Due diligence is dull! Capturing before & after outputs when performing changes, then running a diff to spot possible issues is time consuming. So I made a tool that's easily extendable to do the legwork for me.
It connects via SSH to a specified list of network devices, automatically detects the platform & runs platform specific commands. Features additional role specific checks based on partial hostnames, optional ping sweep (pulls interface IP addresses via SNMP) & VRF aware BGP peer routes check. HTML post checks report with command output diffs is emailed out to specified email address as a zip file attachment. Each SSH session to a device is handled in a separate thread, for reduced execution times when running against multiple devices.
The first run of the tool will create a directory in the temporary files path, named after the change control ID. The output of the pre-checks will be stored as text files in this directory.
The second run of the tool will store the outputs of the post-checks in this directory, run a diff against the pre & post checks, generate an HTML report & send an email with it attached as a zip file.
https://github.com/Chris-P-15B/Automated-Pre-and-Post-Checks
Snippet from an example checkout report:
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