (#1636)"
e411506 Prepare for 2.7.4 release.
275e34d doc: remove Perl 6 ref
2e7e8c4 Fix several exponential/cubic complexity regexes found by Ben Caller/Doyensec
eb39c43 xquery: fix pop from empty stack
2738778 fix coding style in test_analyzer_lexer
02e0f09 Added 'ERROR STOP' to fortran.py keywords. (#1665)
c83fe48 support added for css variables (#1633)
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Bump pyyaml from 5.1 to 5.4

opened on 2021-03-25 22:37:21 by dependabot[bot]

Bumps pyyaml from 5.1 to 5.4.

Changelog

Sourced from pyyaml's changelog.

5.4 (2021-01-19)

yaml/pyyaml#407 -- Build modernization, remove distutils, fix metadata, build wheels, CI to GHA

yaml/pyyaml#472 -- Fix for CVE-2020-14343, moves arbitrary python tags to UnsafeLoader

yaml/pyyaml#441 -- Fix memory leak in implicit resolver setup

yaml/pyyaml#392 -- Fix py2 copy support for timezone objects

yaml/pyyaml#378 -- Fix compatibility with Jython

5.3.1 (2020-03-18)

yaml/pyyaml#386 -- Prevents arbitrary code execution during python/object/new constructor

5.3 (2020-01-06)

yaml/pyyaml#290 -- Use is instead of equality for comparing with None

yaml/pyyaml#270 -- Fix typos and stylistic nit

yaml/pyyaml#309 -- Fix up small typo

yaml/pyyaml#161 -- Fix handling of slots

yaml/pyyaml#358 -- Allow calling add_multi_constructor with None

yaml/pyyaml#285 -- Add use of safe_load() function in README

yaml/pyyaml#351 -- Fix reader for Unicode code points over 0xFFFF

yaml/pyyaml#360 -- Enable certain unicode tests when maxunicode not > 0xffff

yaml/pyyaml#359 -- Use full_load in yaml-highlight example

yaml/pyyaml#244 -- Document that PyYAML is implemented with Cython

yaml/pyyaml#329 -- Fix for Python 3.10

yaml/pyyaml#310 -- Increase size of index, line, and column fields

yaml/pyyaml#260 -- Remove some unused imports

yaml/pyyaml#163 -- Create timezone-aware datetimes when parsed as such

yaml/pyyaml#363 -- Add tests for timezone

5.2 (2019-12-02)

Repair incompatibilities introduced with 5.1. The default Loader was changed, but several methods like add_constructor still used the old default yaml/pyyaml#279 -- A more flexible fix for custom tag constructors yaml/pyyaml#287 -- Change default loader for yaml.add_constructor yaml/pyyaml#305 -- Change default loader for add_implicit_resolver, add_path_resolver

Make FullLoader safer by removing python/object/apply from the default FullLoader yaml/pyyaml#347 -- Move constructor for object/apply to UnsafeConstructor

Fix bug introduced in 5.1 where quoting went wrong on systems with sys.maxunicode <= 0xffff yaml/pyyaml#276 -- Fix logic for quoting special characters

Other PRs: yaml/pyyaml#280 -- Update CHANGES for 5.1

5.1.2 (2019-07-30)

Re-release of 5.1 with regenerated Cython sources to build properly for Python 3.8b2+

... (truncated)

Commits

58d0cb7 5.4 release
a60f7a1 Fix compatibility with Jython
ee98abd Run CI on PR base branch changes
ddf2033 constructor.timezone: _copy & deepcopy
fc914d5 Avoid repeatedly appending to yaml_implicit_resolvers
a001f27 Fix for CVE-2020-14343
fe15062 Add 3.9 to appveyor file for completeness sake
1e1c7fb Add a newline character to end of pyproject.toml
0b6b7d6 Start sentences and phrases for capital letters
c976915 Shell code improvements
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Hank Preston

GitHub Repository

Collection of Sample Scripts to Gather Network Information

Network Info Scripts Examples

Operating System and Development Environment Requirements

Windows

Setup a Test Network with DevNet Sandbox

Due to an version specificity between requests and urllib 3, manually installing requests here

See the nodes in the simulation

Connect to Console of a node

Connect to SSH

See all commands in help

Create an Ansible Inventory File called inventory.yaml

Create a pyATS/Genie Testbed File called testbed.yaml

Running the Demos

Interface MAC Address Report

from testbed.yaml file

Partial sample output

Issues

Bump certifi from 2019.3.9 to 2022.12.7

Bump lxml from 4.3.3 to 4.9.1

4.9.1 (2022-07-01)

Bugs fixed

4.9.0 (2022-06-01)

Bugs fixed

Other changes

4.8.0 (2022-02-17)

Features added

Bugs fixed

Bump ipython from 7.5.0 to 7.16.3

Bump urllib3 from 1.24.3 to 1.26.5

1.26.5

1.26.4

1.26.3

1.26.2

1.26.1

1.26.0

1.26.5 (2021-05-26)

1.26.4 (2021-03-15)

1.26.3 (2021-01-26)

1.26.2 (2020-11-12)

1.26.1 (2020-11-11)

1.26.0 (2020-11-10)

Bump pygments from 2.4.0 to 2.7.4

2.7.4

2.7.3

Version 2.7.4

Version 2.7.3

Bump pyyaml from 5.1 to 5.4

5.2 (2019-12-02)

5.1.2 (2019-07-30)

Hank Preston