Add support for port mirroring

[troglobit]

Description

• Mirror destination port (monitor port)
• Mirror source port(s)
• Only do what's easy and already available in kernel, incl. DSA driver
• At least one tuple of (dest, source port(s)).

For syntax, see tc mirred

Note: prepare (emotionally) for CPU as destination port. Coming in second release when we do capture of external traffic to SD card :sunglasses:

CLI Proposal

If no YANG model exists (check first).

• interface X9 monitor 0
• monitor 0
  • source [interfaces]

Limitation: The monitor port is a "choice" so it cannot at the same time be a bridge or lag port.

General Information

Anyone can help out by sponsoring development of new features or contributing pull requests. Please use this issue for discussions related to the feature.