Thank you Karstenl for sharing this.   I particularly like Option 6: Two MX, two ISPs (4), which ensures that there is a backup for each component (FAI, Switch and MX)     Pros: - redundancy and reliability. - minimum single point of failure.   Cons: - Requires physical intervention if a switch fails, as the ISP connection needs to be moved manually from the damaged switch to the working one. - Having two links from the ISP is not common and may not be feasible for all setups.   Despite these potential drawbacks, I believe the added redundancy makes this option the best choice. ... View more