Difference between vty lines 0 4 and 5 15 (2024)

Arvind provides an interesting commentary on vty lines. But my interpretation of the original question is a bit different.

In traditional IOS there were 5 lines for vty (line vty 0 4) to support remote access. In recent versions (and perhaps differing by feature set) there are 16 lines vty 0 15. Even if you configure all 16 lines exactly the same (same password, same login properties, same transport protocol, etc) the output of show run/show start will separate lines 0 4 and lines 5 15. I assume this is some legacy effect in the parser and does not have any operational impact.

HTH

Rick