I got a two link MLPPP Bundle consisting of two serial microwave links. Both links are 1536Kbps(3072 total). Is it recommended to have fragmentation on or off?
Fragmentation allows the oversized packets to be transmited over the interface. So, keep it enabled.
If I remember it correctly, LFI is not required on interface with AR 1536k bps or higher. 1536 kbps in 10 ms roughly equates to 1600 bytes.
Here's the official link: